多孔Pb基前驱体的构建对钙钛矿薄膜质量及光伏性能的影响研究  

Construction of porous Pb-related precursor and its influence on perovskite films and device performance

作　　者：范琳[1] 王鹏飞 杨景海[1] 王奉友 杨梅芳 张玉红 庞振宇[1] 孙岩森 AN Lin;WANG Peng-fei;YANG Jing-hai;WANG Feng-you;YANG Mei-fang;ZHANG Yu-hong;PANG Zhen-yu;SUN Yan-sen(College of Physics,Jilin Normal University,Siping 136000,China)

机构地区：[1]吉林师范大学物理学院,吉林四平136000

出　　处：《吉林师范大学学报（自然科学版）》2019年第1期32-39,共8页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(61475063);吉林省科技发展计划项目(20180519016JH);吉林省教育厅"十三五"科学技术项目(JJKH20190998KJ)

摘　　要：钙钛矿薄膜较大的晶粒尺寸、均匀的表面形貌以及较少的缺陷态是获得高效钙钛矿太阳电池的关键因素.采用PCBM修饰致密TiO_2电子传输层(ETL)表面,利用PCBM自身柔韧性促进形成疏松、多孔的Pb基前驱体薄膜,该结构有利于后续MAI溶液的充分渗透并为前驱体反应形成钙钛矿所必经的应力释放和晶体膨胀过程提供充分空间,从而获得高质量的大晶粒钙钛矿光吸收层.另外,将PbCl_2引入Pb基前驱体中可优化得到多孔骨架结构的PbICl前驱体薄膜,且钙钛矿薄膜中存在的非晶态PbCl_2可有效钝化材料缺陷,显著提高薄膜电学特性及整个电池性能.Perovskite film with large grain size,uniform morphology and less trap stats is one of the key requirements for high efficient solar cells.In this work,it has been found that PCBM incorporation above electron transporting layer(ETL)can promote the formation of porous Pb-related precursor film with loose structure due to its elastic nature.This precursor film plays a key role in high quality perovskite films realization benefiting from an effective stress release during structure expansion after methylammonium iodide dripping.Moreover,PbCl2 has also been introduced in the Pb-related precursor,and it has been demonstrated that the formation of porous PbICl scaffold in the precursor film.It's also worth mentioning that residual amorphous PbCl2 can effectively passivate defects in perovskite film,and dramatically improve film electrical properties and device performance.

关 键 词：Pb基前驱体薄膜 多孔骨架PbICl 高质量钙钛矿薄膜 两步旋涂法 钙钛矿太阳电池 

分 类 号：O472[理学—半导体物理]