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Reductive ionic liquid-mediated crystallization for enhanced photovoltaic performance of Sn-based perovskite solar cells

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Abstract

Tin (Sn)-based perovskite solar cells (PSCs) have recently made inspiring progress, and certified power conversion efficiency (PCE) has reached impressive value of 14.8%. However, it is still challenging to realize efficient and stable 3D Sn-based PSCs due to the fast crystallization and easy Sn2+ oxidation of Sn-based perovskite. Herein, we reported the utilization of a reductive ionic liquid, methylamine formate (MAFa), to drive the controlled crystallization process and suppress Sn2+ oxidation of FASnI3 perovskite film. The coordination of C=O and Sn2+ and the hydrogen bonding of N-H⋯I between the MAFa and FASnI3 precursors are shown to be responsible for retarding the crystallization of FASnI3 during film-forming process, which promotes the oriented growth and reduced defect traps of the film. Moreover, the strong reducibility of −CHO groups in Fa− suppresses the oxidation of Sn2+ in the film. As a result, MAFa-modified 3D PSCs device could reach champion PCE of up to 8.50%, which is enhanced by 26.11% compared to the control device with PCE of 6.74%. Most importantly, the MAFa-modified device shows much improved stability compared to the control device under same conditions without encapsulation. This work adds key building blocks for further boosting the PCE and stability of Sn-based PSCs.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of China (Grants 51972172, 61705102, and 51802253), the China Postdoctoral Science Foundation (Grants 2021M692630), Natural Science Basic Research Plan in Shaanxi Province of China (2022JQ-629, 2021JLM-43), the Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (2020GXLH-Z-007 and 2020GXLH-Z-014), Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars, China (Grant BK20200034), the Innovation Project of Optics Valley Laboratory (OVL2021BG006), the Open Project Program of Wuhan National Laboratory for Optoelectronics (2021WNLOKF003), the Young 1000 Talents Global Recruitment Program of China, and the Fundamental Research Funds for the Central Universities.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Frontiers Science Center for Flexible Electronics, Xi’an Institute of Flexible Electronics (IFE) and Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    He Dong, Chenxin Ran, Wangyue Li, Xin Liu, Weiyin Gao & Wei Huang

  2. Key Laboratory of Flexible Electronics (KLOFE) & Institution of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, China

    Yingdong Xia, Yonghua Chen & Wei Huang

  3. Key Laboratory for Organic Electronics & Information Displays (KLOEID), and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Wei Huang

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  1. He Dong
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  2. Chenxin Ran
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  3. Wangyue Li
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  4. Xin Liu
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Correspondence to Chenxin Ran, Yingdong Xia or Wei Huang.

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Supporting information The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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11426_2022_1352_MOESM1_ESM.docx

Reductive Ionic Liquid-Mediated Crystallization for Enhanced Photovoltaic Performance of Sn-based Perovskite Solar Cells

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Dong, H., Ran, C., Li, W. et al. Reductive ionic liquid-mediated crystallization for enhanced photovoltaic performance of Sn-based perovskite solar cells. Sci. China Chem. 65, 1895–1902 (2022). https://doi.org/10.1007/s11426-022-1352-7

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  • DOI: https://doi.org/10.1007/s11426-022-1352-7

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