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Eliminating Hysteresis of Perovskite Solar Cells with Hollow TiO2 Mesoporous Electron Transport Layer

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Abstract

Current density-voltage(J-V) hysteresis issue caused by unbalanced charge transport has greatly limited the improvement of power conversion efficiency(PCE) of halide perovskite solar cells(PSCs). Herein, hollow TiO2 mesoporous electron transport layer(ETL) was used to fabricate PSCs. The structure-dependent charge collection as well as its effect on PCE and hysteresis impactor(HI) of PSC were investigated. The results demonstrate that TiO2 hollow spheres in a size of around 50 nm (HS-50) can form a high quality perovskite/ETL interface with a less trap density. Moreover, the hollow TiO2 with the thin shell can help promote the extraction of electrons from perovskite layer to ETL, so as to reduce the charge accumulation and recombination at the perovskite/ETL interface and alleviate the hysteresis behavior. As a result, PSCs with HS-50 TiO2 delivered a champion PCE of 16.81% with a small HI of 0.0297, indicating a better performance than the commercial P25(PCE of 15.87%, HI of 0.2571).

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Acknowledgements

This work was supported by the Key Projects in the National Science & Technology Pillar Program in the Eleventh Five-Year Plan Period, China(No. 2008BAC43B01) and the Fundamental Research Funds for the Central Universities, China(No.2017XS058).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China

    Wensheng Han, Yongling Wang, Jiawei Wan & Dan Wang

  2. University of Chinese Academy of Sciences, Beijing, 100049, P. R. China

    Yongling Wang, Jiawei Wan & Dan Wang

  3. Graduate School of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, 376-8515, Japan

    Wensheng Han

Authors
  1. Wensheng Han
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  2. Yongling Wang
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  3. Jiawei Wan
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  4. Dan Wang
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Correspondence to Jiawei Wan or Dan Wang.

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Han, W., Wang, Y., Wan, J. et al. Eliminating Hysteresis of Perovskite Solar Cells with Hollow TiO2 Mesoporous Electron Transport Layer. Chem. Res. Chin. Univ. 38, 117–122 (2022). https://doi.org/10.1007/s40242-022-1401-x

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  • DOI: https://doi.org/10.1007/s40242-022-1401-x

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