关于举行阿卜杜拉国王科技大学Omar F. Mohammed教授学术报告会的通知

2022-10-11 1370

报告题目Imaging Charge Carrier Dynamics in X-Ray Scintillation and Solar Materials

   Omar F. Mohammed教授(King Abdullah University of Science and Technology (KAUST)

报告时间20221011日(周二)下午14:30-16:30

报告地点 Zoom会议 ID955 5902 8664  密码: 579684 直播

腾讯会议:387-330-913 (转播)

Zoom会议直播网址https://zoom.us/j/95559028664?pwd=Z3BNbnRXcnpPbHowb3U2VDlVcWNmUT09

 

报告摘要

The separation and collection of photogenerated charge carriers in all optoelectronic devices are limited by the losses and ambiguous dynamical events at the surfaces and interfaces of the absorber layers.1-3 These events occur in ultrafast time scales and can only be visualized in space and time by scanning ultrafast electron microscopy (the sole technique capable of surface-selective visualization of light-triggered carrier dynamics at nanometer scale). In this method, the surface of the solar materials is excited by a clocking optical pulse and the photo-induced changes will be directly imaged using a pulsed electron beam that generate secondary electrons with a couple of electron volts energy, which are emitted from the very top surface of the material in a manner that is extremely sensitive to the localization of the electron and hole on the photoactive material surfaces. By using this powerful technique, we have clearly demonstrated in space and time how the surface orientations, surface oxidation and passivation can significantly impact the overall dynamical processes of photo-generated charge carriers in solar materials.4-5 Finally, the tremendous impact of nearly 100% interfacial energy transfer and ultrafast charge carriers dynamics including carrier injection, separation and recombination at the surface and interface of semiconductor perovskite nanostructures, metal organic frameworks (MOFs), organic emitters and perovskite single crystals on the performance of solar cells device and X-ray imaging scintillators will be also presented and discussed. 6-8

References

1- O. M. Bakr, O. F. Mohammed., Science 355, 1260 (2017).

2- R. Begum, M. R. Parida, A. L. Abdelhady, B. Murali, N. Alyami, G. H. Ahmed, M. N. Hedhili, O. M. Bakr, and O. F. Mohammed., J. Am. Chem. Soc. 139, 731 (2017).

3- O. F. Mohammed, D.-S. Yang, S. Pal, A. H. Zewail, J. Am. Chem. Soc. 1337708 (2011).

4- R. Bose, A. Bera, M. R. Parida, A. Adhikari, B. S. Shaheen, E. Alarousu, J. Sun, T. Wu, O. M. Bakr, O. F. Mohammed, Nano Lett. 16, 4417 (2016).

5- A. M. El-Zohry, B. S. Shaheen, V. M. Burlakov, J. Yin, M. N. Hedhili, S. Shikin, B. S. Ooi, O. M. Bakr, O. F. MohammedChem, 5, 706-718 (2019).

6- P. Maity, N. A. Merdad, J. Yin, K. J. Lee, L. Sinatra, O. M. Bakr, O. F. Mohammed, ACS Energy Lett., 6, 2602 (2021).

7- Y. Zhang, R. Sun, X. Ou, K. Fu, Q. Chen, Y. Ding, L-J Xu, L. Liu, Y. Han, A. V. Malko, X. Liu, H. Yang, O. M. Bakr, H. Liu, O. F. MohammedACS Nano, 132520 (2019).

8- J.-X. Wang, L. Gutie´rrez-Arzaluz, X. Wang, M. Almalki, J. Yin, J. Czaban-Jóźwiak, O. Shekhah, Y. Zhang, O. B. Bakr, M. Eddaoudi, O. F. Mohammed, Matter, 5, 253-265 (2022).

 

 

报告人简介

Dr. Mohammed is Professor of Chemistry and Materials Science and Engineering; and the principal investigator of ultrafast laser spectroscopy and four-dimensional (4D) electron imaging laboratory at KAUST. He earned a Ph.D in Physical and Theoretical Chemistry from Humboldt University of Berlin, Germany (2006). Prior to joining KAUST in December 2012, Dr. Mohammed was a senior research associate with Professor Zewail (Nobel Prize in Chemistry 1999) at California Institute of Technology (Caltech), where he worked on the development of new ultrafast laser spectroscopic and time-resolved electron imaging techniques.

The research activities of Dr. Mohammed are focused on the development of highly efficient solar cells, photocatalytic reactions, light-emitting diodes, X-ray imaging scintillators and photodetectors with the aid of ultrafast laser spectroscopy, 4D electron imaging and computational materials. Dr. Mohammed has established himself not only as a world-leader in 4D electron microscopy, but also as an internationally recognized scientist in the field of surface and interfacial charge carrier dynamics. He has pioneered the development of surface and interface characterization techniques that have opened new avenues for the materials and optoelectronic communities.


Dr. Mohammed has published over 300 articles in international peer-reviewed journals including Science, Nature, Nature Materials, Nature Energy, Science Advances, Joule, Matter, Advance Materials, Chem, JACS, ACS Nano, Chemical Reviews, Advanced Energy Materials, Nano Letters and ACS Energy Letters, and a large number of these papers are currently highly cited (34 papers). Dr. Mohammed has more than 23,000 citations and 76 h-index. In 2019 and 2020, 2021, Dr. Mohammed was identified as a Highly Cited Researcher by Web of Science. In January 2020, he joined the Editorial Advisory Board of the Journal of Physical Chemistry Letters (American Chemical Society) – one of the leading journals of the field of Physical Chemistry. In February, 2021, he was named a Fellow of the Royal Society of Chemistry. In March, 1, 2021, Dr. Mohammed was appointed an Associate Editor of ACS Applied Materials & Interfaces. In April 2021, he was named a Fellow of the Institute of Materials, Minerals and Mining. Finally, he is the recipient of several prestigious awards, including the Distinguished Scholar Award from Arab Fund for Economic and Social Development, Kuwait; the State Prize in Basic Sciences, Egypt; Long-term Fellowship, Germany and the Japan Society for the Promotion of Science (JSPS) fellowship.


华南理工大学发光材料与器件国家重点实验室版权所有

地址:广东省广州市五山路381号华南理工大学北区科技园1号楼

电话:020-87113184 传真:020-87113184

邮箱:skllmd@scut.edu.cn