钙钛矿(结构)
化学
图层(电子)
硫化
硫化锌
磁滞
光电子学
化学工程
硫化物
氧化物
材料科学
锌
纳米技术
结晶学
硫黄
有机化学
工程类
物理
量子力学
作者
Ruihao Chen,Jing Cao,Yuan Duan,Hui Yong,Tracy T Chuong,Daohui Ou,Faming Han,Fangwen Cheng,Xiaofeng Huang,Binghui Wu,Nanfeng Zheng
摘要
Perovskite solar cells (PSCs) have reached certified efficiencies of up to 23.7% but suffered from frailness and instability when exposed to ambient atmosphere. Zinc oxide (ZnO), when used as electron transport layer (ETL) on PSCs, gives rise to excellent electronic, optic, and photonic properties, yet the Lewis basic nature of ZnO surface leads to deprotonation of the perovskite layer, resulting in serious degradation of PSCs using ZnO as ETL. Here, we report a simple but effective strategy to convert ZnO surface into ZnS at the ZnO/perovskite interface by sulfidation. The sulfide on ZnO-ZnS surface binds strongly with Pb2+ and creates a novel pathway of electron transport to accelerate electron transfer and reduce interfacial charge recombination, yielding a champion efficiency of 20.7% with improved stability and no appreciable hysteresis. The model devices modified with sulfide maintained 88% of their initial performance for 1000 h under storage condition and 87% for 500 h under UV radiation. ZnS is demonstrated to act as both a cascade ETL and a passivating layer for enhancing the performance of PSCs.
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