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Total result(s) found: 150
  • MAPbI3 Single Crystals Free from Hole-Trapping Centers for Enhanced Photodetectivity​
    Chen Yang, Jehad K. El-Demellawi, Jun Yin, Dhinesh Babu Velusamy, Abdul-Hamid M. Emwas, Ahmed M. El-Zohry, Issam Gereige, Ahmed AlSaggaf, Osman M. Bakr, Husam N. Alshareef, Omar F. Mohammed​
    ACS Energy Lett. 2019, 4, 2579−2584
Keywords:
Enhanced Photodetectivity
  • Tuning Hot Carrier Cooling Dynamics by Dielectric Confinement in Two-Dimensional Hybrid Perovskite Crystals
    Jun Yin, Partha Maity, Rounak Naphade, Bin Cheng, Jr-Hau He, Osman M. Bakr, Jean-Luc Brédas, Omar F. Mohammed
    ACS Nano, 2019
Keywords:
2D hybrid perovskites, dielectric confinement, hot carrier cooling, nonadiabatic molecular dynamics, electron−phonon coupling
  • [Cu61(StBu)26S6Cl6H14]+: A Core–Shell Superatom Nanocluster with a Quasi-J36 Cu19 Core and an “18-Crown-6” Metal-Sulfide-like Stabilizing Belt
    Atanu GhoshAtanu Ghosh, Ren-Wu Huang, Badriah Alamer, Edy Abou-Hamad, Mohamed Nejib Hedhili, Omar F. Mohammed, Osman M. Bakr
    ACS Materials Lett.2019, 1, 3, 297-302
Keywords:
Quasi-J36 Cu19 Core
  • Metal Halide Perovskite and Phosphorus Doped g-C3N4 Bulk Heterojunctions for Air-Stable Photodetectors
    Zhixiong Liu, Yunpei Zhu, Jehad K. El-Demellawi, Dhinesh Babu Velusamy, Ahmed M. El-Zohry, Osman M. Bakr, Omar F. Mohammed, Husam N. Alshareef
    ACS Energy Lett.
Keywords:
Metal Halide Perovskite
  • Layer-Dependent Coherent Acoustic Phonons in Two-Dimensional Ruddlesden–Popper Perovskite Crystals
    Partha Maity, Jun Yin, Bin Cheng, Jr-Hau He, Osman M. Bakr, Omar F. Mohammed
    J. Phys. Chem. Lett.201910175259-5264
Keywords:
Layer-Dependent Coherent Acoustic Phonons
  • Pillar[5]arene Stabilized Silver Nanoclusters: Immense Stability and Luminescence Enhancement Induced by Host‐Guest Interactions
    Madathumpady Muhammed, laila cruz, Abdul‐Hamid Emwas, Ahmed El-Zohry, Basem Moosa, Omar Mohammed, Niveen Khashab
    Angewandte Chemie
Keywords:
nano clusters, pillararene, Host-guest chemistry, Molecular recognition, sensors
  • MXenes for Plasmonic Photodetection
    Dhinesh Babu Velusamy, Jehad K. El‐Demellawi, Ahmed M. El‐Zohry, Andrea Giugni, Sergei Lopatin, Mohamed N. Hedhili, Ahmed E. Mansour, Enzo Di Fabrizio, Omar F. Mohammed, Husam N. Alshareef
    Adv.Mater.2019, 1807658
Keywords:
flexible photodetectors, low‐frequency Raman spectroscopy, molybdenum carbide, MXenes, surface plasmons
  • Defect-Triggered Phase Transition in Cesium Lead Halide Perovskite Nanocrystals
    Ju-Ping Ma, Jun Yin, Ya-Meng Chen, Qing Zhao, Yang Zhou, Hong Li, Yoshihiro Kuroiwa, Chikako Moriyoshi, Zhi-Yong Li, Osman M. Bakr, Omar F. Mohammed, Hong-Tao Sun
    ACS Materials Lett. 2019, 1, 185−191
Keywords:
NCs, CsPbCl3 NCs
  • Emergence of multiple fluorophores in individual cesium lead bromide nanocrystals
    Yuhai Zhang, Tianle Guo, Haoze Yang, Riya Bose, Lingmei Liu, Jun Yin, Yu Han, Osman M. Bakr, Omar F. Mohammed, Anton V. Malko 
    Nature Communicationsvolume 10, Article number: 2930 (2019)
Keywords:
multiple fluorophores
  • Controllable Charge-Transfer Mechanism at Push–Pull Porphyrin/Nanocarbon Interfaces
    Pınar Arpaçay, Partha Maity, Ahmed M. El-Zohry, Alina Meindl, Sevilay Akca, Shane Plunkett, Mathias O. Senge, Werner J. Blau, Omar F. Mohammed
    J. Phys. Chem. C
Keywords:
Push–pull porphyrins, Push–Pull Porphyrin/Nanocarbon Interfaces
  • Quantum Dots Supply Bulk- and Surface-Passivation Agents for Efficient and Stable Perovskite Solar Cells
    Xiaopeng Zheng, Joel Troughton, Nicola Gasparini, Yuanbao Lin, Mingyang Wei, Yi Hou, Jiakai Liu, Kepeng Song, Zhaolai Chen, Chen Yang, Bekir Turedi, Abdullah Y. Alsalloum, Jun Pan, Jie Chen, Ayan A. Zhumekenov, Thomas D.Anthopoulos, Yu Han, Derya Baran, Omar F. Mohammed, Edward H. Sargent, Osman M.Bakr
    Zheng et al., Joule3,1–14
Keywords:
quantum dots, nanocrystals, doping, surface modification, perovskite solar cells, stability, self-assembled monolayer
  • Assembly of Atomically Precise Silver Nanoclusters into Nanocluster-based Frameworks
    Mohammad J. Alhilaly, Ren-Wu Huang, Rounak Naphade, Badriah Alamer, Mohamed Nejib Hedhili, Abdul-Hamid Emwas, Partha Maity, Jun Yin, Aleksander Shkurenko, Omar F. Mohammed, Mohamed Eddaoudi, Osman M. Bakr
    J. Am. Chem. Soc.
Keywords:
Nanocluster-based Frameworks
  • Tuning Solute‐Redistribution Dynamics for Scalable Fabrication of Colloidal Quantum‐Dot Optoelectronics
    Min‐Jae Choi, YongJoo Kim, Hunhee Lim, Erkki Alarousu, Aniruddha Adhikari, Basamat S. Shaheen, Yong Ho Kim, Omar F. Mohammed, Edward. H. Sargent, Jin Young Kim, Yeon Sik Jung
    Adv.Mater.2019, 1805886
Keywords:
colloidal quantums dot, large‐area solar cells, solute redistribution
  • Why are Hot Holes Easier to Extract than Hot Electrons from Methylammonium Lead Iodide Perovskite?
    Ibrahim Dursun, Partha Maity, Jun Yin, Bekir Turedi, Ayan A. Zhumekenov, Kwang Jae Lee, Omar F. Mohammed, Osman M. Bakr
    Adv. Energy Mater. 2019, 1900084
Keywords:
carrier extraction, carrier temperature, density functional theory, halide perovskites, hot carriers
  • Unprecedented Ultralow Detection Limit of Amines using a Thiadiazole-Functionalized Zr(IV)-Based Metal–Organic Framework
    Arijit Mallick, Ahmed M. El-Zohry, Osama Shekhah, Jun Yin, Jiangtao Jia, Himanshu Aggarwal, Abdul-Hamid Emwas, Omar F. Mohammed, Mohamed Eddaoudi
    J. Am. Chem. Soc., 2019, 141 (18), pp 7245–7249
Keywords:
amines, density functional theory
  • Compositionally Screened Eutectic Catalytic Coatings on Halide Perovskite Photocathodes for Photoassisted Selective CO2 Reduction
    Jie Chen, Jun Yin, Xiaopeng Zheng, Hassan Ait Ahsaine, Yang Zhou, Chunwei Dong, Omar F. Mohammed, Kazuhiro Takanabe, Osman M. Bakr
    ACS Energy Lett., 2019, 4, pp 1279–1286
Keywords:
Selective CO2 reduction, photoelectrocatalytic
  • Compositional, Processing, and Interfacial Engineering of Nanocrystal- and Quantum-Dot-Based Perovskite Solar Cells
    Ala’a O. El-Ballouli, Osman M. Bakr,Omar F. Mohammed 
    Chem. Mater.
Keywords:
​Perovskite solar cells
  • Visualization of Charge Carrier Trapping in Silicon at the Atomic Surface Level Using Four-Dimensional Electron Imaging
    Basamat S. Shaheen, Ahmed M. El-Zohry, Jun Yin, Michele De Bastiani, Stefaan De Wolf, Osman M. Bakr,Omar F. Mohammed
    J. Phys. Chem. Lett., 2019, 10 (8), pp 1960–1966
Keywords:
charge carrier, four-dimensional electron imaging
  • Perovskite-Based Artificial Multiple Quantum Wells
    Kwang Jae Lee, Bekir Turedi, Lutfan Sinatra, Ayan A. Zhumekenov, Partha Maity, Ibrahim Dursun, Rounak Naphade, Noor Merdad, Abdullah Alsalloum, Semi Oh, Nimer Wehbe, Mohamed N. Hedhili, Chun Hong Kang, Ram Chandra Subedi, Namchul Cho, Jin Soo Kim○, Boon S. Ooi, Omar F. Mohammed, Osman M. Bakr​
    Nano Lett.
Keywords:
bandgap engineering, CsPbBr3, femtosecond spectroscopy, hot carrier, Perovskite, quantum well
  • Reducing Defects in Halide Perovskite Nanocrystals for Light-Emitting Applications
    Xiaopeng Zheng, Yi Hou, Hong-Tao Sun, Omar F. Mohammed, Edward H. Sargent, Osman M. Bakr
    J. Phys. Chem. Lett., 2019, 10 (10), pp 2629–2640
Keywords:
nanocrystals, Light-Emitting
  • Single-Crystal MAPbI3 Perovskite Solar Cells Exceeding 21% Power Conversion Efficiency
    Zhaolai Chen, Bekir Turedi, Abdullah Y. Alsalloum, Chen Yang, Xiaopeng Zheng, Issam Gereige, Ahmed AlSaggaf, Omar F. Mohammed, Osman M. Bakr
    ACS Energy Lett., 2019, 4, pp 1258–1259
Keywords:
Single-Crystal MAPbI3 Perovskite Solar Cells
  • Tunable Twisting Motion of Organic Linkers via Concentration and Hydrogen-Bond Formation​
    Ahmed M. El-Zohry, Abdullah Alturki, Jun Yin, Arijit Mallick, Osama Shekhah, Mohamed Eddaoudi, Boon S. Ooi, Omar F. Mohammed​
    J. Phys. Chem. C​
Keywords:
Tunable Twisting Motion, Organic Linkers
  • Unlocking the Effect of Trivalent Metal Doping in All-Inorganic CsPbBr3 Perovskite​
    Jun Yin, Ghada H. Ahmed, Osman M. Bakr, Jean-Luc Brédas, Omar F. Mohammed​
    ACS Energy Lett.​
Keywords:
Trivalent Metal, Metal-ion doping
  • Reduced ion migration and enhanced photoresponse in cuboid crystals of methylammonium lead iodide perovskite
    Ayan A Zhumekenov, Md Azimul Haque, Jun Yin, Ahmed M El-Zohry, Kwang Jae Lee, Ibrahim Dursun, Omar F Mohammed, Derya Baran, Osman M Bakr
    J. Phys. D: Appl. Phys. 52 (2019) 054001 (8pp)
Keywords:
Reduced ion migration, enhanced photoresponse, iodide perovskite
  • Tellurium-Based Double Perovskites A2TeX6 with Tunable Band Gap and Long Carrier Diffusion Length for Optoelectronic Applications
    Dianxing Ju, Xiaopeng Zheng, Jun Yin, Zhiwen Qiu, Bekir Türedi, Xiaolong Liu, Yangyang Dang, Bingqiang Cao, Omar F. Mohammed, Osman M. Bakr, Xutang Tao
    ACS Energy Lett., 2019, 4 (1), pp 228–234
Keywords:
Tunable Band Gap, Long Carrier Diffusion Length
  • Metal Halide Perovskite Nanosheet for X-Ray High-Resolution Scintillation-Imaging Screens
    Yuhai Zhang, Ruijia Sun, Xiangyu Ou, Kaifang Fu, Qiushui Chen, Yuchong Ding, Liang-Jin Xu, Lingmei Liu, Yu Han, Anton V. Malko, Xiaogang Liu, Huanghao Yang, Osman M. Bakr, Hong Liu, Omar F. Mohammed
    ACS Nano
Keywords:
perovskite, colloidal scintillator, self-assembly, X-ray imaging, energy transfer, nanosheets
  • Extraordinary Carrier Diffusion on CdTe Surfaces Uncovered by 4D Electron Microscopy​
    Ahmed M.El-Zohry, Basamat S.Shaheen, Victor M.Burlakov, Jun Yin, Mohamed N.Hedhili, Semen Shikin, Boon Ooi, Osman M.Bakr, Omar F.Mohammed​
    Chem5, 1–13, March 14, 2019
Keywords:
ultrafast electron imaging, crystal orientation, surface dynamics, renewable energy materials, oxidation layers, neat-surfaces, DFT calculations, Real-space imaging, Surface termination
  • Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics​
    Bin Cheng, Ting-You Li, Partha Maity, Pai-Chun Wei, Dennis Nordlund, Kang-Ting Ho, Der-Hsien Lien, Chun-Ho Lin, Ru-Ze Liang, Xiaohe Miao, Idris A. Ajia, Jun Yin, Dimosthenis Sokaras, Ali Javey, Iman S. Roqan, Omar F. Mohammed, Jr-Hau He​
    Communications Physicsvolume 1, Article number: 80 (2018)
Keywords:
two-dimensional hybrid perovskites
  • Atomic-Level Doping of Metal Clusters
    Atanu Ghosh, Omar F. Mohammed, Osman M. Bakr
    Acc. Chem. Res., 2018, 51 (12), pp 3094–3103
Keywords:
Atomically precise noble metal nanoclusters
  • Layer-edge device of two-dimensional hybrid perovskites
    Bin Cheng, Ting-You Li, Pai-Chun Wei, Jun Yin, Kang-Ting Ho, José Ramón Durán Retamal, Omar F. Mohammed, Jr-Hau He
    Nature Communications 9, Article number: 5196 (2018)
Keywords:
2D perovskites
  • Reversible Band Gap Narrowing of Sn‐based Hybrid Perovskite Single Crystal with Excellent Phase Stability
    Dianxing Ju, Xiaopeng Zheng, Jialiang Liu, Yan Chen, Jian Zhang, Bingqiang Cao, Hang Xiao, Omar F. Mohammed, Osman M. Bakr, Xutang Tao
    Angew. Chem. 2018, 130, 1–6
Keywords:
Bandlückenverengung, Bleifreie, Perowskite, Optoelektronische Eigenschaften, Phasenstabilität
  • Surface Effect on 2D Hybrid Perovskite Crystals: Perovskites Using an Ethanolamine Organic Layer as an Example​
    Kang‐Ting Ho, Siu‐Fung Leung, Ting‐You Li, Partha Maity, Bin Cheng, Hui‐Chun Fu, Omar F. Mohammed, Jr‐Hau He
    Adv. Mater. 2018, 1804372​
Keywords:
2D materials, moisture stability, optoelectronics, perovskites, surface effect
  • Layer-Dependent Rashba Band Splitting in 2D Hybrid Perovskites
    Jun Yin, Partha Maity, Liangjin Xu, Ahmed M. El-Zohry, Hong Li, Osman M. Bakr, Jean-Luc Brédas, Omar F. Mohammed
    Chemistry of Materials
Keywords:
Layer-Dependent Rashba Band, 2D Hybrid Perovskites
  • Point Defects and Green Emission in Zero-Dimensional Perovskites​
    Jun Yin, Haoze Yang, Kepeng Song, Ahmed M. El-Zohry, Yu Han, Osman M. Bakr, Jean-Luc Brédas, Omar F. Mohammed​
    J. Phys. Chem. Lett., 2018, 9, pp 5490–5495​​
Keywords:
Point Defects, Green Emission
  • Halogen Migration in Hybrid Perovskites: The Organic Cation Matters​
    Aleksandra Oranskaia, Jun Yin, Osman M. Bakr, Jean-Luc Brédas, Omar F. Mohammed​
    J. Phys. Chem. Lett., 2018, 9, pp 5474–5480​
Keywords:
Halogen Migration, Organic Cation Matters
  • Giant Photoluminescence Enhancement in CsPbCl3 Perovskite Nanocrystals by Simultaneous Dual-Surface Passivation
    Ghada H. Ahmed, Jehad K. El-Demellawi, Jun Yin, Jun Pan, Dhinesh Babu Velusamy, Mohamed Nejib Hedhili, Erkki Alarousu, Osman M. Bakr, Husam N. Alshareef, Omar F. Mohammed
    ACS Energy Lett., 2018, 3, pp 2301–2307
Keywords:
CsPbCl3 Perovskite Nanocrystals, Simultaneous Dual-Surface Passivation
  • All-inorganic perovskite nanocrystal scintillators​​​​​
    Qiushui Chen, Jing Wu, Xiangyu Ou, Bolong Huang, Jawaher Almutlaq, Ayan A. Zhumekenov, Xinwei Guan, Sanyang Han, Liangliang Liang, Zhigao Yi, Juan Li, Xiaoji Xie, Yu Wang, Ying Li, Dianyuan Fan, Daniel B. L. Teh, Angelo H. All, Omar F. Mohammed, Osman M. Bakr, Tom Wu, Marco Bettinelli, Huanghao Yang, Wei Huang, Xiaogang Liu​
    Naturevolume 561, pages88–93 (2018)​​
Keywords:
Materials for devices, Nanoparticles, Quantum dots, X-rays
  • Tunable Multipolar Surface Plasmons in 2D Ti3C2Tx MXene Flakes
    J.K. El-Demellawi, S. Lopatin, J. Yin, O.F. Mohammed, H.N. Alshareef
    ACS Nano, Article ASAP​
Keywords:
in situ heating STEM; independent polarizability; low-loss/core-loss EELS; surface plasmon blue-shift; temperature-dependent STEM-EELS
  • Scanning ultrafast electron microscopy: Four-dimensional imaging of materials dynamics in space and time
    D.-S. Yang, B. Liao, O.F. Mohammed
    MRS Bulletin, Volume 43, Issue 7 (Ultrafast Imaging of Materials Dynamics), pp. 491-496
Keywords:
field emission, scanning electron microscopy (SEM) nanostructure, photovoltaic, optoelectronic
  • Intramolecular Energy and Electron Transfers in Bodipy-Naphthalenediimide Triads
    Mushraf Hussain, Ahmed M. El-Zohry, Habtom B. Gobeze, Jianzhang Zhao, Francis D'Souza, Omar F. Mohammed
    The Journal of Physical Chemistry A
Keywords:
Förster Resonance Energy Transfer
  • Efficient Photon Recycling and Radiation Trapping in Cesium Lead Halide Perovskite Waveguides
    Ibrahim Dursun, Yangzi Zheng, Tianle Guo, Michele De Bastiani, Bekir Turedi, Lutfan Sinatra, Md Azimul Haque, Bin Sun, Ayan A. Zhumekenov, Makhsud I. Saidaminov, F. Pelayo García de Arquer, Edward H. Sargent, Tom Wu, Yuri N. Gartstein, Osman M. Bakr, Omar F. Mohammed, Anton V. Malko
    ACS Energy Letters, 2018, 3, pp 1492–1498
Keywords:
Photon recycling, Perovskites
  • Imaging the Reduction of Electron Trap States in Shelled Copper Indium Gallium Selenide Nanocrystals Using Ultrafast Electron Microscopy
    Gabriele Meizyte, Riya Bose, Aniruddha Adhikari, Jun Yin, Md Azimul Haque, Manas R. Parida, Mohamed N. Hedhili, Tom Wu, Osman M. Bakr, Omar F. Mohammed
    The Journal of Physical Chemistry
Keywords:
CIGSe
  • The Benefit and Challenges of Zero-Dimensional Perovskites
    Jawaher M. Almutlaq, Jun Yin, Omar F. Mohammed, Osman M. Bakr
    The Journal of Physical Chemistry Letters​
Keywords:
Perovskite
  • Study of the Bulk Charge Carrier Dynamics in Anatase and Rutile TiO2 Single Crystals by Femtosecond Time Resolved Spectroscopy
    Partha Maity, Omar F. Mohammed, Khabiboulakh Katsiev, Hicham Idriss
    J. Phys. Chem. C, Article ASAP 
Keywords:
photocatalysis, renewable energy
  • Solvent-dependent dual fluorescence of the push–pull system 2-diethylamino-7-nitrofluorene
    M. A. B. Larsen, A. B. Stephansen, E. Alarousu, M. Pittelkow, O. F. Mohammed, T. I. Sølling
    Phys. Chem. Chem. Phys., 2018, 20, 5942-5951 
Keywords:
femtosecond transient absorption spectroscopy, apolar solvent cyclohexane, fluorescence
  • On the relationship between rutile/anatase ratio and the nature of defect states in sub-100 nm TiO2nanostructures: experimental insights
    Moamen M. Soliman, Mohamed H. Al Haron, Menna Samir, Sarah A. Tolba, Basamat S. Shaheen, Ahmed W. Amer, Omar F. Mohammed, Nageh K. Allam
    Phys. Chem. Chem. Phys., 2018, 20, 5975-5982​
Keywords:
TiO2, X-Ray Photoelectron Spectroscopy
  • Synthesis and Characterization of Branched fcc/hcp Ruthenium Nanostructures and Their Catalytic Activity in Ammonia Borane Hydrolysis
    Noktan M. Alyami, Alec P. LaGrow, Dalaver H. Anjum, Chao Guan, Xiaohe Miao, Lutfan Sinatra, Ding-Jier Yuan, Omar F.Mohammed, Kuo-Wei Huang, Osman M. Bakr
    Cryst. Growth Des., 2018, 18 (3), pp 1509–1516​
Keywords:
tungsten carbonyl, molybdenum carbonyl, rhenium carbonyl, ruthenium nanoparticles,
  • Water-Induced Dimensionality Reduction in Metal-Halide Perovskites
    Bekir Turedi, Kwangjae Lee, Ibrahim Dursun, Badriah Alamer, Zhennan Wu, Erkki Alarousu, Omar F. Mohammed, Namchul Cho, Osman M. Bakr
    The Journal of Physical Chemistry C
Keywords:
optoelectronic, photoluminescence. synthetic method, 2D perovskite
  • Tailoring the Crystal Structure of Nanoclusters Unveiled High Photoluminescence via Ion Pairing​
    Megalamane S. Bootharaju, Sergey M. Kozlov, Zhen Cao, Aleksander Shkurenko, Ahmed M. El-Zohry, Omar F. Mohammed, Mohamed, Eddaoudi, Osman M. Bakr, Luigi Cavallo, Jean-Marie Basset
    Chemistry of Materials
Keywords:
bimetallic, adamantanethiolate, benzenedithiolate, triphenylphosphine
  • Zeolite-like Metal-organic Framework (MOF) Encaged Pt(II)-porphyrin for Anion-selective Sensing
    Dilshad Masih, Valeriya Chernikova, Osama Shekhah, Mohamed Eddaoudi, Omar F. Mohammed
    J. Phys. Chem. C, 2018, 122 (11), pp 6493–6498
Keywords:
platinum-metallated porphyrin, biosensors
  • Ligand-Free Nanocrystals of Highly Emissive Cs4PbBr6 Perovskite​
    Yuhai Zhang, Lutfan Sinatra, Erkki Alarousu, Jun Yin, Ahmed M. El-Zohry, Osman M. Bakr, Omar F. Mohammed
    J. Phys. Chem. C, 2018, 122 (11), pp 6493–6498​​​​​
Keywords:
perovskite nanocrystals, diode, ligand-free perovskite, ammonium acetate, cesium chloride, nanocrystals, spectroscopy,
  • Imaging Localized Energy States in Silicon-doped InGaN Nanowires Using 4D Electron Microscopy
    R. Bose, A. Adhikari, V.M. Burlakov, G. Liu, M.A. Haque, D. Priante, M.N. Hedhili, N. Wehbe, C. Zhao, H. Yang, T.K. Ng, A. Goriely, O.M. Bakr, T. Wu, B.S. Ooi, O.F. Mohammed
    ACS Energy Letters, 2018
Keywords:
Ultrafast electron microscopy, Nanowires
  • Bidentate Ligand-Passivated CsPbI3 Perovskite Nanocrystals for Stable Near-Unity Photoluminescence Quantum Yield and Efficient Red Light-Emitting Diodes
    J. Pan, Y. Shang, J. Yin, M.D. Bastiani, W. Peng, I. Dursun, L. Sinatra, A.M. El-Zohry, M.N. Hedhili, A.-H. Emwas, O.F. Mohammed, Z. Ning, O.M. Bakr
    J. Am. Chem. Soc., 2018, 140 (2), pp 562–565​
Keywords:
Perovskite, Nanocrystals, Optoelectronics, LED
  • Molecular behavior of zero-dimensional perovskites
    J. Yin, P. Maity, M.D. Bastiani, I. Dursun, O.M. Bakr, J.-L. Brédas, O.F. Mohammed
    Science Advances, 3 (12), e1701793, (2017)
Keywords:
Perovskite, Inorganic
  • Intrinsic Lead Ion Emissions in Zero-Dimensional Cs4PbBr6 Nanocrystals
    J. Yin, Y. Zhang, A. Bruno, C. Soci, O.M. Bakr, J.-L. Brédas, O.F. Mohammed
    ACS Energy Letters, 2, pp 2805–2811
Keywords:
Perovskite, Nanocrystals, Experimental, Theoretical
  • Room-temperature Engineering of All-inorganic Perovskite Nanocrsytals with Different Dimensionalities
    H. Yang, Y. Zhang, J. Pan, J. Yin, O.M. Bakr, O.F. Mohammed
    Chemistry of Materials, 29 (21), pp 8978–8982
Keywords:
Inorganic, Perovskite, Nanocrystals
  • CsPb2Br5 Single Crystals: Synthesis and Characterization
    I. Dursun, M.D. Bastiani, B. Turedi, B. Alamer, A. Shkurenko, J. Yin, A.M. El-Zohry, I. Gereige, A. AlSaggaf, O.F. Mohammed, M. Eddaoudi, O.M. Bakr
    ChemSusChem, 2017, 10 (19), Pages 3746–3749
Keywords:
Halogen perovskites, Indirect band gap, Photoluminescence, Plumbates, Single crystal
  • Direct versus ligand-exchange synthesis of [PtAg28(BDT)12(TPP)4]4− nanoclusters: effect of a single-atom dopant on the optoelectronic and chemical properties
    M.S. Bootharaju, S.M. Kozlov, Z. Cao, M. Harb, M.R. Parida, M.N. Hedhili, O.F. Mohammed, O.M. Bakr, L. Cavallo, J.-M. Basset
    Nanoscale, 9, 9529-9536 , (2017)​
Keywords:
Nanocluster, Optoelectronics
  • Ultralong Radiative States in Hybrid Perovskite Crystals: Compositions for Submillimeter Diffusion Lengths
    E. Alarousu, A.M. El-Zohry, J. Yin, A.A. Zhumekenov, C. Yang, E. Alhabshi, I. Gereige, A. AlSaggaf, A.V. Malko, O.M. Bakr, O.F. Mohammed
    The Journal of Physical Chemistry Letters, 8, pp 43864390, (2017)​
Keywords:
Organic-inorganic, Hybrid, Perovskites
  • Inside Perovskites: Quantum Luminescence from Bulk Cs4PbBr6 Single Crystals
    M.D. Bastiani, I. Dursun, Y. Zhang, B.A. Alshankiti, X.-H. Miao, J. Yin, E. Yengel, E. Alarousu, B. Turedi, J.M. Almutlaq, M.I. Saidaminov, S. Mitra, I. Gereige, A. Alsaggaf, Y. Zhu, Y. Han, I.S. Roqan, J.-L. Bredas, O.F. Mohammed, O.M. Bakr
    Chem. Mater., 201729 (17), pp 7108–7113
Keywords:
perovskite, crystal
  • Homo- or Hetero-Triplet–Triplet Annihilation? A Case Study with Perylene-BODIPY Dyads/Triads
    Xiaoneng Cui, Ahmed M. El-Zohry, Zhijia Wang, Jianzhang Zhao, Omar F. Mohammed
    J. Phys. Chem. C, 2017121 (30), pp 16182–16192
Keywords:
photophysical processes
  • Ultralow Self-Doping in 2D Hybrid Perovskite Single Crystals
    Wei Peng, Jun Yin, Kang-Ting Ho, Olivier Ouellette, Michele De Bastiani, Banavoth Murali, Omar EL TALL, Chao Shen, Xiao-He Miao, Jun Pan, Erkki Alarousu, Jr-Hau He, Boon S. Ooi, Omar F. Mohammed, Edward H. Sargent, Osman M. Bakr
    Nano Lett., 201717 (8), pp 4759–4767
Keywords:
perovskite, single crystals, hybrid
  • Direct-Indirect Nature of the Bandgap in Lead-Free Perovskite Nanocrystals
    Yuhai Zhang, Jun Yin, Manas R. Parida , Ghada H. Ahmed, Jun Pan, Osman M. Bakr , Jean-Luc Brédas, Omar F. Mohammed
    J. Phys. Chem. Lett., 2017, 8, pp 3173–3177
Keywords:
perovskite, nanocrystal
  • Effect of Conjugation Length on Photoinduced Charge Transfer in π-Conjugated Oligomer-Acceptor Dyads
    Junlin Jiang, Amani Alsam, Shanshan Wang, Shawkat M. Aly, Zhenxing Pan, Omar F. Mohammed, Kirk S. Schanze
    J. Phys. Chem. A, 2017121 (26), pp 4891–4901
Keywords:
Photoinduced Charge Transfer
  • Perovskite solar cells: Shedding light on film crystallization
    Osman M. Bakr and Omar F. Mohammed
    Nature Materials 16, 601–602 (2017)
Keywords:
Organic–inorganic nanostructures, Solar cells, Synthesis and processing
  • Spatiotemporal Observation of Electron-Impact Dynamics in Photovoltaic Materials Using 4D Electron Microscopy
    Basamat S. Shaheen, Jingya Sun, Ding-Shyue Yang, and Omar F. Mohammed
    J. Phys. Chem. Lett., 20178, pp 2455–2462
Keywords:
Photovoltaic materials, Surface dynamics, 4D electron microscopy, electron impact dynamics, energy loss, CdSe thin films
  • Thermochromic Perovskite Inks for Reversible Smart Window Applications
    Michele De Bastiani, Makhsud I. Saidaminov, Ibrahim Dursun, Lutfan Sinatra, Wei Peng, Ulrich Buttner, Omar F. Mohammed, Osman M. Bakr
    Chem. Mater., 2017, 29 (8), pp 3367–3370
Keywords:
perovskite, smart window, crystallization
  • Pyridine-induced Dimensionality Change in Hybrid Perovskite Nanocrystals
    Ghada H. Ahmed, Jun Yin, Riya Bose, Lutfan Sinatra, Erkki Alarousu, Emre Yengel, Noktan M. Alyami, Makhsud I. Saidaminov, Yuhai Zhang, Mohamed N. Hedhili, Osman M. Bakr, Jean-Luc Bredas, Omar F. Mohammed
    Chem. Mater., 201729 (10), pp 4393–4400​
Keywords:
nanocrystal growth, pyridine, DFT, nanostructure, optoelectronic
  • Powering up perovskite photoresponse
    Osman M. Bakr, Omar F. Mohammed
    Science Vol. 355, Issue 6331, pp. 1260-1261
Keywords:
2D perovskites, layer-edge states
  • Bane of Hydrogen-Bond Formation on the Photoinduced Charge-Transfer Process in Donor–Acceptor Systems
    Amani A. Alsam, Aniruddha Adhikari, Manas R. Parida, Shawkat M. Aly, Osman M. Bakr, Omar F. Mohammed
    J. Phys. Chem. C, 2017, 121 (14), pp 7837–7843
Keywords:
photoinduced charge transfer, donor–acceptor interfaces, hydrogen-bond
  • Ultrahigh Carrier Mobility Achieved in Photoresponsive Hybrid Perovskite Films via Coupling with Single-Walled Carbon Nanotubes
    Feng Li, Hong Wang, Dominik Kufer, Liangliang Liang, Weili Yu, Erkki Alarousu, Chun Ma, Yangyang Li, Zhixiong Liu, Changxu Liu, Nini Wei, Fei Wang, Lang Chen, Omar F. Mohammed, Andrea Fratalocchi, Xiaogang Liu, Gerasimos Konstantatos, Tom Wu
    Advanced Materials, (2017), Vol. 29, Issue 16
Keywords:
carbon nanotubes; mobility; perovskite; photodetectors; phototransistors
  • 2D Organic–Inorganic Hybrid Thin Films for Flexible UV–Visible Photodetectors
    Dhinesh Babu Velusamy, Md. Azimul Haque, Manas R. Parida, Fan Zhang, Tom Wu, Omar F. Mohammed, Husam N. Alshareef
    Advanced Functional Material, (2017), Vol. 27, Issue 15
Keywords:
2D materials; flexible photodetectors; graphitic carbon nitride; hybrid materials; MoS2
  • Amorphous Tin Oxide as a Low-Temperature-Processed Electron-Transport Layer for Organic and Hybrid Perovskite Solar Cells
    Jérémy Barbé, Max L. Tietze, Marios Neophytou, Banavoth Murali, Erkki Alarousu, Abdulrahman El Labban, Mutalifu Abulikemu, Wan Yue, Omar F. Mohammed, Iain McCulloch, Aram Amassian, Silvano Del Gobbo
    ACS Appl. Mater. Interfaces, 2017, 9 (13), pp 11828–11836​
Keywords:
chemical bath deposition; organic solar cells; perovskite solar cells; tin oxide electron-transport layer; ultraviolet photoelectron spectroscopy
  • Low-Dimensional-Networked Metal Halide Perovskites: The Next Big Thing
    Makhsud I. Saidaminov, Omar F. Mohammed, Osman M. Bakr
    ACS Energy Lett., 2017, 2, pp 889–896
Keywords:
perovskite, low-DN
  • The Surface of Hybrid Perovskite Crystals: A Boon or Bane
    Banavoth Murali, Emre Yengel, Chen Yang, Wei Peng, Erkki Alarousu, Osman M. Bakr, Omar F. Mohammed
    ACS Energy Lett., 2017, 2, pp 846–856​
Keywords:
perovskite, crystals, hybrid perovskite crystal
  • Zero-Dimensional Cs4PbBr6 Perovskite Nanocrystals
    Yuhai Zhang, Makhsud I. Saidaminov, Ibrahim Dursun, Haoze Yang, Banavoth Murali, Erkki Alarousu, Emre Yengel, Buthainah A. Alshankiti, Osman M. Bakr, and Omar F. Mohammed
    J. Phys. Chem. Lett., 2017, 8 (5), pp 961–965 
Keywords:
perovskite, nanocrystal
  • The impact of Au doping on the charge carrier dynamics at the interfaces between cationic porphyrin and silver nanoclusters
    Abdulkhaleq A. Almansaf, Manas R. Parida, Tabot M.D. Besong, Partha Maity, Megalamane S. Bootharaju, Osman M. Bakr, Omar F. Mohammed
    Chemical Physics Letters, In Press, Accepted Manuscript
Keywords:
Interfacial charge transfer; Nanoclusters; Intersystem crossing; Triplet state; Metal ion doping
  • Double Charged Surface Layers in Lead Halide Perovskite Crystals
    Smritakshi P. Sarmah, Victor M. Burlakov, Emre Yengel, Banavoth Murali, Erkki Alarousu, Ahmed M. El-Zohry, Chen Yang, Mohd S. Alias, Ayan A. Zhumekenov, Makhsud I. Saidaminov, Namchul Cho, Nimer Wehbe, Somak Mitra, Idris Ajia, Sukumar Dey, Ahmed E. Mansour, Maged Abdelsamie, Aram Amassian, Iman S. Roqan, Boon S. Ooi, Alain Goriely, Osman M. Bakr, and Omar F. Mohammed
    Nano Lett., 2017, 17 (3), pp 2021–2027 
Keywords:
defects; ion migration; lead halide perovskite crystal; Nanometer surface layers; one vs two-photon excitation
  • Doping-Induced Anisotropic Self-Assembly of Silver Icosahedra in [Pt2Ag23Cl7(PPh3)10] Nanoclusters
    Megalamane S. Bootharaju, Sergey M. Kozlov, Zhen Cao, Moussab Harb , Niladri Maity, Aleksander Shkurenko, Manas R. Parida, Mohamed N. Hedhili, Mohamed Eddaoudi, Omar F. Mohammed, Osman M. Bakr, Luigi Cavallo, and Jean-Marie Basset
    J. Am. Chem. Soc., 2017, 139 (3), pp 1053–1056
Keywords:
nanocluster
  • Inorganic Lead Halide Perovskite Single Crystals: Phase-Selective Low-Temperature Growth, Carrier Transport Properties, and Self-Powered Photodetection
    Makhsud I. Saidaminov, Md Azimul Haque, Jawaher Almutlaq, Smritakshi Sarmah, Xiao-He Miao, Raihana Begum, Ayan A. Zhumekenov, Ibrahim Dursun, Namchul Cho, Banavoth Murali, Omar F. Mohammed, Tom Wu, and Osman M. Bakr
    Advanced Optical Materials, 2017, Vol. 5, Issue 2
Keywords:
perovskite; photodetectors; self-powered
  • ​Temperature-Induced Lattice Relaxation of Perovskite Crystal Enhances Optoelectronic Properties and Solar Cell Performance
    Banavoth Murali, Emre Yengel, Wei Peng, Zhijie Chen, Mohd S. Alias, Erkki Alarousu, Boon S. Ooi, Victor Burlakov, Alain Goriely, Mohamed Eddaoudi, Osman M. Bakr, and Omar F. Mohammed
    J. Phys. Chem. Lett., 2017, 8, pp 137–143
Keywords:
perovskite, crystal, optoelectronic, solar cell
  • ​Synthesis and Optical Properties of a Dithiolate/Phosphine-Protected Au28 Nanocluster
    Maha A. Aljuhani, Megalamane S. Bootharaju, Lutfan Sinatra, Jean Marie Basset, Omar F. Mohammed, and Osman M. Bakr
    J. Phys. Chem. C, Just Accepted Manuscript
Keywords:
nanocluster
  • ​Four-dimensional Ultrafast Electron Microscopy: Insights into an Emerging Technique
    Aniruddha Adhikari, Jeffrey K. Eliason, Jingya Sun, Riya Bose, David J. Flannigan, and Omar F. Mohammed
    ACS Appl. Mater. Interfaces, 20179 (1), pp 3–16​
Keywords:
ultrafast electron microscopy, 4D-UEM
  • Engineering-Interfacial Charge Transfer in CsPbBr3 Perovskite Nanocrystals by Heterovalent Doping
    Raihana Begum, Manas R Parida, Ahmed L. Abdelhady, Banavoth Murali, Noktan Alyami, Ghada H. Ahmed, Mohamed Nejib Hedhili, Osman M. Bakr, and Omar F. Mohammed
    J. Am. Chem. Soc., 2017139 (2), pp 731–737​
Keywords:
charge transfer, nanocrystal, perovskite
  • Real-time observation of intersystem crossing induced by charge recombination during bimolecular electron transfer reactions
    Amani A. Alsam, Shawkat M. Aly, Manas R. Parida, Erkki Alarousu, Zhen Cao, Luigi Cavallo, and Omar F. Mohammed
    Dyes and Pigments, 2017, Vol. 136, pages 881-886
Keywords:
Bimolecular electron transfer; Charge recombination; Intersystem crossing; Triplet state; Pump-probe experiments
  • ​Single-step colloidal quantum dot films for infrared solar harvesting
    Amirreza Kiani, Brandon R. Sutherland, Younghoon Kim, Olivier Ouellette, Larissa Levina, Grant Walters, Cao-Thang Dinh, Mengxia Liu, Oleksandr Voznyy, Xinzheng Lan, Andre J. Labelle, Alexander H. Ip, Andrew Proppe, Ghada H. Ahmed, Omar F. Mohammed, Sjoerd Hoogland and Edward H. Sargent
    Appl. Phys. Lett. 109, 183105 (2016)
Keywords:
band gap, solar cells, solvents, semiconductors
  • ​Pure crystal orientation and anisotropic charge transport in large-area hybrid perovskite films
    Namchul Cho, Feng Li, Bekir Turedi, Lutfan Sinatra, Smritakshi P. Sarmah, Manas R. Parida, Makhsud I. Saidaminov, Banavoth Murali, Victor M. Burlakov, Alain Goriely, Omar F. Mohammed, Tom Wu & Osman M. Bakr
    Nature Communications 7, Article number: 13407 (2016)
Keywords:
crystal, hybrid perovskite film
  • ​Surface Restructuring of Hybrid Perovskite Crystals
    Banavoth Murali, Sukumar Dey, Ahmed L. Abdelhady, Wei Peng, Erkki Alarousu, Ahmad R. Kirmani, Namchul Cho, Smritakshi Phukan Sarmah, Manas R. Parida, Makhsud I. Saidaminov, Ayan A. Zhumekenov, Jingya Sun, Mohd S. Alias, Emre Yengel, Boon S. Ooi, Aram Amassian, Osman M. Bakr, and Omar F. Mohammed
    ACS Energy Lett., 2016, 1, pp 1119–1126
Keywords:
hybrid perovskite crystals, semiconductor, optoelectronic
  • ​pH-Induced Surface Modification of Atomically Precise Silver Nanoclusters: An Approach for Tunable Optical and Electronic Properties
    Lina G. AbdulHalim, Zahra Hooshmand, Manas R. Parida, Shawkat M. Aly, Duy Le, Xin Zhang, Talat S Rahman, Matthew Pelton, Yaroslav Losovyj, Peter A. Dowben, Osman M. Bakr, Omar F. Mohammed, and Khabiboulakh Katsiev
    Inorg. Chem., 2016, 55 (21), pp 11522–11528
Keywords:
silver nanocluster, spectroscopy
  • ​Pure Cs4PbBr6: Highly Luminescent Zero-Dimensional Perovskite Solids
    Makhsud I. Saidaminov, Jawaher Almutlaq, Smritakshi Phukan Sarmah, Ibrahim Dursun, Ayan A. Zhumekenov, Raihana Begum, Jun Pan, Namchul Cho, Omar F. Mohammed, and Osman M. Bakr
    ACS Energy Lett., Just Accepted Manuscript
Keywords:
perovskites
  • ​Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors
    Ghada H. Ahmed, Jiakai Liu, Manas R. Parida, Banavoth Murali, Riya Bose, Noktan M. AlYami, Mohamed N. Hedhili, Wei Peng, Jun Pan, Tabot M. D. Besong, Osman M. Bakr, and Omar F. Mohammed
    J. Phys. Chem. Lett., 2016, 7, pp 3913–3919
Keywords:
perovskite, nanocrystal
  • ​Highly Efficient Perovskite-Quantum-Dot Light-Emitting Diodes by Surface Engineering
    Jun Pan, Li Na Quan, Yongbiao Zhao, Wei Peng, Banavoth Murali, Smritakshi P. Sarmah, Mingjian Yuan, Lutfan Sinatra, Noktan M. Alyami, Jiakai Liu, Emre Yassitepe, Zhenyu Yang, Oleksandr Voznyy, Riccardo Comin, Mohamed N. Hedhili, Omar F. Mohammed, Zheng Hong Lu, Dong Ha Kim, Edward H. Sargent, Osman M. Bakr
    Advanced Materials, (2016)
Keywords:
CsPbBr3;external quantum efficiency;light-emitting diodes;perovskite;quantum dots
  • ​Engineering of CH3NH3PbI3 Perovskite Crystals by Alloying Large Organic Cations for Enhanced Thermal Stability and Transport Properties
    Wei Peng, Xiaohe Miao, Valerio Adinolfi, Erkki Alarousu, Omar El Tall, Abdul-Hamid Emwas, Chao Zhao, Grant Walters, Jiakai Liu, Olivier Ouellette, Jun Pan, Banavoth Murali, Edward H. Sargent, Omar F. Mohammed, Osman M. Bakr
    Angewandte Chemie, 55 (36), pp 10686-10690, (2016)
Keywords:
crystal engineering; organic–inorganic hybrid composites; perovskite phases; photovoltaics
  • ​Porous-Hybrid Polymers as Platforms for Heterogeneous Photochemical Catalysis
    Rana R. Haikal, Xia Wang, Youssef S. Hassan, Manas R Parida, Banavoth Murali, Omar F. Mohammed, Perry J. Pellechia, Marc Fontecave, and Mohamed H. Alkordi
    ACS Appl. Mater. Interfaces, 8 (31), pp 19994–20002, (2016)
Keywords:
Porous-Hybrid Polymers, Photochemical
  • ​Perovskite Nanocrystals as a Color Converter for Visible Light Communication
    Ibrahim Dursun, Chao Shen, Manas R Parida, Jun Pan, Smritakshi P. Sarmah, Davide Priante, Noktan Alyami, Jiakai Liu, Makhsud I. Saidaminov, Mohd S. Alias, Ahmed L. Abdelhady, Tien Khee Ng, Omar F. Mohammed, Boon S. Ooi, and Osman M. Bakr
    ACS Photonics, 3 (7), pp 1150–1156, (2016)
Keywords:
visible light communication, LED, laser diode, perovskite, nanocrystal
  • ​Real-space Mapping of Surface Trap States in CIGSe Nanocrystals using 4D Electron Microscopy
    Riya Bose, Ashok Bera, Manas R Parida, Aniruddha Adhikari, Basamat S. Shaheen, Erkki Alarousu, Jingya Sun, Tom Wu, Osman M. Bakr, Omar F. Mohammed
    Nano Lett., 16 (7), pp 4417–4423, (2016)
Keywords:
solar, optoelectronics, 4D Electron Microscopy, nanocrystal
  • Formamidinium Lead Halide Perovskite Crystals with Unprecedented Long Carrier Dynamics and Diffusion Length
    Ayan A. Zhumekenov, Makhsud I. Saidaminov, Md Azimul Haque, Erkki Alarousu, Smritakshi Phukan Sarmah, Banavoth Murali, Ibrahim Dursun, Xiao-He Miao, Ahmed L. Abdelhady, Tom Wu, Omar F. Mohammed, Osman M. Bakr
    ACS Energy Lett., 2016, 1, pp 32–37
Keywords:
perovskite, crystals
  • Gold Doping of Silver Nanoclusters: A 26-Fold Enhancement in the Luminescence Quantum Yield
    Giada Soldan, Maha A. Aljuhani, Megalamane S. Bootharaju, Lina G. AbdulHalim, Manas R. Parida, Abdul-Hamid Emwas, Omar F. Mohammed, Osman M. Bakr
    Angewandte Chemie, 128, pp 3843-3847, (2016)
Keywords:
Koordinationschemie;Nanocluster;Nanolegierungen;Photolumineszenz;Supramolekulare Chemie
  • ​Remarkably high conversion efficiency of inverted bulk heterojunction solar cells: from ultrafast laser spectroscopy and electron microscopy to device fabrication and optimization
    Q. A. Alsulami, B. Murali, Y. Alsinan, M. R. Parida, S. M. Aly, and O. F. Mohammed
    Advanced Energy Materials, 6 (11), (2016)
Keywords:
bulk heterojunction; grain alignment; high-resolution electron microscopy; interfacial charge transfer; solar cells; laser spectroscopy
  • Real-space Visualization of Energy Loss and Carrier diffusion in Nanowire Array using Four-Dimensional Electron Microscopy
    Riya Bose, Jingya Sun,  Jafar I. Khan, Basamat S. Shaheen, Aniruddha Adhikari, Tien Khee Ng, V. M. Burlakov, Manas R. Parida, Davide Priante, A. Goriely, Boon S. Ooi, Osman M. Bakr, and Omar F. Mohammed
    Advanced Materials, 28 (25), pp 5106-5111, (2016)
Keywords:
Nanowire Array, Four-Dimensional Electron Microscopy
  • Mapping Carrier Dynamics on Material Surfaces in Space and Time using Scanning Ultrafast Electron Microscopy
    Jingya Sun, Aniruddha Adhikari, Basamat S. Shaheen, Haoze Yang, and Omar F. Mohammed
    J. Phys. Chem. Lett., 7(6), pp 985-994, (2016)
Keywords:
Ultrafast Electron Microscopy, Solar Cells, Optoelectronics
  • ​10-fold enhancement in light-driven water splitting using niobium oxynitride microcone array films
    Basamat S. Shaheen, Ahmed M. Hafez, Banavoth Murali, Ahmad R. Kirmani, Aram Amassian, Omar F. Mohammed, Nageh K. Allam
    Solar Energy Materials and Solar Cells, 151, 149-153, (2016)
Keywords:
Oxynitride; Water splitting; Anodization; Photo-electrodes; Microcones
  • ​Solution-Grown Monocrystalline Hybrid Perovskite Films for Hole-Transporter-Free Solar Cells
    Wei Peng, Lingfei Wang, Banavoth Murali, Kang-Ting Ho, Ashok Bera, Namchul Cho, Chen-Fang Kang, Victor M. Burlakov, Jun Pan, Lutfan Sinatra, Chun Ma, Wei Xu, Dong Shi, Erkki Alarousu, Alain Goriely, Jr-Hau He, Omar F. Mohammed, Tom Wu, Osman M. Bakr
    Advanced Materials, 28(17), pp 3383-3390, (2016)
Keywords:
CH3NH3PbBr3; hole-transporter-free solar cells; hybrid perovskites; single crystals
  • ​Robust and Air-Stable Sandwiched Organo-Lead Halide Perovskites for Photodetector Applications
    Banavoth Murali, Makhsud I. Saidaminov, Ahmed L. Abdelhady, Wei Peng, Jiakai Liu, Jun Pan, Osman M. Bakr, Omar F. Mohammed
    J. Mater. Chem. C, 4, pp 2545-2552, (2016)​
Keywords:
Perovskites, Photodetector , Solar Cells, Organo-Lead Halide
  • Enhanced Optoelectronic Performance of a Passivated Nanowire-based Device: Key Information from Real-space Imaging using 4D Electron Microscopy
    Jafar I. Khan, Aniruddha Adhikari, Jingya Sun, Davide Priante, Riya Bose, Basamat S. Shaheen, Tien Khee Ng, Chao Zhao, Osman M. Bakr, Boon S. Ooi, Omar F. Mohammed
    Small, 12(17), pp 2313-2320, (2016)​

Keywords:
4D Ultrafast microscopy, charge carrier dynamics, passivation, InGaN nanowires, carrier recombination
  • ​Ultrathin Cu2O as an efficient inorganic hole transporting material for perovskite solar cells
    Weili Yu, Feng Li, Hong Wang, Erkki Alarousu, Yin Chen, Bin Lin, Lingfei Wang, Mohamed Nejib Hedhili, Yangyang Li, Kewei Wu, Xianbin Wang, Omar F. Mohammed, and Tom Wu
    Nanoscale, 8, pp 6173-6179, (2016)​
Keywords:
perovskite, solar cell, thermal oxidation
  • ​Triplet excited state properties in variable gap π-conjugated donor-acceptor-donor chromophores
    Seda Cekli, Russell W. Winkel, Erkki Alarousu, Omar F. Mohammed, and Kirk S Schanze
    Chem. Sci., 7, 3621-3631, (2016)
Keywords:
triplet excited state properties, variable band-gap, chromophores, electrochemical, photophysical
  • ​Heterovalent dopant incorporation for bandgap and type engineering of perovskite crystals
    Ahmed L. Abdelhady, Makhsud I. Saidaminov, Banavoth Murali, Valerio Adinolfi, Oleksandr Voznyy, Khabiboulakh Katsiev, Erkki Alarousu, Riccardo Comin, Ibrahim Dursun, Lutfan Sinatra, Edward H. Sargent, Omar F. Mohammed, and Osman M. Bakr
    J. Phys. Chem. Lett., 7 (2), pp 295–301, (2016)
Keywords:
perovskite crystal, dopant incorporation, heterovalent
  • Templated atom-precise galvanic synthesis and structure elucidation of a [Ag24Au(SR)18]− nanocluster
    Megalamane S. Bootharaju, Chakra P. Joshi, Manas R. Parida, Omar F. Mohammed, Osman M. Bakr
    Angewandte Chemie Int. Ed., 55(3), pp 922–926, (2016)
Keywords:
Galvanic synthesis, Structure elucidation, Nanocluster
  • The impact of electrostatic interactions on ultrafast charge transfer at Ag29 nanocluster - and CdTe quantum dot-fullerene interfaces
    Ghada H. Ahmed, Manas R. Parida, Alberto Tosato, Lina G. AbdulHalim, Anwar Usman, Qana A. Alsulami, Banavoth Murali, Erkki Alarousu, Osman M. Bakr, and Omar F. Mohammed
    J. Mater. Chem. C, 4, pp 2894-2900, (2016)​
Keywords:
Electrostatic interactions, Quantum dots
  • Ultrafast static and diffusion-controlled electron transfer at Ag29 nanocluster/molecular acceptor interfaces
    Omar F. Mohammed, Shawkat Aly, Lina G. AbdulHalim, Tabot Besong, Giada Soldan, and Osman M. Bakr
    Nanoscale, 8, pp 5412-5416, (2016)
Keywords:
Diffusion-controlled electron transfer
  • Fast crystallization and improved stability of perovskite solar cells with Zn2SnO4 electron transporting layer: Interface matters 
    Ashok Bera, Arif D. Sheikh, Md. Azimul Haque, Riya Bose, Erkki Alarousu, Omar F. Mohammed, and Tom Wu
    ACS Appl. Mater. Interfaces, 7 (51), pp 28404–28411, (2015)
Keywords:
perovskite solar cells, Zn2SnO4, electron transport layer, transient absorption spectroscopy
  • Air-stable surface-passivated perovskite quantum dots for ultra-robust, single- and two-photon-induced amplified spontaneous emission
    Jun Pan, Smritakshi P. Sarmah, Banavoth Murali, Ibrahim Dursun, Wei Peng, Manas R Parida, Jiakai Liu, Lutfan Sinatra, Noktan Alyami, Chao Zhao, Erkki Alarousu, Tien Khee Khee Ng, Boon S. Ooi, Osman M. Bakr, and Omar F. Mohammed
    J. Phys. Chem. Lett., 6(24), pp 5027-5033, (2015)
Keywords:
Quantum dots
  • Dendritic tip-on polytriazine-based carbon nitride photocatalyst with high hydrogen evolution activity
    Manas K. Bhunia, Sigismund Melissen, Manas R Parida, Pradip Sarawade, Jean-Marie Basset, Dalaver H. Anjum, Omar F. Mohammed, Philippe Sautet, Tangui Le Bahers, and Kazuhiro Takanabe
    Chem. Mater., 27(24), pp 8237-8247, (2015)
Keywords:
Polytriazine, Carbon, Photocatalyst
  • Overcoming the cut-off charge transfer bandgaps at the Pbs quantum dot interface
    Ala’a O. El-Ballouli, Erkki Alarousu, Ahmad R. Kirmani, Aram Amassian, Osman M. Bakr, and Omar F. Mohammed
    Advanced Functional Materials, 25(48), pp 7435-7441, (2015)
Keywords:
Quantum dots, Photovoltaic devices, Charge carrier injection, Time-resolved spectroscopy, Interfacial electrostatic interaction
  • Real-space imaging of carrier dynamics of materials surfaces by second-generation four-dimensional scanning ultrafast electron microscopy
    Jingya Sun, Vasily A. Melnikov, Jafar I. Khan, and Omar F. Mohammed
    J. Phys. Chem. Lett., 6(19), pp 3884–3890, (2015)​
Keywords:
Ultrafast electron microscopy, Surface dynamics, Energy loss, Electron impact dynamics, Photon impact dynamics
  • Bimolecular excited-state electron transfer with surprisingly long-lived radical ions
    A. A. Alsam, S. M. Aly, A. Usman, M. R. Parida, S. del-Gobbo, E. Alarousu, and O. F. Mohammed
    J. Phys. Chem. C, 119(38), pp 21896-21903, (2015)​
Keywords:
Bimolecular electron transfer
  • CH3NH3PbCl3 single crystals: inverse temperature crystallization and visible-blind UV-photodetector
    G. Maculan, A. D. Sheikh, A. L. Abdelhady, M. I. Saidaminov, M. A. Haque, M. Banavoth, E. Alarousu, O. F. Mohammed, T. Wu, O. M. Bakr
    J. Phys. Chem. Lett., 6(19), pp 3781-3786, (2015)
Keywords:
Inverse temperature crystallization, Crystals, Visible-Blind UV photodetector
  • Nano surface engineering of Mn2O3 for potential light-harvesting application
    Prasenjit Kar, Samim Sardar, Srabanti Ghosh, Manas R. Parida, Bo Liu, Omar F. Mohammed, Peter Lemmens, Samir Kumar Pal 
    J. Mater. Chem. C, 3, pp 8200-8211, (2015)
Keywords:
Nano surface engineering
  • The impact of grain alignment of the electron transporting layer on the performance of inverted bulk heterojunction solar cells
    Banavoth Murali, Abdulrahman El Labban, Jessica Eid, Erkki Alarousu, Dong Shi, Qiang Zhang, Xixiang Zhang, Osman M. Bakr, and Omar F. Mohammed
    Small, 11(39), pp 5272-5279, (2015)
Keywords:
Grains alignment, High efficiency, Inverted bulk heterojunction, PBDTTPD:PCBM, Transient absorption spectroscopy
  • Facile synthesis and high performance of a new carbazole-based hole-transporting material for hybrid perovskite solar cells
    H. Wang, A.D. Sheikh, Q. Feng, F. Li, Y. Chen, W. Yu, E. Alarousu, C. Ma, M.A. Haque, D. Shi, Z.-S. Wang, O.F. Mohammed, O.M. Bakr, and T. Wu
    ACS Photonics, 2 (7), pp 849–855, (2015)
Keywords:
Perovskite solar cell, Carbazole, Hole-transporting material, Hole mobility
  • Ultrafast excited-state dynamics of diketopyrrolopyrrole (DPP)-based materials: static versus diffusion-controlled electron transfer process
    Q.A. Alsulami, S.M. Aly, S. Goswami, E. Alarousu, A. Usman, K.S. Schanze, and O.F. Mohammed
    J. Phys. Chem. C,119 (28), pp 15919–15925, (2015)
Keywords:
Femtosecond and nanosecond transient absorption spectroscopy
  • High-quality bulk hybrid perovskite single crystals within minutes by inverse temperature crystallization
    M.I. Saidaminov, A.L. Abdelhady, B. Murali, E. Alarousu, V.M. Burlakov, W. Peng, I. Dursun, L. Wang, Y. He, G. Maculan, A. Goriely, T. Wu, O.F. Mohammed & O.M. Bakr
    Nature Communications 6, 7586, (2015)
Keywords:
Inverse temperature crystallization
  • To what extent can charge localization influence electron injection efficiency at graphene-porphyrin interfaces?
    Omar F. Mohammed, Manas Parida, Shawkat Aly, Erkki Alarousu, Aravindan Sridharan, D.H. Nagaraju and Husam N. Alshareef  
    Phys. Chem. Chem. Phys., 17, pp14513-14517, (2015)
Keywords:
Graphene-porphyrin interfaces
  • Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better
    Jessica Eid, Anwar Usman, Issam Gereige, Jeroen Van Duren, Vadim Lyssenko, Karl Leo, Omar F. Mohammed
    Solar Energy Materials and Solar Cells, 140, pp 33–37, (2015)
Keywords:
CIGS solar cells, Ultrafast photophysics, Pump-probe reflectance spectroscopy, Carrier recombination, Dielectric function model
  • Quantum confinement-tunable intersystem crossing and triplet state lifetime of cationic porphyrin-CdTe quantum dot nano-assemblies
    Omar F. Mohammed, Ghada Ahmed, Shawkat Aly, Anwar Usman, Mohammed Eita and Vasily Melnikov
    Chem. Commun., 51, pp 8010-8013, (2015)​​
Keywords:
Quantum dots
  • The recombination mechanisms leading to amplified spontaneous emission at the true-green wavelength in CH3NH3PbBr3 perovskites
    D. Priante, I. Dursun, M.S. Alias, D. Shi, V.A. Melnikov, T.K. Ng, O.F. Mohammed, O.M. Bakr and B.S. Ooi
    Appl. Phys. Lett. 106, 081902, (2015)
Keywords:
Amplified spontaneous emissions, Display application, Excitation threshold, Radiative recombination, Radiative transitions, Recombination mechanisms, Solid state lighting, Temperature dependent photoluminescences
  • Nanoscale cross-point resistive switching memory comprising p-Type SnO bilayers
    K. Hota, Mohamed N. Hedhili, Qingxiao Wang, Vasily A. Melnikov, Omar F. Mohammed and Husam N. Alshareef
    Advanced Electronic Materials, Volume 1, Issue 3, (2015)
Keywords:
Bilayer, Cross-point structure, P-type oxide, Resistive switching
  • Real-time observation of ultrafast electron injection at graphene-Zn porphyrin interfaces
    Omar F. Mohammed, Dilshad Masih, Shawkat Aly, Anwar Usman and Erkki Alarousu 
    Phys. Chem. Chem. Phys., 17, 9015-9019, (2015)
Keywords:
Ultrafast electron injection, Graphene-Zn porphyrin interfaces
  • Molecular-structure control of ultrafast electron injection at cationic porphyrin-CdTe quantum dot interfaces
    Shawkat M. Aly , Ghada H. Ahmed , Basamat S. Shaheen , Jingya Sun , and Omar F. Mohammed
    J. Phys. Chem. Lett., 6 (5), pp791–795, (2015)
Keywords:
Ultrafast Electron Injection, Quantum Dots
  • Photoinduced triplet-state electron transfer of platinum porphyrin: A one-step direct method for sensing iodide to an unprecedented detection limit
    Dilshad Masih, Shawkat M. Aly, Erkki Alarousu, and Omar F. Mohammed
    J. Mater. Chem. A, 3, 6733-6738, (2015)
Keywords:
Photoinduced triplet-state electron transfer, platinum porphyrin, sensing iodide
  • Low trap-state density and long carrier diffusion in organolead trihalide perovskite single crystals
    Dong Shi, Valerio Adinolfi, Riccardo Comin, Mingjian Yuan, Erkki Alarousu, Andrei Buin, Yin Chen, Sjoerd Hoogland, Alexander Rothenberger, Khabiboulakh Katsiev, Yaroslav Losovyj, Xin Zhang, Peter A. Dowben, Omar F. Mohammed, Edward H. Sargent, Osman M. Bakr
    Science, 347(6221) pp 519-522, (2015)
Keywords:
Organolead trihalide perovskite single crystals
  • Tunable-photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticles
    Manas R. Parida, Shawkat M. Aly, Erkki Alarousu, and Omar F. Mohammed
    J. Phys. Chem. C, 119 (5), pp 2614–2621, (2015)
Keywords:
Tunable-photophysical processes, Porphyrin macrocycles
  • Ambient layer-by-layer ZnO assembly for highly efficient polymer bulk heterojunction solar cells
    Mohamed Eita, Abdulrahman El Labban, Federico Cruciani, Anwar Usman, Pierre M. Beaujuge and Omar F. Mohammed
    Advanced Functional Materials, 25(10), pp 1558–1564, (2015)
Keywords:
Layer-by-layer ZnO nanoparticles, Polymer donor PBDTTPD, Fullerene acceptor PCBM, Bulk heterojunction
  • Direct femtosecond observation of charge carrier recombination in ternary semiconductor nanocrystals: the effect of composition and shelling
    Riya Bose, Ghada H. Ahmed, Erkki Alarousu, Manas R Parida, Ahmed Lutfi Abdelhady, Osman M. Bakr, and Omar F. Mohammed.
    J. Phys. Chem. C, 119 (6), pp 3439–3446, (2015)
Keywords:
Charge carrier recombination, Semiconductor nanocrystals
  • Carrier dynamics of a visible-light-responsive Ta3N5 photoanode for water oxidation
    Ahmed Ziani, Ela Nurlaela, Dattatray S. Dhawale, Diego Alves Silva, Erkki Alarousu, Omar F. Mohammed and Kazuhiro Takanabe
    Phys. Chem. Chem. Phys., 17, 2670-2677, (2015)
Keywords:
Visible-light-responsive Ta3N5 photoanode
  • Solvent-dependent excited-state hydrogen transfer and intersystem crossing in 2-(2’-Hydroxyphenyl)-benzothiazole
    Shawkat M. Aly, Anwar Usman, Maytham AlZayer, Ghada A. Hamdi, Erkki Alarousu, and Omar F. Mohammed
    J. Phys. Chem. B, 119 (6), pp 2596–2603, (2015)
Keywords:
Hydrogen Transfer, Intersystem Crossing, 2-(2′-hydroxyphenyl)-benzothiazole
  • A layer-by-layer ZnO nanoparticle-PbS quantum dot- self-assembly platform for ultrafast interfacial electron injection
    Mohamed Eita, Anwar Usman, Ala’a O. El-Ballouli, Erkki Alarousu, Osman M. Bakr, and Omar F. Mohammed
    Small, 11(1), pp 112-118, (2015)
Keywords:
Layer-by-layer ZnO nanoparticles, PbS quantum dots, Heterojunction, Electron injection, Femtosecond transient absorption spectroscopy
  • Photophysics of organometallic platinum(II) derivatives of the diketopyrrolopyrrole chromophore
    Subhadip Goswami, Russell W Winkel, Erkki Alarousu, Ion Ghiviriga, Omar F. Mohammed, and Kirk S. Schanze.
    J. Phys. Chem. A, 118 (50), pp 11735–11743, (2014)
Keywords:
Diketopyrrolopyrrole (DPP) chromophores, Photophysics
  • Perovskite oxide SrTiO3 as an efficient electron transporter for hybrid perovskite solar cells
    Ashok Bera, Kewei Wu, Arif Sheikh, Erkki Alarousu, Omar F. Mohammed, and Tom Wu
    J. Phys. Chem. C, 118 (49), pp 28494–28501, (2014)
Keywords:
Solar cell, Perovskite, SrTiO3, Electron transport layer, Transient absorption spectroscopy
  • Photoinduced energy and electron transfer in rubrene-benzoquinone and rubrene-porphyrin systems
    Jafar I. Khan, Abdullah Saud Abbas, Shawkat M. Aly, Anwar Usman, Vasily Melnikov, Erkki Alarousu, and Omar F. Mohammed
    Chem. Phys. Lett. 616, pp 237-242, (2014)
Keywords:
Electron Transfer, Rubrene–benzoquinone, Rubrene–porphyrin
  • Ultrafast photoinduced electron transfer in a pi-conjugated oligomer/porphyrin complex
    Shawkat M. Aly, Subhadip Goswami, Qana A. Alsulami, Kirk S. Schanze, and Omar F. Mohammed
    J. Phys. Chem. Lett. 5(19), pp 3386-3390, (2014)
Keywords:
Platinum-oligomer, Ultrafast charge transfer, Cationic porphyrin, Femtosecond transient absorption spectroscopy
  • Ultrafast electron injection at the cationic porphyrin- graphene interface assisted by molecular flattening
    Shawkat Aly, Manas Parida, Erkki Alarousu, and Omar F. Mohammed
    Chem. Commun., 50(72), pp 10452-10455, (2014)
Keywords:
Ultrafast transient absorption, Porphyrin-Graphene
  • Impact of metal ions in porphyrin-based applied materials for visible-light photocatalysis: key information from ultrafast electronic spectroscopy
    Prasenjit Kar, Samim Sardar, Erkki Alarousu, Jingya Sun, Zaki S. Seddigi, Saleh A. Ahmed, Ekram Y. Danish, Omar F. Mohammed, and Samir Kumar Pal
    Chemistry - A European Journal. 20, pp 10475-10483, (2014)
Keywords:
Femtochemistry, Femtosecond transient absorption spectroscopy, Nanohybrids
  • Ultrafast carrier trapping of a metal-doped titanium dioxide semiconductor revealed by femtosecond transient absorption spectroscopy
    Jingya Sun, Yang Yang, Jafar I. Khan, Erkki Alarousu, Zaibing Guo, Xixiang Zhang, Qiang Zhang, and Omar F. Mohammed
    ACS Appl Mater Inter, 6(13), pp 10022-10027, (2014)
Keywords:
Metal-doped titanium dioxide, Transient absorption spectroscopy
  • Excited-state intramolecular hydrogen transfer (ESIHT) of 1,8-Dihydroxy-9,10-anthraquinone (DHAQ) characterized by ultrafast electronic and vibrational spectroscopy and computational modeling
    Omar F. Mohammed, Dequan Xiao, Victor S. Batista, and Erik T. J. Nibbering
    J. Phys. Chem. A, 118 (17), pp 3090–3099, (2014)
Keywords:
Ultrafast electronic and vibrational spectroscopy, Computational modeling
  • Remarkable fluorescence enhancement versus complex formation of cationic porphyrins on the surface of ZnO nanoparticles
    Shawkat M. B. Aly, Mohamed Eita, Jafar I. Khan, Erkki Alarousu, and Omar F. Mohammed
    J. Phys. Chem. C, 118(23), pp 12154-12161, (2014)
Keywords:
Fluorophores, Bio-imaging, Cationic porphyrins
  • Real-time observation of ultrafast intraband relaxation and exciton multiplication in PbS quantum dots
    Ala’a O. El-Ballouli, Erkki Alarousu, Anwar Usman, Jun Pan, Osman M. Bakr, and Omar F. Mohammed
    ACS Photonics, 1 (3), pp 285–292, (2014)
Keywords:
Inraconduction band relaxation, Exciton multiplication, PbS quantum dots, Femtosecond broadband transient absorption spectroscopy
  • Quantum confinement-tunable ultrafast charge transfer at the PbS quantum dot and phenyl-C61-butyric acid methyl ester interface
    Ala’a O. El-Ballouli, Erkki Alarousu, Marco Bernardi, Shawkat M. Aly, Alec P. Lagrow, Osman M. Bakr, and Omar F. Mohammed
    J. Am. Chem. Soc., 136 (19), pp 6952–6959, (2014)
Keywords:
Quantum dots
  • Generation of multiple excitons in Ag2S quantum dots: single high-energy versus multiple-photon excitation
    Jingya Sun, Weili Yu, Anwar Usman, Tayirjan T. Isimjan, Silvano DGobbo, Erkki Alarousu, Kazuhiro Takanabe, and Omar F. Mohammed
    J. Phys. Chem. Lett., 5 (4), pp 659–665, (2014)
Keywords:
Exciton multiplication, Ag2S quantum dots, Femtosecond broad-band transient spectroscopy, Auger recombination