Efficient perovskite solar cellsviasurface passivation by a multifunctional small organic ionic compound

Xin Wu; Lu Zhang; Zhuo Xu; Selina Olthof; Xiaodong Ren; Yucheng Liu; Dong Yang; Fei Gao; Shengzhong Liu

doi:10.1039/d0ta02222e

Efficient perovskite solar cellsviasurface passivation by a multifunctional small organic ionic compound

Xin Wu, Lu Zhang, Zhuo Xu, Selina Olthof, Xiaodong Ren, Yucheng Liu, Dong Yang, Fei Gao, Shengzhong Liu

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

75 Scopus citations

Abstract

Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-ethylpyridinium chloride (EPC) in combination with (FAPbI₃)_0.95(MAPbBr₃)_0.05. It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19%viathe EPC passivation and the devices show reduced hysteresis and increased stability.

Original language	English (US)
Pages (from-to)	8313-8322
Number of pages	10
Journal	Journal of Materials Chemistry A
Volume	8
Issue number	17
DOIs	https://doi.org/10.1039/d0ta02222e
State	Published - May 7 2020

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General Chemistry
Renewable Energy, Sustainability and the Environment
General Materials Science

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title = "Efficient perovskite solar cellsviasurface passivation by a multifunctional small organic ionic compound",

abstract = "Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-ethylpyridinium chloride (EPC) in combination with (FAPbI3)0.95(MAPbBr3)0.05. It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19%viathe EPC passivation and the devices show reduced hysteresis and increased stability.",

author = "Xin Wu and Lu Zhang and Zhuo Xu and Selina Olthof and Xiaodong Ren and Yucheng Liu and Dong Yang and Fei Gao and Shengzhong Liu",

note = "Funding Information: The author thanks Selina Olthof for proof reading the nal version of the manuscript. This work was funded by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17040506), the National Key Research and Development Program of China (2017YFA0204800/ 2016YFA0202403), the 111 Project (B14041), the Changjiang Scholars and Innovative Research Team (IRT_14R33), the Chinese National 1000 Talents Plan Program (1110010341), National University Research Fund (GK201903051). Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2020.",

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T1 - Efficient perovskite solar cellsviasurface passivation by a multifunctional small organic ionic compound

AU - Wu, Xin

AU - Zhang, Lu

AU - Xu, Zhuo

AU - Olthof, Selina

AU - Ren, Xiaodong

AU - Liu, Yucheng

AU - Yang, Dong

AU - Gao, Fei

AU - Liu, Shengzhong

N1 - Funding Information: The author thanks Selina Olthof for proof reading the nal version of the manuscript. This work was funded by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17040506), the National Key Research and Development Program of China (2017YFA0204800/ 2016YFA0202403), the 111 Project (B14041), the Changjiang Scholars and Innovative Research Team (IRT_14R33), the Chinese National 1000 Talents Plan Program (1110010341), National University Research Fund (GK201903051). Publisher Copyright: © The Royal Society of Chemistry 2020.

PY - 2020/5/7

Y1 - 2020/5/7

N2 - Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-ethylpyridinium chloride (EPC) in combination with (FAPbI3)0.95(MAPbBr3)0.05. It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19%viathe EPC passivation and the devices show reduced hysteresis and increased stability.

AB - Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-ethylpyridinium chloride (EPC) in combination with (FAPbI3)0.95(MAPbBr3)0.05. It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19%viathe EPC passivation and the devices show reduced hysteresis and increased stability.

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Efficient perovskite solar cellsviasurface passivation by a multifunctional small organic ionic compound

Abstract

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