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Total result(s) found: 94
  • 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, Early View (2017)
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., Just Accepted Manuscript
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, Article ASAP​​
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., Just Accepted Manuscript​
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, Article ASAP​
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