一种Π共轭离子化合物及其应用、钙钛矿薄膜及其制备方法、钙钛矿太阳能电池

本发明属于太阳能电池技术领域，特别涉及一种Π共轭离子化合物及其应用、钙钛矿薄膜及其制备方法、钙钛矿太阳能电池。本发明提供的Π共轭离子化合物阴离子在埋底界面出现富集(电子传输层/钙钛矿界面)，使得Π共轭阳离子贯穿整个钙钛矿薄膜及表面，在钙钛矿薄膜成膜过程中阴阳离子自发分布。在平面异质结钙钛矿太阳能电池中应用该类添加剂，可获得高质量钙钛矿薄膜，同时可改善钙钛矿相邻两个界面的能级匹配程度，减少能量损失，实现高开路电压、高光电转化效率、良好稳定性的钙钛矿太阳能电池。

The invention belongs to the technical field of solar cells, and particularly relates to an n-conjugated ionic compound and application thereof, a perovskite thin film and a preparation method thereof, and a perovskite solar cell. Anions of the pi-conjugated ionic compound provided by the invention are enriched at a buried interface (an electron transport layer/perovskite interface), so that pi-conjugated cations penetrate through the whole perovskite thin film and the surface, and the cations and cations are spontaneously distributed in the film forming process of the perovskite thin film. When the additive is applied to a planar heterojunction perovskite solar cell, a high-quality perovskite thin film can be obtained, and meanwhile, the energy level matching degree of two adjacent interfaces of perovskite can be improved, the energy loss can be reduced, and the perovskite solar cell with high open-circuit voltage, high photoelectric conversion efficiency and good stability can be realized.