Enhancing performance of low-temperature processed CsPbI<sub>2</sub>Br all-inorganic perovskite solar cells using polyethylene oxide-modified TiO<sub>2</sub>

Xu Zhao; Naitao Gao; Shengcheng Wu; Shaozhen Li; Sujuan Wu

doi:10.1007/s12613-023-2742-2

Volume 31 Issue 4

Apr. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(4): 786-794

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

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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

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Research Article

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

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

Sujuan Wu E-mail: origen2003@whpu.edu.cn
Received: 20 June 2023; Revised: 8 September 2023; Accepted: 11 September 2023; Available online: 13 September 2023

Abstract

Abstract

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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