基于有机胺盐表面修饰的CsPbI_(3)全无机钙钛矿太阳能电池性能的提升  

Enhancement of the performance of CsPbI_(3)all-inorganic perovskite solar cells based on organic ammonium salt surface modification

作　　者：柳宇 徐凌波 崔灿[1] LIU Yu;XU Lingbo;CUI Can(School of Science,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学理学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2024年第2期145-152,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(61704154)。

摘　　要：有机胺盐表面修饰是钙钛矿太阳能电池中钝化钙钛矿表面缺陷和提升电池稳定性的有效方法。旋涂苯乙基碘化铵(phenylethylammonium iodide,PEAI)和四丁基碘化铵(tetrabutylammonium iodide,TBAI)溶液在CsPbI_(3)钙钛矿薄膜表面并进行热处理,修饰钙钛矿表面,采用X射线衍射仪、扫描电镜、稳态-瞬态荧光寿命光谱仪对薄膜的结构形貌和光电性能进行表征分析,通过电流密度-电压测试、电化学阻抗测试和暗态电流密度-电压测试对比两种表面修饰剂对CsPbI_(3)钙钛矿薄膜和器件性能的影响。结果表明:PEAI不能与CsPbI_(3)发生离子交换生成低维钙钛矿,仅通过吸附在表面钝化缺陷并阻碍水汽侵入,提升薄膜的稳定性;而TBAI可有效进入无机CsPbI_(3)钙钛矿晶格,形成低维钙钛矿相,进而改善薄膜形貌、钝化缺陷并提升薄膜的稳定性;TBAI修饰的电池器件光电转换效率相较于PEAI修饰的器件提升了8.5%,同时器件的稳定性也得到了增强。该研究为开发适用于全无机CsPbI_(3)钙钛矿的新型表面修饰剂提供了指导和方向。The surface modification of organic amine salt is an effective method to passivate the surface defects of perovskite and improve the stability of perovskite solar cells.The perovskite surface was modified by spin coating phenylethylammonium iodide(PEAI)and tetrabutylammonium iodide(TBAI)solution on the surface of CsPbI_(3)perovskite film and heat treatment.X-ray diffraction test,scanning electron microscope test and photoluminescence test were used to characterize the structural morphology and photoelectric properties of the films.The photoelectric properties of the battery devices were analyzed by current-voltage test,electrochemical impedance test and dark state current-voltage test,and the effects of two surface modifiers on the properties of CsPbI_(3)perovskite films and devices were compared.The results show that PEAI cannot exchange ions with CsPbI_(3)to generate low-dimensional perovskite,and can only adsorb on the surface to passivate the defects and prevent water vapor intrusion,so as to improve the stability of the film.TBAI can effectively enter the inorganic CsPbI_(3)perovskite lattice to form lowdimensional perovskite phase,and then improve the morphology,passivation defects and stability of the film.The photoelectric conversion efficiency of the TBAI-modified battery device is 8.5%higher than that of the PEAI-modified battery device,and the stability of the device is also enhanced.This study indicates the direction for developing new surface modifiers suitable for all-inorganic CsPbI_(3)perovskite.

关 键 词：表面修饰 四丁基碘化铵 苯乙基碘化铵 稳定性 CsPbI_(3) 光电性能 

分 类 号：TM914.4[电气工程—电力电子与电力传动]