Xu Zhao, Naitao Gao, Shengcheng Wu, Shaozhen Li, and Sujuan Wu, Enhancing performance of low-temperature processed CsPbI2Br all-inorganic perovskite solar cells using polyethylene oxide-modified TiO2, Int. J. Miner. Metall. Mater., 31(2024), No. 4, pp. 786-794. https://doi.org/10.1007/s12613-023-2742-2
Cite this article as:
Xu Zhao, Naitao Gao, Shengcheng Wu, Shaozhen Li, and Sujuan Wu, Enhancing performance of low-temperature processed CsPbI2Br all-inorganic perovskite solar cells using polyethylene oxide-modified TiO2, Int. J. Miner. Metall. Mater., 31(2024), No. 4, pp. 786-794. https://doi.org/10.1007/s12613-023-2742-2
Research Article

Enhancing performance of low-temperature processed CsPbI2Br all-inorganic perovskite solar cells using polyethylene oxide-modified TiO2

+ Author Affiliations
  • Corresponding authors:

    Shaozhen Li    E-mail: sujwu@scnu.edu.cn

    Sujuan Wu    E-mail: origen2003@whpu.edu.cn

  • Received: 20 June 2023Revised: 8 September 2023Accepted: 11 September 2023Available online: 13 September 2023
  • CsPbX3-based (X = I, Br, Cl) inorganic perovskite solar cells (PSCs) prepared by low-temperature process have attracted much attention because of their low cost and excellent thermal stability. However, the high trap state density and serious charge recombination between low-temperature processed TiO2 film and inorganic perovskite layer interface seriously restrict the performance of all-inorganic PSCs. Here a thin polyethylene oxide (PEO) layer is employed to modify TiO2 film to passivate traps and promote carrier collection. The impacts of PEO layer on microstructure and photoelectric characteristics of TiO2 film and related devices are systematically studied. Characterization results suggest that PEO modification can reduce the surface roughness of TiO2 film, decrease its average surface potential, and passivate trap states. At optimal conditions, the champion efficiency of CsPbI2Br PSCs with PEO-modified TiO2 (PEO-PSCs) has been improved to 11.24% from 9.03% of reference PSCs. Moreover, the hysteresis behavior and charge recombination have been suppressed in PEO-PSCs.
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