邢贵川博士
新加坡南洋理工
报告时间：4月9日（周三）上午10:00
报告地址：唐仲英楼A213
报告摘要：
Organo-metal trihalide perovskite is a new class of materials being widely explored in the area of energy harvesting. Reports of high efficiency solar cells (~16%, far surpassing other 3rd generation technologies) which are fabricated under mild conditions are driving a revolution in the area of photovoltaics. Low temperature solar cell fabrication is essential to reduce the energy payback time associated with solar cells as well as to unlock applications. Typical low temperature processed solar cells consist of organic semiconductors and quantum dots which suffer from disadvantages related to charge transport, stability, recombination and performance. Organic-inorganic halide perovskites provide a superior alternative.
By applying femtosecond transient optical spectroscopy to bilayers which interface this CH3NH3PbX3 perovskites with either selective-electron or selective-hole extraction materials, we have uncovered concrete evidence of balanced long-range electron-hole diffusion lengths of at least 100 nanometers in this solution processed materials. The high photoconversion efficiencies of these systems stem from the comparable optical absorption length and charge-carrier diffusion lengths, transcending the traditional constraints of solution-processed semiconductors. The fundamental findings on technologically relevant materials have culminated in spin-off discoveries of novel phenomena such as lasing in these perovskites.
报告人简介：
Dr. Xing Guichuan received his PhD from National University of Singapore in 2011. Since then he has worked as a post-doctoral researcher at Nanyang Technological University. He has more than 30 scientific publications and 1 patent. Dr. Xing Guichuan has contributed greatly to understanding of the working principles of low-temperature solution-processed organic-inorganic trihalide perovskite solar cells. He is particularly interested in developing and applying ultrafast nonlinear spectroscopic techniques to a variety of important optoelectronic systems for both fundamental physical studies and applications.