Impact of Nickel Oxide/Perovskite Interfacial Contact on the Crystallization and Photovoltaic Performance of Perovskite Solar Cells
Qing Liu, Pin Lv, Yulong Wang, Yanqing Zhu, Min Hu, Fuzhi Huang, Yi‐Bing Cheng, Jianfeng Lu
Abstract
Spray‐coated nickel oxide (NiO X ) is a desirable hole‐transporting material for perovskite solar cells (PSCs) because they are low cost, stable, and readily scalable. Recent research shows that the inferior interface contact of NiO X |perovskite is the main factor that limits the efficiency and stability of the device. Herein, a facile route is introduced to enhance this contact by inserting a tetradecylamine (TeDA) interfacial layer. It is found that TeDA not only can modulate the wettability of NiO X film, thus changing the transformation process of wet film to perovskite, but also can facilitate an efficient charge extraction at this interface. As a result, the efficiency of small‐area (0.16 cm 2 ) solar cells is improved from 15.8% to 18.7%. Moreover, a champion efficiency of 12.9% is achieved for the larger area (53.64 cm 2 ) perovskite solar modules based on spray‐coated NiO X . The optimized devices also show improved stability in comparison with the devices without modification. This work provides a comprehensive understanding of the NiOx|perovskite interface and a new strategy for improving the perovskite quality and photovoltaic performance of PSCs.