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Air-processed and mixed-cation single crystal engineering-based perovskite films for efficient and air-stable perovskite solar cells

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Abstract

Metal hybrid halide perovskite solar cells (PSCs) are very sensitive to air, and it is challenging to obtain air-processed, air-stable, and highly crystalline perovskite films. Photovoltaic performance decays dramatically due to air humidity influence with power conversion efficiency (PCE) of most air-processed PSCs < 15%. In this work, we develop a facile method to air-processed, highly crystalline (MA0.2FA0.8PbI3)1.0(CsPbBr3)0.05 perovskite films in ambient air with large grain size and low trap density based on mix-cation single crystal engineering. This method shows 75% increase in grain size and 28% decrease in trap density than conventional molecule/ion solution mixing-processed method. The large grain, low trap density, andhigh crystalline perovskite films result in high-efficient and air-stable PSCs. Consequently, the PCE increases to 36.7% from 12.56% for conventional molecule/ion solution mixing-processed devices and to 17.17% for single crystal engineering-based ones. Furthermore, benefiting from high moisture resistance of mix-cation single crystal engineering-based films, the PSC air stability has been improved significantly and 72% of the initial performance retains after 40 days of storage in ambient environment with a relative humidity of 60% at 25 °C without any encapsulation, with a 26% slower degradation rate than conventional solution-mixing method.

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Acknowledgements

This work is supported by the National Key Research and Development Program of China (Grant No. 2016YFB0700702), the Natural Science Foundation of China (Grant No. 51502101), and the National Basic Research Program of China (Grant No. 2015CB258400). We also thank the testing center of Huazhong University of Science and Technology for SEM, XRD, PL, UV, and FT-IR measurements.

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Authors and Affiliations

  1. Shannxi Key Laboratory of Chemical Additives for Industry, Shanxi University of Science and Technology, Xi’an, 710021, China

    Yanna Zhao & Chunyan Zhao

  2. Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xiayan Chen, Tianyuan Luo, Manman Ding, Tian Ye, Wenfeng Zhang & Haixin Chang

  3. Quantum-Nano Matter and Device Lab, Huazhong University of Science and Technology, Wuhan, 430074, China

    Chunyan Zhao, Xiayan Chen, Tianyuan Luo, Manman Ding, Tian Ye, Wenfeng Zhang & Haixin Chang

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  1. Yanna Zhao
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Zhao, Y., Zhao, C., Chen, X. et al. Air-processed and mixed-cation single crystal engineering-based perovskite films for efficient and air-stable perovskite solar cells. J Mater Sci: Mater Electron 31, 2167–2176 (2020). https://doi.org/10.1007/s10854-019-02742-7

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