纳米标准与检测重点实验室第189期学术报告

报告题目：Solving the lead halide perovskite puzzle

报  告  人：Prof. Xiaoyang Zhu, Columbia University

时        间：2018年5月27日（周日） 上午10: 00

地        点：南楼二层会议室

邀  请  人：刘新风 研究员

报告摘要：

Research in my group aims to understand photophysics in nano, molecular, and hybrid semiconductors and interfaces. We focus on fundamental interactions beyond the single particle approximation, and probe the dynamics of quasiparticles (excitons, polarons, polaritons, etc.) that are important to a range of optoelectronic processes, such as solar energy conversion, light emission, and polariton condensation. Following a brief introduction to my research program, I will tell one particular story – the discovery of why lead halide perovskites (LHPs) work so well in solar cells and light emitting materials. A major puzzle from recent studies on LHPs is that optoelectronic performances suggest nearly perfect semiconductors despite the unavoidable presence of defects from room temperature and solution processing. Here we explain the essential physics in this class of materials based on their disordered phonon dynamics and dielectric functions.

报告人简介：

Xiaoyang Zhu is the Howard Family Professor of Nanoscience and a Professor of Chemistry at Columbia University. He received a BS degree from Fudan University in 1984 and a PhD from the University of Texas at Austin in 1989. He joined the faculty at Southern Illinois University as an Assistant Professor in 1993. In 1997, he moved to the University of Minnesota as a tenured Associate Professor, later a Merck endowed professor. In 2009, he returned to the University of Texas at Austin as the Vauquelin Regents Professor and served as directors of the DOE Energy Frontier Research Center (EFRC) and the Center for Materials Chemistry. In 2013, he moved to Columbia University.