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

Abstract

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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1342747
Grant/Contract Number:  
EE0006709
Resource Type:
Accepted Manuscript
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 10; Journal Issue: 2; Journal ID: ISSN 1754-5692
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wang, Qi, Chen, Bo, Liu, Ye, Deng, Yehao, Bai, Yang, Dong, Qingfeng, and Huang, Jinsong. Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films. United States: N. p., 2017. Web. doi:10.1039/C6EE02941H.
Wang, Qi, Chen, Bo, Liu, Ye, Deng, Yehao, Bai, Yang, Dong, Qingfeng, & Huang, Jinsong. Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films. United States. doi:10.1039/C6EE02941H.
Wang, Qi, Chen, Bo, Liu, Ye, Deng, Yehao, Bai, Yang, Dong, Qingfeng, and Huang, Jinsong. Sun . "Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films". United States. doi:10.1039/C6EE02941H. https://www.osti.gov/servlets/purl/1342747.
@article{osti_1342747,
title = {Scaling behavior of moisture-induced grain degradation in polycrystalline hybrid perovskite thin films},
author = {Wang, Qi and Chen, Bo and Liu, Ye and Deng, Yehao and Bai, Yang and Dong, Qingfeng and Huang, Jinsong},
abstractNote = {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.},
doi = {10.1039/C6EE02941H},
journal = {Energy & Environmental Science},
number = 2,
volume = 10,
place = {United States},
year = {2017},
month = {1}
}

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    Works referencing / citing this record:

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