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Decreased uncoordinated Pb2+ defects induced by Lewis base for high-quality PSCs with much improved carrier transportation

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Abstract

Perovskite solar cells (PSCs) have received extensive attention due to their excellent photovoltaic properties. However, existence of defects, such as Pb2+ and I− vacancies, restricts its further improvement of power conversion efficiency (PCE) and affects the stability of PSCs devices. In this study, glycine methyl ester hydrochloride (GMEH) was introduced as interface modification material. As Lewis base, GMEH formed a chemical bonding of Pb–O with perovskite to decrease uncoordinated Pb2+ defects, thus transfer of charge carriers was obviously facilitated, indicating that status of Pb2+ in perovskite structure is one of key factors for carrier transportation. Meanwhile, amino group in GMEH combined with iodide to form hydrogen bond, thereby stabilized perovskite structure and decreased ion migration. Eventually, a champion efficiency of 21.94% was obtained with promoted short-circuit current (JSC) and fill factor (FF). Meanwhile, the stability of PSCs was significantly improved. The modified PSCs can maintain 90% of the initial efficiency after storing in a nitrogen filled glove box for 1700 h, while the control one can only maintain 55%. And the stability of the modified device in humid air was also greatly improved.

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Acknowledgements

The authors gratefully acknowledge the financial support from Application Foundation Project of Science and Technology of Sichuan Province (Grant No. 2021YJ0069), Youth Science and Technology Innovation Team Project of SWPU (Grant No. 2019CXTD04), and the Scientific Research Starting Project of SWPU (Grant No. 2019QHZ013), and the Young Scholars Development Fund of SWPU (Grant No. 201999010017).

Funding

Funding was provided by Application Foundation Project of Science and Technology of Sichuan Province (Grant No. 2021YJ0069), Youth Science and Technology Innovation Team Project of SWPU (Grant Nos. 2019CXTD04, 2019QHZ013) and Young Scholars Development Fund of SWPU (Grant No. 201999010017).

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Authors and Affiliations

  1. School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, People’s Republic of China

    Yafei Ni, Haimin Li, Xingchong Liu, Hanyu Wang, Yue Lei, Shuqian Liu & Yanling Tang

  2. Sichuan Product Quality Supervision and Testing Institute, Chengdu, 610100, People’s Republic of China

    Ming Li

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Contributions

YN: experimental design, device fabrication and characterization, data analysis, and finalizing manuscript. HL: conceptualization, supervision, reviewing manuscript and resources. ML: resources. XL: methodology, data analysis. HW: supervision, data analysis. YL: data analysis. SL: data analysis. YT: data analysis.

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Ni, Y., Li, H., Li, M. et al. Decreased uncoordinated Pb2+ defects induced by Lewis base for high-quality PSCs with much improved carrier transportation. J Mater Sci: Mater Electron 34, 553 (2023). https://doi.org/10.1007/s10854-023-10004-w

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