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新加坡南洋理工大学邢贵川博士(Research Fellow)、华中科技大学唐江教授
 添加时间:2014/04/09 发布: 管理员




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


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.

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



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,获批中组部第二批青年千人计划和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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