有机无机掺杂钙钛矿太阳能电池界面的光氧失稳机理研究
葛杨1，2，卢岳1，2*，隋曼龄1，2*
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（1.北京工业大学，固体微结构与性能研究所，北京 100124；2.北京工业大学固体微结构与性能北京市重点实验室，北京100124)
摘要 有机无机杂化钙钛矿材料因其优异的光电性能在光伏领域引起了广泛关注并获得巨大的发展。但钙钛矿太阳能电池在环境条件下的稳定性，尤其是光稳定性，严重限制了它的商业化应用。本文基于透射电子显微学的微观形貌结构及元素成分的表征，并结合性能参数的测试，详细研究了有机无机杂化钙钛矿太阳能电池在空气中光照条件下的衰退过程。研究结果表明，在光照条件下，钙钛矿太阳能电池内部形成的光生电压会诱导如碘离子等离子的迁移，而离子的迁移会造成钙钛矿层内元素分布不均匀，同时也会导致金属电极被腐蚀进而形成孔洞。另外，空气中氧气也会进入电池当中并导致钙钛矿层与电子传输层的界面处出现严重降解，并形成孔洞，从而影响了界面处的载流子传输，导致电流密度下降，进而影响电池的转换效率。
关键词 钙钛矿太阳能电池；光照；衰退机制；透射电子显微镜
中图分类号：TM914；TG115.21+5.3 文献标识码：A doi:10.3969/j.issn.1000-6281.2019.06.002
Photo-oxidative instability mechanism of organic-inorganic hybrid perovskite solar cell at interface
GE Yang1，2, LU Yue1，2*, SUI Manling1，2*
(1. Beijing University of Technology, Institute of Microstructure and Property of Advanced Materials, Beijing 100124, China；2. Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China)
Abstract Organic-inorganic hybrid perovskite materials have attracted extensive attention and get great development in the field of photovoltaics due to their excellent optoelectronic properties. However, the stability of perovskite solar cells under light illumination in ambient conditions severely limits its commercial application. In this paper, the degradation process of organic-inorganic hybrid perovskite solar cells under light illumination in airhad been studied in detailsby advanced Cs-corrected transmission electron microscopycombining withJ-V test. The results showed that the photo-generated voltage formed inside the perovskite solar cellsunder light illuminationwould induce the migration of ions such as iodide ions. Then the migration of ions caused uneven distribution of elements in the perovskite layer, and also resulted inthe corrosion of the metal electrode. In addition, oxygen would diffuse into the perovskite solar cell to cause severe degradation of many holes at the interface between the perovskite layer and the electron transport layer, which further affected the transport of charge carrier at the interface to result in a decrease of current density and photoelectric conversion efficiency.
Keywords perovskite solar cell; light illumination; degradation mechanism; transmission electron microscopy
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