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<p>Roughness and fragility of bottom-up interfaces in perovskite solar cells accelerate device degradation and increase maintenance costs, while conventional interface engineering often fails to address issues at multiple interfaces simultaneously. Here, trimethyl(cyanomethyl)ammonium iodide is employed for a dual-interface self-regulation. Solution containing this molecule selectively desorbs non-covalently bonded self-assembled molecules, facilitating deprotonation of P−OH groups on self-assembled molecules. The resulting −PO<sup>−</sup> headgroups undergo secondary homogeneous assembly, converting weakly adsorbed self-assembled molecules into stable bonded P−O−metal species and reducing potential barriers in the bottom depletion region. Simultaneously, trimethyl(cyanomethyl)ammonium iodide is extracted to the perovskite surface, spontaneously forming a one-dimensional n-type capping layer with a robust edge-sharing skeleton and enhancing quasi-Fermi level splitting at the interface. This coupled interfacial reinforcement leads to a high efficiency of 27.05% (certified 26.61%) and maintains over 95% of the initial efficiency after 2,100 hours of continuous operation at 65 °C.</p>

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Chemically coupled dual-interface self-regulation for perovskite solar cells

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月13日

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  • Yutong Wu,
  • Bohong Chang,
  • Xichuang Tong,
  • Chufan Yu,
  • Zhen Liu,
  • Shiao Ma,
  • Chao Li,
  • Yan Chen,
  • Longwei Yin

摘要

Roughness and fragility of bottom-up interfaces in perovskite solar cells accelerate device degradation and increase maintenance costs, while conventional interface engineering often fails to address issues at multiple interfaces simultaneously. Here, trimethyl(cyanomethyl)ammonium iodide is employed for a dual-interface self-regulation. Solution containing this molecule selectively desorbs non-covalently bonded self-assembled molecules, facilitating deprotonation of P−OH groups on self-assembled molecules. The resulting −PO− headgroups undergo secondary homogeneous assembly, converting weakly adsorbed self-assembled molecules into stable bonded P−O−metal species and reducing potential barriers in the bottom depletion region. Simultaneously, trimethyl(cyanomethyl)ammonium iodide is extracted to the perovskite surface, spontaneously forming a one-dimensional n-type capping layer with a robust edge-sharing skeleton and enhancing quasi-Fermi level splitting at the interface. This coupled interfacial reinforcement leads to a high efficiency of 27.05% (certified 26.61%) and maintains over 95% of the initial efficiency after 2,100 hours of continuous operation at 65 °C.