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<p>Formamidinium-rich triiodide perovskites show great promise as light-absorption layers for next photovoltaic technology. However, the intricate process of phase transformation during the crystallization of this perovskite typically results in the presence of undesired hexagonal phases, leading to a degradation in solar cell efficiency and stability. Here we report the use of a hydrogen-bonded eutectic molecule (EM) as a [PbI<sub>6</sub>]<sup>4</sup><sup>−</sup> octahedra ligand to promote the dominant formation of corner-sharing octahedra. Our results demonstrate that the increased ratio of corner-sharing octahedra to face-sharing octahedra can prompt a complete phase transformation and facilitate the formation of pure cubic structure perovskite. Perovskite solar cells based on EM-fabricated films provide a power conversion efficiency of 25.8% (certified 25.7%) and excellent stability with a <i>T</i><sub>95</sub> lifetime of ~2,000 h.</p>

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Eutectic molecule ligand stabilizes photoactive black phase perovskite

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Zhi-Wen Gao,
  • Deng Wang,
  • Jun Fang,
  • Guanhaojie Zheng,
  • Jiayun Sun,
  • Yiran Tao,
  • Jie Zeng,
  • Longbin Qiu,
  • Xinhui Lu,
  • Haibin Su,
  • Yong Wang,
  • Baomin Xu,
  • Wallace C. H. Choy

摘要

Formamidinium-rich triiodide perovskites show great promise as light-absorption layers for next photovoltaic technology. However, the intricate process of phase transformation during the crystallization of this perovskite typically results in the presence of undesired hexagonal phases, leading to a degradation in solar cell efficiency and stability. Here we report the use of a hydrogen-bonded eutectic molecule (EM) as a [PbI6]4− octahedra ligand to promote the dominant formation of corner-sharing octahedra. Our results demonstrate that the increased ratio of corner-sharing octahedra to face-sharing octahedra can prompt a complete phase transformation and facilitate the formation of pure cubic structure perovskite. Perovskite solar cells based on EM-fabricated films provide a power conversion efficiency of 25.8% (certified 25.7%) and excellent stability with a T95 lifetime of ~2,000 h.