Moisture assisted perovskite film growth for high performance solar cells

Jingbi You(University of California, Los Angeles), Yang Yang(California NanoSystems Institute), Ziruo Hong(University of California, Los Angeles), Tze‐Bin Song(University of California, Los Angeles), Lei Meng(University of California, Los Angeles), Yongsheng Liu(University of California, Los Angeles), Chengyang Jiang(University of California, Los Angeles), Huanping Zhou(University of California, Los Angeles), Wei‐Hsuan Chang(University of California, Los Angeles), Gang Li(University of California, Los Angeles), Yang Yang(California NanoSystems Institute)
Applied Physics Letters
November 3, 2014
10.1063/1.4901510
Cited by 773Open Access
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Abstract

Moisture is assumed to be detrimental to organometal trihalide perovskite, as excess water can damage the crystallinity of the perovskite structure. Here, we report a growth mode for via thermal annealing of the perovskite precursor film in a humid environment (e.g., ambient air) to greatly improve the film quality, grain size, carrier mobility, and lifetime. Our method produces devices with maximum power conversion efficiency of 17.1% and a fill factor of 80%, revealing a promising route to achieve high quality perovskite polycrystalline films with superior optoelectronic properties that can pave the way towards efficient photovoltaic conversion.

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