High-Efficiency, Hysteresis-Less, UV-Stable Perovskite Solar Cells with Cascade ZnO–ZnS Electron Transport Layer

• DOI: 10.1021/jacs.8b11001
• Publication Date: 2018-12-10T15:03:39Z
• Authors: Ruihao Chen; Jing Cao; Yuan Duan; Yong Hui; Tracy T Chuong; Daohui Ou; Faming Han; Fangwen Cheng; Xiaofeng Huang; Binghui Wu; Nanfeng Zheng
• Keywords: Sulfidation; Zinc sulfide; Hysteresis

Perovskite solar cells (PSCs) have reached certified efficiencies of up to 23.7% but suffered from frailness and instability when exposed ambient atmosphere. Zinc oxide (ZnO), used as electron transport layer (ETL) on PSCs, gives rise excellent electronic, optic, photonic properties, yet the Lewis basic nature ZnO surface leads deprotonation perovskite layer, resulting in serious degradation PSCs using ETL. Here, we report a simple effective strategy convert into ZnS at ZnO/perovskite interface by sulfidation. The sulfide ZnO-ZnS binds strongly with Pb2+ creates novel pathway accelerate transfer reduce interfacial charge recombination, yielding champion efficiency 20.7% improved stability no appreciable hysteresis. model devices modified maintained 88% their initial performance for 1000 h under storage condition 87% 500 UV radiation. is demonstrated act both cascade ETL passivating enhancing PSCs.