溶剂热处理法制备的钙钛矿CH3NH3PbI3薄膜的微观形貌与电池性能的研究

溶剂热处理法制备的钙钛矿CH₃NH₃PbI₃薄膜的微观形貌与电池性能的研究

邹函君，杨文达，常秋翔，张 潇，张 斌

（重庆大学分析测试中心，重庆400030）

摘  要  近年来研究表明，通过增大晶粒尺寸和减少晶界数量可以有效减小钙钛矿太阳能电池的漏电流和增大并联电阻，极大地增加其能量转化效率。溶剂热处理工艺是一种利用溶解再结晶的原理增大薄膜晶粒的实用工艺，可用于制备大晶粒高质量的多晶薄膜。本文制备了不同溶剂热处理时长的旋涂制备的钙钛矿CH₃NH₃PbI₃薄膜，利用SEM和XRD分析了其形貌和晶体结构的变化，探索了薄膜晶粒形貌与电池性能的对应关系，应用优化后的溶剂热处理工艺成功制备出大晶粒、高性能的钙钛矿薄膜。实验表明，溶剂热处理法制备的钙钛矿CH₃NH₃PbI₃薄膜平均晶粒尺寸接近3 µm，较普通热处理方法制备的薄膜晶粒尺寸（约300 nm）有显著增大。

关键词  钙钛矿CH₃NH₃PbI₃；溶剂热处理；微观形貌；电池性能

中图分类号：O6-32    文献标识码：B   doi:10.3969/j.issn.1000-6281.2021.02.003

Research onmicro-morphology and battery performance of perovskite CH₃NH₃PbI₃films prepared by solvent heat treatment method

ZOU Han-jun，YANG Wen-da，CHANG Qiu-xiang，ZHANG Xiao，ZHANG bin

（Analytical and Testing Center, Chongqing University, Chongqing 400030, China）

Abstract  Recent studies have shown that enlarging grain size and reducing grain boundaries can reduce the leakage current and increase the shunt resistance for perovskite solar cell, thus effectively enhance the power conversion efficiency（PCE）. Solvent thermal treatment method was a practical heat treatment process to promote thegrain size enlargement of perovskite films based on the principle of solution and recrystallization, which could be used for the preparation of polycrystalline thin films with large grains and high quality. In this paper, perovskite CH₃NH₃PbI₃ films were prepared by spin coating in different solvent heat treatment times, the changes of morphology and crystal structure were analyzed by SEM and XRD. The corresponding relationship between the grain morphology of the film and the battery performance was explored, and large grain and high-performance perovskite films by the optimized solvent heat treatment process were prepared successfully. The results showed that the average grain size of perovskite CH₃NH₃PbI₃ films prepared by solvent heat treatment method was close to 3 µm, which was significantly larger than that of the film prepared by ordinary heat treatment method (about 300 nm).

Keywords   perovskite CH₃NH₃PbI₃；solvent thermal treatment；micro-morphology；battery performance

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