离子液体对钙钛矿太阳能电池性能的影响

摘要

利用1-乙基-3-甲基咪唑溴盐(EMIMBr)、1-己基-3-甲基咪唑溴盐(HMIMBr)、双三氟甲烷磺酰亚胺锂(LiTFSI)以及1-乙基-3-甲基咪唑氯盐(EMICl)和双氟磺酰亚胺钾(KFSI)制备了1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐(EMITFSI)、1-己基-3-甲基咪唑双三氟甲磺酰亚胺盐(HMITFSI)和1-乙基-3-甲基咪唑鎓二(氟甲磺酰基)亚胺盐(EMIFSI)3种离子液体.用氯苯稀释的离子液体对钙钛矿活性层进行浸泡处理,探究了离子液体对钙钛矿形貌以及钙钛矿太阳能电池性能的影响.结果表明,HMITFSI处理后太阳能电池的填充因子从0.71提高到了0.74,光电转换效率也有了一定提高,钙钛矿薄膜的表面形貌得到了改善,而EMITFSI 和EMIFSI的处理反而降低了钙钛矿太阳能电池的性能,证实离子液体可以影响钙钛矿的结晶形貌.%Controling the morphology of the perovskite film is an effective way to improve the photoelectric conversion efficiency of the cells.In this work,1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide(EMITFSI), 1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide(HMITFSI)and 1-ethyl-3-methy-limidazolium bis(fluorosulfonyl)imide(EMIFSI)were prepared.Perovskite active layers were dealed with ionic liquid dispersed into the chlorobenzene solution,the morphology of the perovskite layer and the performance of perovskite solar cells were investigated.The results indicate that the fill factor of perovskite solar cells dealed with HMITFSI is enhanced from 0.71 to 0.74, and the photoelectric conversion efficiency is increased,and that the morphology of perovskite is also improved.However,the performance of perovskite solar cells dealed with EMITFSI and EMIFSI are declined.It is HMI cation that improves the morphology of perovskite.