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Vertical recrystallization for highly efficient and stable formamidinium-based inverted-structure perovskite solar cells

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Abstract

Formamidinium (FA)-based perovskite materials show an extended absorption spectrum to 840 nm, which enables high power conversion efficiencies of over 20% compared with normal-structure perovskite solar cells (PSCs). However, it is rarely possible to obtain high performance in inverted-structure PSCs owing to the unbalanced electron–hole transport properties. To achieve desirable electronic qualities in a FA perovskite film, it is necessary to substantially improve the crystallinity of the perovskite films. A new perovskite growth method is presented here using methylammonium chloride (MACl) to assist vertical recrystallization in a formamidinium perovskite film. The obtained film consists of highly crystallized vertically-orientated grains, which minimize the vertical grain boundary and trap site in the films, and later contribute to a power conversion efficiency above 20% in inverted-structure PSCs. Most importantly, the highly crystalline, phase-pure morphology and low MA content in formamidinium perovskite films can contribute to the light-soaking stability and thermal stability up to 500 h in solar-cell devices.

Graphical abstract: Vertical recrystallization for highly efficient and stable formamidinium-based inverted-structure perovskite solar cells

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Publication details

The article was received on 15 Jun 2017, accepted on 25 Jul 2017 and first published on 25 Jul 2017


Article type: Communication
DOI: 10.1039/C7EE01675A
Citation: Energy Environ. Sci., 2017, Advance Article
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    Vertical recrystallization for highly efficient and stable formamidinium-based inverted-structure perovskite solar cells

    F. Xie, C. Chen, Y. Wu, X. Li, M. Cai, X. Liu, X. Yang and L. Han, Energy Environ. Sci., 2017, Advance Article , DOI: 10.1039/C7EE01675A

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