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Research Article

Moisture-preventing MAPbI3 solar cells with high photovoltaic performance via multiple ligand engineering

Xin Li1, Jinyue Du1, Hui Duan1, Haoyan Wang1, Lin Fan1,2,3, Yunfei Sun1,2,3, Yingrui Sui1,2,3, Jinghai Yang1,2,3( ), Fengyou Wang1,2,3( ), Lili Yang1,2,3( )
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal University Changchun 130103 China
National Demonstration Center for Experimental Physics Education Jilin Normal University Siping 136000 China
Key Laboratory of Preparation and Application of Environmental Friendly Materials Ministry of Education Jilin Normal University Changchun 130103 China
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Graphical Abstract

Abstract

Perovskite solar cells present one of the most prominent photovoltaic technologies, yet their stability, and engineering at the molecular level remain challenging. We have demonstrated multifunctional molecules to improve the operating stability of perovskite solar cells while depicting a high-power conversion efficiency. The multifunctional molecule 4-[(trifluoromethyl) sulphanyl]-aniline (4TA) with trifluoromethyl (-CF3) and aniline (-NH2) moieties is meticulously designed to modulate the perovskite. The -CF3 and -NH2 functional groups have strong interaction with perovskite to suppress surface defects to improve device stability, as well as obtain large crystal grains through delaying crystallization. Moreover, this -CF3 forms a hydrophobic barrier on the surface of the perovskite to prevent cell decomposition. Consequently, the performance of the perovskite solar cells is remarkably improved with the efficiency increased from 18.00% to 20.24%. The perovskite solar cells with multifunctional molecular maintaining 93% of their original efficiency for over 30 days (~ 55% humidity) in air without device encapsulation, exhibiting a high long-term stability. Moreover, the lead leakage issue of perovskite solar cells has also been suppressed by the built-in 4TA molecule, which is beneficial to environment-friendly application. Ultimately, we believe this multifunctional small molecule provides an available way to achieve high performance perovskite solar cells and the related design strategy is helpful to further develop more versatile materials for perovskite-based optoelectronic devices.

Keywords

stabilityperovskite solar cellshigh-power conversion efficiencyhydrophobic barrier

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Nano Research
Volume 15 Issue 2,
February 2022
Pages 1375-1382
DOI: 10.1007/s12274-021-3673-8
Cite this article:
Li X, Du J, Duan H, et al. Moisture-preventing MAPbI3 solar cells with high photovoltaic performance via multiple ligand engineering. Nano Research, 2022, 15(2): 1375-1382. https://doi.org/10.1007/s12274-021-3673-8
Topics:
Perovskite solar cells

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Received: 28 April 2021
Revised: 03 June 2021
Accepted: 10 June 2021
Published: 03 August 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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