Functionalization of perovskite thin films with moisture-tolerant molecules

Shuang Yang, Yun Wang, Porun Liu, Yi-Bing Cheng, Hui Jun Zhao () and Hua Gui Yang ()
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Shuang Yang: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology
Yun Wang: Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University
Porun Liu: Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University
Yi-Bing Cheng: Monash University
Hui Jun Zhao: Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University
Hua Gui Yang: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology

Nature Energy, 2016, vol. 1, issue 2, 1-7

Abstract: Abstract Organic–inorganic hybrid perovskites are particularly suited as light-harvesting materials in photovoltaic devices. The power conversion efficiency of perovskite solar cells has reached certified values of over 20% in just a few years. However, one of the major hindrances for application of these materials in real-world devices is the performance degradation in humid conditions, leading to a rapid loss of photovoltaic response. Here, we demonstrate that hydrophobic tertiary and quaternary alkyl ammonium cations can be successfully assembled on the perovskite surface as efficient water-resisting layers via a facile surface functionalization technique. Such layers can protect the perovskite film under high relative humidity (90 ± 5%) over 30 days. More importantly, devices based on such films can retain the photovoltaic capacities of bulk perovskites, with power conversion efficiencies over 15%. Improving the humidity tolerance of perovskite materials is a necessary step towards large-scale production of high-performance perovskite-based devices under ambient humidity.

Date: 2016
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DOI: 10.1038/nenergy.2015.16

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