溶剂热处理法制备的钙钛矿CH_(3)NH_(3)PbI_(3)薄膜的微观形貌与电池性能的研究  

Research on micro-morphology and battery performance of perovskite CH_(3)NH_(3)PbI_(3) films prepared by solvent heat treatment method

作　　者：邹函君[1] 杨文达 常秋翔 张潇 张斌[1] ZOU Han-jun;YANG Wen-da;CHANG Qiu-xiang;ZHANG Xiao;ZHANG Bin(Analytical and Testing Center,Chongqing University,Chongqing 400030,China)

机构地区：[1]重庆大学分析测试中心,重庆400030

出　　处：《电子显微学报》2021年第2期116-120,共5页Journal of Chinese Electron Microscopy Society

基　　金：重庆市自然科学基金面上项目(No.cstc2019jcyj-msxmX0554)。

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CH_(3)NH_(3)PbI_(3)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CH_(3)NH_(3)PbI_(3)薄膜平均晶粒尺寸接近3μm,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。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 the grain 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 CH_(3)NH_(3)PbI_(3) 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 CH_(3)NH_(3)PbI_(3) films prepared by solvent heat treatment method was close to 3μm,which was significantly larger than that of the film prepared by ordinary heat treatment method(about 300 nm).

关 键 词：钙钛矿CH_(3)NH_(3)PbI_(3) 溶剂热处理 微观形貌 电池性能 

分 类 号：TM914[电气工程—电力电子与电力传动] TK514[动力工程及工程热物理—热能工程]