钙钛矿(结构)
材料科学
氧化铟锡
光电子学
图层(电子)
能量转换效率
工作职能
偶极子
表面能
纳米技术
化学工程
化学
复合材料
工程类
有机化学
作者
Weiguang Kong,Wang Li,Changwen Liu,Hui Liu,Jun Miao,Weijun Wang,Shi Chen,Manman Hu,Dedi Li,Abbas Amini,Shaopeng Yang,Jianbo Wang,Baomin Xu,Chun Cheng
出处
期刊:ACS Nano
[American Chemical Society]
日期:2019-01-25
被引量:27
标识
DOI:10.1021/acsnano.8b07627
摘要
High-efficiency hole transport layer free perovskite solar cells (HTL-free PSCs) with economical and simplified device structure can greatly facilitate the commercialization of PSCs. However, eliminating the key HTL in PSCs results usually in a severe efficiency loss and poor carrier transfer due to the energy-level mismatching at the indium tin oxide (ITO)/perovskite interface. In this study, we solve this issue by introducing an organic monomolecular layer (ML) to raise the effective work function of ITO with the assistance of an interface dipole created by Sn–N bonds. The energy-level alignment at the ITO/perovskite interface is optimized with a barrier-free contact, which favors efficient charge transfer and suppressed nonradiative carrier recombination. The HTL-free PSCs based on the ML-modified ITO yield an efficiency of 19.4%, much higher than those of HTL-free PSCs on bare ITO (10.26%), comparable to state-of-the-art PSCs with a HTL. This study provides an in-depth understanding of the mechanism of interfacial energy-level alignment and facilitates the design of advanced interfacial materials for simplified and efficient PSC devices.
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