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Total result(s) found: 27
  • ​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