有机金属卤化物钙钛矿与传统有机半导体材料之间的相似点

Similarities Between Organometallic Halide Perovskite and Conventional Organic Semiconductors

有机金属卤化物钙钛矿材料已经成为一种重要的光电材料,和传统的有机半导体材料之间存在共同点,尤其是钙钛矿材料在给体和受体分子间形成的电荷转移复合物所具有的铁电性能、超高的双极性等性能已经在实验中被观察到。分析得出有机金属卤化物钙钛矿高性能的一个重要原因是: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,这个性能在近期的一些小分子里被验证。新现象的发现有利于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。

Organometallic halide perovskite has become the most studied photovoltaic material 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.