【摘要】 钙钛矿材料凭借其优异的性能可作为太阳能器件吸收层而备受关注。针对溶液法制备的钙钛矿吸收层薄膜残留PbI₂问题，提出了去除—钝化—退火3步法策略。首先采用正丁醇与环己烷（体积比为1∶4）的共溶剂对钙钛矿薄膜进行清洗，随后使用含有4-三氟甲氧基苯乙基碘化胺（phenethylammonium iodide with trifluoromethoxy groups,CF₃O-PEAI）的叔戊醇与环己烷（体积比为1∶4）的混合溶液钝化表面，最后进行退火处理。通过该策略不但能有效去除钙钛矿薄膜表面残留PbI₂，且能使晶粒致密性更好、晶粒面积增大，整体优化了表面结晶形貌。制备的器件光电转换效率从17.93%提升至20.59%，相对提高了14.80%。研究结果表明，采用该策略在有效去除残留PbI₂的同时，还能较好地修复清洗后的表面.，最终使器件性能得到了提升。更多还原

【Abstract】 Perovskite materials have attracted significant attentions as the absorbing layers in solar devices due to their outstanding performances.This study addresses the issue of residual PbI₂ in perovskite absorber layers prepared via solution methods.A three-step strategy is presented involving cleaning-passivation-annealing.Firstly,the perovskite films were cleaned with a co-solvent with the volume ratio of n-butanol to cyclohexane of 1∶4.Subsequently,the surface was passivated with a volume ratio of tert-amyl alcohol to cyclohexane solution containing phenethylammonium iodide with trifluoromethoxy groups （CF₃O-PEAI） of 1∶4.Finally,annealing was performed.The strategy not only effectively removes residual lead iodide from the perovskite film surface but also improves grain density and increases the grain area,thereby optimizes the overall surface crystal morphology.The power conversion efficiency of the devices increases from 17.93%to 20.59%with a relative increase of14.80%.The results show that this strategy effectively remove the residual PbI₂ and repair the cleaned surface,and finally improve the performance of the device.更多还原