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Targeted elimination of tetravalent-Sn-induced defects for enhanced efficiency and stability in lead-free NIR-II perovskite LEDs

Author

Listed:
  • Xiang Guan

    (Fudan University
    Huaqiao University)

  • Yuqing Li

    (Huaqiao University)

  • Yuanyuan Meng

    (Huaqiao University)

  • Kongxiang Wang

    (Fudan University)

  • Kebin Lin

    (Huaqiao University)

  • Yujie Luo

    (Fudan University)

  • Jing Wang

    (Fudan University)

  • Zhongtao Duan

    (Fudan University)

  • Hong Liu

    (Fudan University)

  • Liu Yang

    (Huaqiao University)

  • Lingfang Zheng

    (Huaqiao University)

  • Junpeng Lin

    (Huaqiao University)

  • Yalian Weng

    (Huaqiao University)

  • Fengxian Xie

    (Fudan University)

  • Jianxun Lu

    (Huaqiao University
    Division of Physical Science and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology)

  • Zhanhua Wei

    (Huaqiao University)

Abstract

Eco-friendly Sn-based perovskites show significant potential for high-performance second near-infrared window light-emitting diodes (900 nm – 1700 nm). Nevertheless, achieving efficient and stable Sn-based perovskite second near-infrared window light-emitting diodes remains challenging due to the propensity of Sn2+ to oxidize, resulting in detrimental Sn4+-induced defects and compromised device performance. Here, we present a targeted strategy to eliminate Sn4+-induced defects through moisture-triggered hydrolysis of tin tetrahalide, without degrading Sn2+ in the CsSnI3 film. During the moisture treatment, tin tetrahalide is selectively hydrolyzed to Sn(OH)4, which provides sustained protection. As a result, we successfully fabricate second near-infrared window light-emitting diodes emitting at 945 nm, achieving a performance breakthrough with an external quantum efficiency of 7.6% and an operational lifetime reaching 82.6 h.

Suggested Citation

  • Xiang Guan & Yuqing Li & Yuanyuan Meng & Kongxiang Wang & Kebin Lin & Yujie Luo & Jing Wang & Zhongtao Duan & Hong Liu & Liu Yang & Lingfang Zheng & Junpeng Lin & Yalian Weng & Fengxian Xie & Jianxun , 2024. "Targeted elimination of tetravalent-Sn-induced defects for enhanced efficiency and stability in lead-free NIR-II perovskite LEDs," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-54160-x
    DOI: 10.1038/s41467-024-54160-x
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    References listed on IDEAS

    as
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