Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films

Wang, Qi; Chen, Bo; Liu, Ye; Deng, Yehao; Bai, Yang; Dong, Qingfeng; Huang, Jinsong

doi:10.1039/C6EE02941H

Title: Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films

Journal Article · Sun Jan 01 00:00:00 EST 2017 · Energy & Environmental Science

DOI:https://doi.org/10.1039/C6EE02941H· OSTI ID:1342747

Wang, Qi; Chen, Bo; Liu, Ye; Deng, Yehao; Bai, Yang; Dong, Qingfeng; Huang, Jinsong

The stability of perovskite solar cells has shown a huge variation with respect to the film process and film morphology, while the underlining mechanism for the morphology-dependent degradation of the perovskite film has remained elusive. Herein, we report a scaling behavior of moisture-induced grain degradation in polycrystalline CH₃NH₃PbI₃ films. The degradation rates of CH₃NH₃PbI₃ films in moisture were shown to be sensitive to the grain sizes. The duration that was needed for different films to degrade by the same percent showed a linear relationship with the grain size, despite the fact that the films were formed by five different deposition methods. This scaling behavior can be explained by the degradation along the in-plane direction, which is initiated at the grain boundary (GB). The GBs of CH₃NH₃PbI₃ films consist of an amorphous intergranular layer, which allows quick diffusion of moisture into the perovskite films. It was found that thermal annealing induced surface self-passivation plays a critical role in stabilizing the surfaces of thin films and single crystals by reducing the moisture-sensitive methylammonium ions at the surface. Finally, the determination of the scaling behavior of grain degradation highlights the importance of stabilizing the GBs to improve the stability of perovskite solar cells.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0006709

OSTI ID:: 1342747

Journal Information:: Energy & Environmental Science, Vol. 10, Issue 2; ISSN 1754-5692

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 633 works

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