Department of Chemistry Seminar - Ultrafast dynamics in energy conversion systems

Speaker: Professor Xihan CHEN

Institution: Southern University of Science and Technology

Hosted By: Professor Haipeng LU

Abstract:

The development of an efficient and stable energy conversion system requires a mechanistic understanding of the energy conversion process in different materials. Among them, the dynamic mechanism of the energy conversion material interface is one of the key factors that determine the energy conversion efficiency and stability of the material. Time-resolved ultrafast spectroscopy is currently one of the most effective techniques for studying energy conversion mechanisms, especially the interface-selective time-resolved ultrafast spectroscopy technique is the most powerful. Through pump-probe technology, the complete process of material conversion and energy transfer in the process of surface-interface energy conversion can be directly described. In recent years, a series of progress has been made in the field of interfacial energy conversion. This report mainly includes three parts, 1. In situ ultrafast absorption spectroscopy reveals the ultrafast reaction rate of carbon dioxide reduction and H2O2 formation 2. Ultrafast in situ reflectance spectroscopy reveals the ultrafast charge transfer on solar cell surfaces 3. Ultrafast polarization spectroscopy reveals the mechanism of carrier spin dynamics in two-dimensional perovskite materials. The photophysical properties of the materials are revealed by studying the above systems through ultrafast transient spectroscopy and provide basic theoretical guidance for the design of new materials, the development of new devices, and the optimization of existing energy conversion systems.