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Volume 31 Issue 4
Apr.  2024

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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
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
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研究论文

PEO修饰TiO2电子层提高低温制备的全无机钙钛矿太阳能电池光电性能



    * 共同第一作者
  • 通讯作者:

    李少珍    E-mail: sujwu@scnu.edu.cn

    吴素娟    E-mail: origen2003@whpu.edu.cn

文章亮点

  • (1) 系统地研究了PEO修饰对CsPbI2Br-基全无机钙钛矿太阳能电池光电性能影响规律。
  • (2) 开发了调控低温TiO2/CsPbI2Br界面的简单方法。
  • (3) 深入探究了PEO修饰该界面提高电池光电性能的可能原因。
  • 由于成本低廉、热稳定性好,低温工艺制备的CsPbX3-基 (X = I, Br, Cl) 无机钙钛矿太阳能电池 (PSCs) 备受关注。但是,在低温工艺制备的TiO2膜与无机钙钛矿层间的界面存在较高的缺陷态密度,导致严重的电荷复合,从而限制了全无机钙钛矿太阳能电池效率的提高。因此,本工作引入聚环氧乙烷(PEO)修饰的TiO2 膜来钝化该界面的缺陷态,促进载流子的传导与收集。系统研究了PEO修饰对TiO2膜、CsPbI2Br层微结构及电池光电性能的影响。研究结果显示:PEO修饰将降低TiO2膜的表面粗糙度及其平均表面电势、并且钝化该界面的缺陷态。在最优工艺条件下,PEO修饰后将电池的最优光电转换效率由9.03%提高到了11.24%。同时,PEO的修饰抑制了电池中的电滞回效应,减小了电荷复合,促进了载流子的有效传导与收集。
  • Research Article

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

    + Author Affiliations
    • 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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    • Supplementary Information-s12613-023-2742-2.docx
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