Omar F. Mohammed

Assistant Professor, Chemical Science
Physical Science and Engineering Division
Center membership : 
KAUST Solar Center

Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging


Education Profile

  • ​​​Ph.D. Physical Chemistry, Max-Born Institute, 2006
  • M.S. Chemistry, Assiut University, 1999
  • B.S. Chemistry, Assiut University, 1995

Research Interests

Professor Mohammed's research is directed towards fundamental understanding of carrier dynamics in a variety of solar cell systems, including semiconductor quantum dots, polymers and perovskite solar cells with the aid of cutting-edge nanotechnology, ultrafast laser spectroscopy and four-dimensional electron imaging.

Selected Publications

  • M. Eita, A. El Labban, F. Cruciani, A. Usman, P. M. Beaujuge and O. F. Mohammed “Ambient Layer-by-Layer ZnO Assembly for Highly Efficient Polymer Bulk Heterojunction Solar Cells” Advanced Functional Materials, 25, 1558–1564 (2015).
  • J. Sun, V. A. Melnikov, J. Khan and O. F. Mohammed ”Real-space imaging of carrier dynamics of materials surfaces by second generation four-dimensional scanning ultrafast electron microscopy” Journal of Physical Chemistry Letters 6 (19), 3884–3890 (2015).
  • G. H. Ahmed, S.M. Aly, A. Usman, M. S. Eita, V. A. Melnikov, and O. F. Mohammed “Quantum Confinement-Tunable Intersystem Crossing and Triplet State Lifetime of Cationic Porphyrin-CdTe Quantum Dot Nanoassemblies” Chemical Communications, 51, 8010-8013 (2015).
  • M. I. Saidaminov, A. L. Abdelhady, M. Banavoth, E. Alarousu, V. M. Burlakov, W. Peng, I. Dursun, L. Wang, Y. He, G. Maculan1, A. Goriely, T. Wu, O. F. Mohammed and O. M. Bakr ”High-quality bulk hybrid perovskite single crystals within minutes by inverse temperature crystallization” Nature Communications, 6, 7586 (2015).
  • A. O. El-Ballouli, E. Alarousu, M. Bernardi, S. M. Aly, A. P. Lagrow, O. M. Bakr and O. F. Mohammed, “Quantum Confinement-Tunable Ultrafast Charge Transfer at the PbS Quantum Dot and Phenyl-C61-butyric Acid Methyl Ester Interface” Journal of the American Chemical Society, 136 (19), 6777–7186 (2014).
  • D-S. Yang, O. F. Mohammed and A.H. Zewail, “Environmental Scanning Ultrafast Electron Microscopy: Structural Dynamics of Solvation at Interfaces” Angewandte Chemie International Edition, 52 (10) 2897-2901 (2013).
  • O. F. Mohammed, D-S. Yang, S. K. Pal, and A. H. Zewail, “4D Scanning Ultrafast Electron Microscopy: Visualization of Materials Surface Dynamics” Journal of the American Chemical Society, 133 (20), 7708-7711 (2011).
  • D-S. Yang, O. F. Mohammed and A.H. Zewail, “Scanning Ultrafast Electron Microscopy” Proceedings of the National Academy of Sciences of the United States of America, 107 (34), 14993-14998 (2010).
  • O. F. Mohammed, “Ultrafast Intramolecular Charge Transfer of Formyl perylene Observed Using Femtosecond Transient Absorption Spectroscopy” Journal of Physical Chemistry A, 114 (43), 11576–11582 (2010).
  • O. F. Mohammed, P. C. Samartzis and A. H. Zewail, “Heating and Cooling Dynamics of Carbon Nanotubes Observed by Temperature-Jump Spectroscopy and Electron Microsecopy” Journal of the American Chemical Society, 131 (44), 16010–16011 (2009)
  • O. F. Mohammed, O.-H. Kwon, C. M. Othon and A. H. Zewail, “Charge Transfer Assisted by Collective H- Bonding Dynamics” Angewandte Chemie International Edition, 48 (34), 6251-6256 (2009).
  • O. F. Mohammed, K. Adamczk, N. Banjeri, J. Dreyer, B. Lang, E. T. J. Nibbering and E.Vauthey, “Direct Femtosecond Observation of the Tight and Loose Ion Pairs upon Photoinduced ​Bimolecular Electron Transfer” Angewandte Chemie International Edition, 47 (47) 9044-9048 (2008).
  • O. F. Mohammed, and E. Vauthey, “Simultaneous Generation of Different Types of Ion Pairs upon Charge Transfer Excitation of a Donor-Acceptor Complex Revealed by Ultrafast Transient Absorption Spectroscopy” Journal of Physical Chemistry A, 112 (26), 5804–5809 (2008).
  • O. F. Mohammed, D. Pines, J. Dreyer, E. Pines and E. T. J. Nibbering, “Sequential Proton Transfer through Water Bridges in Acid-Base Reactions” Science, 310 (5745), 83-86 (2005).