Dong Haiyue, Wang Jilin, Li Xingyu, Liu Weiting, Xia Tian, Yao Disheng, Zhang Lixiu, Zuo Chuantian, Ding Liming, 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.
Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, 12 Jiangan Road, Guilin, Guangxi 541004, China.
ACS Appl Mater Interfaces. 2022 Jul 12. doi: 10.1021/acsami.2c08662.
Modification of the charge transport layers is an effective way to improve charge transport and performance of perovskite solar cells (PSCs). The ions in the ionic compounds used for the modification of SnO may migrate into the perovskite layer, which harms the stability of PSCs. In this work, a low-cost, water-soluble nonionic polymer polyacrylamide (PAM) is used to modify SnO. The addition of PAM improves the uniformity, wettability, and electron mobility of the SnO film. Through the modification of SnO, the defects of perovskite films are reduced and the grain size is increased. Furthermore, the energy-level alignment at the SnO/perovskite interface is improved, which is beneficial to the transfer of electrons from perovskite to SnO. Finally, the power conversion efficiency (PCE) of PSCs formed from modified SnO is enhanced to 22.59%. More importantly, the unencapsulated devices with modified SnO retain 90% of the initial value after storage for more than 1000 h under a relative humidity of 50%. These results indicate that modifying SnO using PAM is a promising strategy to improve the performance of PSCs.
修饰电荷传输层是提高钙钛矿太阳能电池（PSC）电荷传输和性能的有效方法。用于修饰SnO的离子化合物中的离子可能会迁移到钙钛矿层中，这会损害PSC的稳定性。在这项工作中，一种低成本的水溶性非离子聚合物聚丙烯酰胺（PAM）被用于修饰SnO。PAM的添加提高了SnO薄膜的均匀性、润湿性和电子迁移率。通过对SnO的修饰，钙钛矿薄膜的缺陷减少，晶粒尺寸增大。此外，SnO/钙钛矿界面处的能级排列得到改善，这有利于电子从钙钛矿转移到SnO。最终，由修饰后的SnO制成的PSC的功率转换效率（PCE）提高到了22.59%。更重要的是，具有修饰后SnO的未封装器件在50%相对湿度下储存1000多小时后仍保留初始值的90%。这些结果表明，使用PAM修饰SnO是提高PSC性能的一种有前景的策略。
