Ion-Migration Inhibitor for Spiro-OMeTAD/Perovskite Contact toward Stable Perovskite Solar Cells

作者：Jiazhe Xu, Pengju Shi, Ke Zhao, Libing Yao, Caner Değer, Sisi Wang, Xu Zhang, Shaochen Zhang, Yuan Tian, Xiaonan Wang, Jiahui Shen, Chao Zhang, İlhan Yavuz, Jingjing Xue, Rui Wang · 发表于：ACS Energy Letters · 年份：2024 · DOI：10.1021/acsenergylett.4c00049 · 被引用次数：78 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Organic Light-Emitting Diodes Research

Dopants are utilized to enhance the mobility and optimize energy levels of hole-transporting layers in perovskite solar cells (PSCs), which are crucial to achieving high power conversion efficiencies (PCEs) of normal PSCs. However, the traditional method of doping 2,2′,7,7′-tetrakis( N,N -di(4-methoxyphenyl)amino)-9,9-spirobifluorene (Spiro-OMeTAD) with lithium bis(trifluoromethylsulfonyl)imide (Li-TFSI) can cause inward migration of Li-ions to perovskite, which is one of the main factors affecting the long-term stability of PSCs. In this study, we utilized a multifunctional ion-migration inhibitor at the Spiro-OMeTAD/perovskite interface to control ion migration. As a result, both Spiro-OMeTAD and perovskite were safeguarded and the device’s operational stability was enhanced. The optimized devices with 4-methanesulfonyl-benzamidine hydrochloride exhibited an improved PCE of up to 25.3%. Meanwhile, we documented 520-h T 90 under continuous 1-sun illumination, 740-h T 80 heating at 60 ± 5 °C, and 1000-h T 92 at maximum power point tracking at 50 ± 5 °C under continuous 1-sun illumination.