Molten Salt-Assisted Growth of Perovskite Films with Submillimeter-Sized Grains

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Hou, Yu
Qiao, Hongwei
Yang, Shuang
Li, Chunzhong
Zhao, Huijun
Yang, Hua Gui
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2017
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Abstract

Single crystalline structures with less grain boundaries and longer carrier diffusion length are essential for high performance perovskite solar cells. In this paper, we report a molten salt-assisted method to gain a perovskite film with submillimeter-sized single crystal domains by using excess ammonium salt for the first time. The resulted crystal size can reach 0.5 mm, and an aspect ratio over 1000. A photovoltaic device based on this film exhibits a champion power conversion efficiency (PCE) of 10.12%. This synthetic strategy enables the formation of submillimeter-sized perovskite films first, which holds promise for the understanding of crystallization in organic–inorganic perovskite and paves the way to enhance the efficiency of perovskite solar cells.

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Industrial & Engineering Chemistry Research

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56

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2

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Chemical sciences

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Materials engineering not elsewhere classified

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