报告人简介：

李振声，香港城市大学教授。在1987年和1991分别从香港大学获得硕士和博士学位，此后他通过香港求槎基金的支持到英国伯明翰大学进一步进行学术研究，1994年加入香港城市大学。现在是材料科学专业的讲座讲授。在1998年李振声教授共同发起建立超级金刚石和先进薄膜（COSDAF）研究中心，他现在是中心主任；李振声教授目前研究的重点在：有机电子器件、纳米材料在能源、生物和环境中的应用。

Biography:

Prof Chun-Sing Lee obtained his BSc and PhD degrees from the University of Hong Kong in 1987 and 1991 respectively. He then furthered his research career in the University of Birmingham of UK with the support from a Croucher Foundation Fellowship. He jointed the faculty of the City University of Hong Kong in 1994 and is currently a Chair Professor in materials science. He co-founded the Center Of Super-Diamond and Advanced Films (COSDAF) in 1998 and is now the Center’s Director. Prof Lee’s current research interests include organic electronics devices and nanomaterials for energy, environmental and biomedical applications.

报告摘要：

在过去的几年中，有机金属卤化物钙钛矿材料已经成为了一种重要的光电材料被广泛研究，实际上它和传统的有机半导体材料之间还是有一些共同点的，尤其是钙钛矿材料一些有趣的性能，如：在给体和受体分子间形成的电荷转移复合物具有的铁电性能、超高的双极性性能等等已经在实验中被观察到。有机金属卤化物钛矿高性能的一个重要的原因是，在光激发下有机金属卤化物形成的是自由载流子而不是激子，这个性能也是最近在一些小分子里观察到。这些新的现象能够增加器件结构的设计从而将进一步增强有机金属卤化物钙钛矿太阳能电池的光电转换性能。

Abstract:

Organometallic halide Perovskite has become the most studied photovoltaic materials in the past few years. It in fact shares many common properties with conventional organic semiconductors. In particular, interesting properties of Perovskite such as ferroelectric properties, unusually high ambipolar conductivities etc have been observed in charge transfer complexes formed between certain donor and acceptor molecules. One reason for the high performance of organometallic halide Perovskite is its ability to form free carriers instead of bound excitons upon photon excitation. This property is also recently observed in some small molecules. These new observations enable new designs of device architecture for enhanced solar cell performance.

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