Yang Shuzhang, Wang Liang, Gao Liguo, Cao Junmei, Han Qianji, Yu Fengyang, Kamata Yusuke, Zhang Chu, Fan Meiqiang, Wei Guoying, Ma Tingli
Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 804-8550, Japan.
State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin 124221, P.R. China.
ACS Appl Mater Interfaces. 2020 Mar 25;12(12):13931-13940. doi: 10.1021/acsami.9b23532. Epub 2020 Mar 11.
All-inorganic lead halide perovskite solar cells (PSCs) have drawn widespread interest because of its excellent thermal stability compared to its organic-inorganic hybrid counterpart. Poor phase stability caused by moisture, however, has thus far limited their commercial application. Herein, by modifying the interface between the hole-transport layer (HTL) and the perovskite light absorption layer, and by optimizing the HTL for better energy alignment, we controlled the growth of perovskite, reduced carrier recombination, facilitated carrier injection and transport, and improved the PSC's power conversion efficiency (PCE) and moisture stability. When testing using a positive bias scan, we obtained a significant improvement in PCE, 9.49%, which is the champion efficiency of CsPbIBr-based inverted PSC at present. The stability measurement shows that the passivated CsPbIBr-based inverted PSCs can retain 86% of its initial efficiency after 1000 h preserved in ambient air with 65% relative humidity. This study paves a new way for enhancing the moisture stability and power conversion efficiency of CsPbIBr-based PSCs.
全无机铅卤化物钙钛矿太阳能电池（PSC）因其与有机-无机杂化同类电池相比具有出色的热稳定性而引起了广泛关注。然而，迄今为止，由水分导致的较差的相稳定性限制了它们的商业应用。在此，通过修饰空穴传输层（HTL）与钙钛矿光吸收层之间的界面，并通过优化HTL以实现更好的能量匹配，我们控制了钙钛矿的生长，减少了载流子复合，促进了载流子注入和传输，并提高了PSC的功率转换效率（PCE）和湿度稳定性。当使用正向偏压扫描进行测试时，我们在PCE方面取得了显著提高，达到了9.49%，这是目前基于CsPbIBr的倒置PSC的最佳效率。稳定性测量表明，经过钝化处理的基于CsPbIBr的倒置PSC在相对湿度为65%的环境空气中保存1000小时后，仍可保留其初始效率的86%。本研究为提高基于CsPbIBr的PSC的湿度稳定性和功率转换效率开辟了一条新途径。
