Interfacial-engineering enhanced performance and stability of ZnO nanowire-based perovskite solar cells
Junlu Sun, Nengxu Li, Lin Dong, Xiuxiu Niu, Mengqi Zhao, Ziqi Xu, Ning Zhou, Chongxin Shan, Caofeng Pan
Abstract
Abstract Perovskite solar cells (PSCs) have attracted extensive attention due to their convenient fabrication and excellent photoelectric characteristics. The highest power conversion efficiency (PCE) of over 25% has been realized. However, ZnO as electron transport layer based PSCs exhibit inferior PCE and stability because of the mismatched energy-band and undesirable interfacial recombination. Here, we introduce a thin layer of SnO 2 nanocrystals to construct an interfacial engineering with gradient energy band and interfacial passivation via a facile wet chemical process at a low temperature. The best PCE obtained in this study reaches 18.36%, and the stability is substantially improved and maintains a PCE of almost 100% over 500 h. The low-temperature fabrication process facilitates the future application of ZnO/SnO 2 -based PSCs in flexible and stretchable electronics.