title: Engineering of electron-selective contact for perovskite solar cells with efficiency exceeding 15%.
abstract: The past 5 years have witnessed the rise of highly efficient organometal halide perovskite-based solar cells. In conventional perovskite solar cells, compact n-type metal oxide film is always required as a blocking layer on the transparent conducting oxide (TCO) substrate for efficient electron-selective contact. In this work, an interface engineering approach is demonstrated to avoid the deposition of compact n-type metal oxide blocking film. Alkali salt solution was used to modify the TCO surface to achieve the optimized interface energy level alignment, resulting in efficient electron-selective contact. A remarkable power conversion efficiency of 15.1% was achieved under AM 1.5 G 100 mW · cm(-2) irradiation without the use of compact n-type metal oxide blocking layers.
authors.affiliation: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University , Beijing 100871, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Hu
authors.forename: Jiang
authors.initials: J
authors.lastname: Wu
authors.forename: Chang
authors.initials: C
authors.lastname: Jiang
authors.forename: Tanghao
authors.initials: T
authors.lastname: Liu
authors.forename: Xinglu
authors.initials: X
authors.lastname: Que
authors.forename: Rui
authors.initials: R
authors.lastname: Zhu
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong
keywords: electron-selective contact; interface engineering; perovskite solar cells