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<p>Tin perovskite has emerged as a leading lead-free perovskite solar cell material, yet its performance is hindered by high defect density due to facile oxidation. In this work, we develop a high-entropy tin perovskite by incorporating five distinct organic A-site cations. The increased entropy benefits the decrease of reaction enthalpy change (Δ<i>H</i>), effectively suppressing oxidation. Solar cells based on this wide-bandgap high-entropy tin perovskite achieve a power conversion efficiency (PCE) of 8.45%, which is 15% higher than a conventional low-entropy structure. Furthermore, the enhanced stability of the perovskite film enables atomic layer deposition of SnO<sub><i>x</i></sub> on the top as an electron transport layer under humid conditions. It allows the fabrication of efficient semi-transparent wide-bandgap tin perovskite solar cells showing a PCE of 8.2%. Leveraging this efficient half-transparent device, we demonstrate the first successful fabrication of a tin perovskite/silicon tandem solar cell showing a PCE of 16.2%.</p>

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High-entropy wide bandgap tin perovskites for single junction and perovskite-silicon tandem solar cells

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Haitao Lang,
  • Zihao Zang,
  • Mingyu Ma,
  • Qi Wei,
  • Hao Liang,
  • Wei Zhou,
  • Gaoqi Liu,
  • Wenjia Zhou,
  • Zhijun Ning

摘要

Tin perovskite has emerged as a leading lead-free perovskite solar cell material, yet its performance is hindered by high defect density due to facile oxidation. In this work, we develop a high-entropy tin perovskite by incorporating five distinct organic A-site cations. The increased entropy benefits the decrease of reaction enthalpy change (ΔH), effectively suppressing oxidation. Solar cells based on this wide-bandgap high-entropy tin perovskite achieve a power conversion efficiency (PCE) of 8.45%, which is 15% higher than a conventional low-entropy structure. Furthermore, the enhanced stability of the perovskite film enables atomic layer deposition of SnOx on the top as an electron transport layer under humid conditions. It allows the fabrication of efficient semi-transparent wide-bandgap tin perovskite solar cells showing a PCE of 8.2%. Leveraging this efficient half-transparent device, we demonstrate the first successful fabrication of a tin perovskite/silicon tandem solar cell showing a PCE of 16.2%.