学术讲座
报告题目：Tuning Spin Polarized Lifetime in Two-Dimensional Perovskites
报告时间：2025-07-11 15:30
报告人： 陈熹翰 副教授
南方科技大学
报告地点：翔安校区能源材料大楼3号楼会议室2
转播地点：思明校区化报厅103教室，漳州校区生化主楼307教室
报告摘要：
The development of an efficient and stable energy conversion system requires a mechanistic understanding of the energy conversion process in different materials. Hybrid perovskite material systems show extraordinary promise in the field of optoelectronics due to their long carrier lifetime and carrier diffusion length, high photoluminescence quantum yield, and defect tolerance. Although previous work has identified important contributions from the dynamic structural response, the proposed lattice-carrier coupling mechanism is not yet fully understood. In this talk, we report small polaron formation (short-range electron-phonon interactions) in (4AMP)PbI4, where we directly visualize strong electron-phonon coupling via coherent acoustic phonon signals. At the same time, the deformation potential analysis could be further expanded to understand spin dynamics at high carrier density in (3AMP)PbI4, as well as carrier scattering potential in thermoelectric materials. Finally, to fully understand the factors governing the spin-relaxation in perovskites, a machine learning algorithm is developed and adopted to establish a HOMO-LUMO and polarizability-based spin relaxation rate. With the deep level of understanding of spin dynamics, the full photophysical and photochemical process can be resolved.
报告人简介：
Biographical sketch. Dr. Chen is an Associate professor at the Department of Mechanical and Energy Engineering, Southern University of Science and Technology. He received his bachelor’s degree in Chemistry from the Hong Kong University of Science and Technology (HKUST) in 2012. Later, he got his PhD degree in Physical Chemistry at University of California at Berkeley (UCB) in 2017. Between 2017 and 2021, Dr. Chen was a postdoctoral researcher at National Renewable Energy Laboratory (NREL) in the U.S. His research focuses on developing ultrafast spectroscopy for energy conversions systems including hot carrier solar cells, solar to fuel conversion and photoinduced spin dynamics. He has published over 60 peer-reviewed journal articles in international journals including Science, Nature Catalysis, ACS Energy Letters, Journal of the American Chemical Society, etc. He has received over 7000 citations with H index of 40. Dr. Chen has served as reviewers for various international journals including Nature Materials, Advanced Materials and more.
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