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<p>The interfacial molecular dipole enhances the photovoltaic performance of perovskite solar cells (PSCs) by facilitating improved charge extraction. However, conventional self-assembled monolayers (SAMs) face challenges like inadequate interface coverage and weak dipole interactions. Herein, we develop a strategy using a self-assembled ferroelectric layer to modify the interfacial properties of PSCs. Specifically, we employ 1-adamantanamine hydroiodide (ADAI) to establish robust chemical interactions and create a dipole layer over the perovskite. The oriented molecular packing and spontaneous polarity of ferroelectric ADAI generate a substantial interfacial dipole, adjusting band bending at the anode, reducing band misalignment, and suppressing charge recombination. Consequently, our formamidinium lead iodide-based conventional PSC achieves efficiencies of 25.13% (0.06 cm<sup>2</sup>) and 23.5% (1.00 cm<sup>2</sup>) while exhibiting enhanced stability. Notably, we demonstrate an impressive efficiency of 25.59% (certified at 25.36%) in a 0.06 cm<sup>2</sup> area for the inverted champion device, showcasing the promise of ferroelectric SAMs for PSCs performance enhancement.</p>

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Molecular ferroelectric self-assembled interlayer for efficient perovskite solar cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月19日

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  • Chang Xu,
  • Pengjie Hang,
  • Chenxia Kan,
  • Xiangwei Guo,
  • Xianjiang Song,
  • Chenran Xu,
  • Guofeng You,
  • Wei-Qiang Liao,
  • Haiming Zhu,
  • Dawei Wang,
  • Qi Chen,
  • Zijian Hong,
  • Ren-Gen Xiong,
  • Xuegong Yu,
  • Lijian Zuo,
  • Hongzheng Chen

摘要

The interfacial molecular dipole enhances the photovoltaic performance of perovskite solar cells (PSCs) by facilitating improved charge extraction. However, conventional self-assembled monolayers (SAMs) face challenges like inadequate interface coverage and weak dipole interactions. Herein, we develop a strategy using a self-assembled ferroelectric layer to modify the interfacial properties of PSCs. Specifically, we employ 1-adamantanamine hydroiodide (ADAI) to establish robust chemical interactions and create a dipole layer over the perovskite. The oriented molecular packing and spontaneous polarity of ferroelectric ADAI generate a substantial interfacial dipole, adjusting band bending at the anode, reducing band misalignment, and suppressing charge recombination. Consequently, our formamidinium lead iodide-based conventional PSC achieves efficiencies of 25.13% (0.06 cm2) and 23.5% (1.00 cm2) while exhibiting enhanced stability. Notably, we demonstrate an impressive efficiency of 25.59% (certified at 25.36%) in a 0.06 cm2 area for the inverted champion device, showcasing the promise of ferroelectric SAMs for PSCs performance enhancement.