时间：2014年4月8日09:30
地点：科技创新大楼五楼报告厅
演讲学者：南洋理工大学邢贵川博士（Research Fellow）
演讲标题：Ultrafast nonlinear spectroscopy investigation of perovskites for light harvesting and lasing
Abstract:
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 3rdgeneration 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 CH3NH3PbX3perovskites 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.
Short Biography:
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.
演讲学者：华中科技大学 唐江 教授
演讲标题：无机化合物薄膜太阳能电池
报告摘要：太阳能发电具有储量大、安全绿色无污染的优势，是解决当前中国能源和环境问题的潜在手段之一。本报告先对太阳能发电进行概述，然后简要介绍本人在硫化铅量子点太阳能电池研究方面的一些结果，最后介绍本课题组在无机化合物薄膜太阳能电池的最新进展：水溶液法制备铜锌锡硫硒太阳能电池；以及新型低毒低成本的硒化锑太阳能电池的材料、器件和制备工艺研究。
唐江，男，华中科技大学武汉光电国家实验室（筹）教授，能源光电子功能实验室副主任。2003年本科毕业于中国科学技术大学化学物理系，2010年博士毕业于多伦多大学材料科学与工程系，2011年进入IBM沃森研究总部(T. J. Watson Research Center)进行博士后研究，2012年加入华中科技大学任教授。已在Nat. Mater.,Nat. Photonics, Adv. Mater., Adv. Energ. Mater.等杂志发表文章30余篇，被引用1200余次，获批国家自然科学基金委优秀青年基金。一直从事太阳能电池研究，在博士和博后研究期间取得量子点太阳能电池和铜锌锡硫硒薄膜太阳能电池效率世界纪录各一项；回国后致力于发展新型高效无毒低成本无机化合物薄膜太阳能电池及其制备设备开发。
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