Zheng Wenwen, Xia Tian, Zhang Xueqi, Han Junzhe, Li Yingying, Tian Nan, Zheng Guoyuan, Wang Jilin, Peng Yong, Yao Disheng, Long Fei
Guangxi Key Laboratory of Optical and Electronic Material and Devices, School of Materials Science and Engineering, Guilin University of Technology, 12 Jiangan Road, Guilin, Guangxi 541004, China.
School of Materials Science and Engineering, Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, Guilin 541004, China.
ACS Appl Mater Interfaces. 2024 Dec 4;16(48):66643-66654. doi: 10.1021/acsami.4c12455. Epub 2024 Nov 19.
The post-treatment based on spin-coating (SC) organic amine salts is commonly used for surface modification of perovskite films to eliminate defects. However, there is still a lack of systematic study and a unified understanding of the functions and mechanisms of different organic amine salts. The SC method is also not conducive to the industrialization of solar cells. In this work, we study three different organic amine salts, and a passivation strategy for perovskite films based on green anisole liquid soaking (ALS) has been developed. Phenylethylammonium iodide (PEAI), diethylamine hydroiodide (DEAI), and guanidine hydroiodide (GAI) organic amine salt passivators are selected to modify perovskite films, and their effect and working mechanism are also systematically estimated. It is found that PEAI passivates shallow-level defects on the surface of perovskite films, while DEAI incorporates into the perovskite lattice to suppress point defects, and GAI eliminates excess PbI residuals in perovskite films. These three organic-amine-salt-modified devices achieve enhanced power conversion efficiencies (PCE) of 21.82% (PEAI-ALS), 21.74% (DEAI-ALS), and 22.21% (GAI-ALS), which is much higher than that of the pristine device without treatment (19.95%). The PCE of the PEAI-ALS device retains nearly 94% of the initial efficiency after 1200 h in unpackaged conditions and about 40% ambient humidity, achieving the best stability performance. Particularly, the PEAI-ALS device has the best comprehensive performance in efficiency and stability. And PEAI is estimated by the SC method and ALS method, and it is found that the PEAI-ALS device achieves a higher PCE compared to the PEAI-SC device (21.51%). We believe that the post-treatment based on a combination of appropriate amine salts and ALS enables a universal approach for fabrication of perovskite solar cells with enhanced photovoltaic performance.
基于旋涂（SC）有机胺盐的后处理通常用于钙钛矿薄膜的表面改性以消除缺陷。然而，对于不同有机胺盐的功能和机制仍缺乏系统研究和统一认识。SC方法也不利于太阳能电池的工业化。在这项工作中，我们研究了三种不同的有机胺盐，并开发了一种基于绿色茴香醚液体浸泡（ALS）的钙钛矿薄膜钝化策略。选择苯乙铵碘化物（PEAI）、氢碘酸二乙胺（DEAI）和氢碘酸胍（GAI）有机胺盐钝化剂来修饰钙钛矿薄膜，并系统地评估了它们的效果和作用机制。发现PEAI钝化钙钛矿薄膜表面的浅能级缺陷，而DEAI掺入钙钛矿晶格以抑制点缺陷，GAI消除钙钛矿薄膜中过量的PbI残余物。这三种有机胺盐改性的器件实现了增强的功率转换效率（PCE），分别为21.82%（PEAI-ALS）、21.74%（DEAI-ALS）和22.21%（GAI-ALS），远高于未经处理的原始器件（19.95%）。PEAI-ALS器件在未封装条件下和大约40%环境湿度下1200小时后，PCE保留了初始效率的近94%，实现了最佳的稳定性性能。特别是，PEAI-ALS器件在效率和稳定性方面具有最佳的综合性能。并且对PEAI采用SC方法和ALS方法进行评估，发现与PEAI-SC器件（21.51%）相比，PEAI-ALS器件实现了更高的PCE。我们相信，基于适当胺盐和ALS组合的后处理为制造具有增强光伏性能的钙钛矿太阳能电池提供了一种通用方法。
