Boosting Tin Perovskite Solar Cell Performance via Light-Induced Interface Doping
Mulin Sun, Zhenzhu Zhao, Hao Xu, Yuan Li, Yuan Li, Junyao Gao, Xiang Fang, Huimin Meng, Yuangan Chen, Tianyu Liu, Xuefei Wu, Zachary Fink, Yu Li, Yu Li, Honghe Ding, Junfa Zhu, Deying Luo, Zhengguo Xiao, Thomas P. Russell, Qin Hu
Abstract
Continuous breakthroughs have been achieved in the photoelectric conversion efficiency (PCE) of tin-based perovskite solar cells (TPSCs) in recent years. Inspired by performance improvements observed during device storage, we identified beneficial light-induced interface doping (LIID) in the TPSCs. In situ analyses using X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy reveal that ion migration and oxidation at the interface induce beneficial doping effects, enhancing carrier transport and significantly boosting device performance. By implementing specific illumination techniques or maximum power point tracking (MPPT) methods to achieve LIID, we increased the open-circuit voltage while maintaining a high short-circuit current, reaching a PCE of up to 14.91%. Furthermore, this efficiency was sustained at 70% of its maximum value after nearly 900 h of continuous operation. Our study introduces a novel approach to addressing energy band mismatch, paving the way for improved efficiency in tin-based perovskite solar cells.