Dr. Zewen Xiao [Tokyo Institute of Technology, Japan]

Title: Photovoltaic Properties of Lead-Free Halide Perovskites and Double Perovskites: Insights from Electronic Dimensionality

Time: 10:30 - 11:30 AM, Monday, August 14, 2017

Place: C405, HPSTAR (Beijing)

Host: Huiyang Gou

Abstract

Despite the demonstration of rapid improvement in record power conversion efficiency (PCE) over the past few years, the ultimate commercialization of organic–inorganic lead (Pb) halide perovskite solar cell technology is still facing serious challenges, most notably with regards to cell instability against moisture and temperature and the inclusion of toxic Pb. Extensive efforts have been paid to search for nontoxic or low-toxicity and air-stable metal halide perovskite-based solar cell materials. So far, only tin halide perovskites have produced solar cells with reasonable PCEs; other lead-free halide perovskites have not produced efficient devices. Therefore, it is important to fully understand the photovoltaic properties of all reported lead-free halide perovskites. In this seminar, we introduce the concept of electronic dimensionality to account for the photovoltaic properties of perovskite-based solar cell materials, with focus on the recently-proposed halide double perovskites. Our results explain the challenges for realizing promising Pb-free halide perovskite absorbers for thin-film solar cell applications.

Biography of the Speaker:





Dr. Zewen Xiao received his Ph.D. degree in Materials Science from Tokyo Institute of Technology in 2015 under the supervision of Prof. Toshio Kamiya and Prof. Hideo Hosono. He worked as a postdoctoral fellow in Prof. Yanfa Yan’s group at The University of Toledo (2015 to 2016). Currently, he is a Research Assistant Professor of Materials Research Center for Element Strategy in Tokyo Institute of Technology. He has published 30+ SCI papers, including 20 first-author papers published in journals including J. Am. Chem. Soc., Angew. Chem., Adv. Energy Mater., Mater. Horiz., and J. Phys. Chem. Lett. His current research interest focuses on first-principles simulation and design of functional materials including photovoltaic absorbers and inorganic electrides.