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Improved photostability of inverted-structure perovskite solar cells with high power conversion efficiency by inserting CuI between PEDOT and MAPbI3 layers

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Abstract

Inverted-structure perovskite devices with PEDOT and PEDOT/CuI as hole transport layers (HTLs) were prepared on Glass/ITO substrates. Surface morphology observation of the CuI revealed that the CuI grew on PEDOT in island mode. A concentration of 20 mg/ml was necessary for continuous CuI formation on the PEDOT. Optimization of the annealing time and the concentration of CuI precursor solution led to a PCE of 16.5% for a device with PEDOT/CuI as HTL, which was slightly higher than that (15%) with PEDOT as HTL. The slight enhancement of PCE was due to the faster hole transport efficiency and improved light-harvesting in the visible light region. Additionally, the photostability of the devices was greatly enhanced by the insertion of the CuI layer. Analysis indicated that the insertion of the CuI decreased the transmittance of light with wavelengths within 320–410 nm, which was the main reason for the enhanced photostability.

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Acknowledgement

This work is partially supported by the Pan African Materials Institute (PAMI), through funding from the World Bank (PAMI Grant ID ASU-NOA), to whom the authors are greatly indebted.

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Authors and Affiliations

  1. Department of Materials Physics and Chemistry, Xi’an University of Technology, Xi’an, 710048, China

    Yuanqing Chen, Lingwei Li, Yuhang He & Hanxiao Yang

  2. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Jingyuan Chu & Yuxia Shen

  3. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA

    Yuanqing Chen, Jingyuan Chu, Lingwei Li, Aditya S. Yerramilli & T. L. Alford

  4. Materials Science Program, African University of Science and Technology, Abuja, Nigeria

    T. L. Alford

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  1. Yuanqing Chen
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  8. T. L. Alford
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Chen, Y., Chu, J., Li, L. et al. Improved photostability of inverted-structure perovskite solar cells with high power conversion efficiency by inserting CuI between PEDOT and MAPbI3 layers. J Mater Sci: Mater Electron 32, 12929–12938 (2021). https://doi.org/10.1007/s10854-020-04666-z

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  • DOI: https://doi.org/10.1007/s10854-020-04666-z

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