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<p>The efficiency–stability trade-off in perovskite solar cells continues to be challenged by issues such as ion migration and defects at grain boundaries and interfaces. Here we address this challenge by an in situ kinetic processing route using a bifunctional spacer, 2-(prop-2-en-1-ylsulfanyl)ethan-1-amine hydrochloride (PYA). Arresting annealing at a metastable stage enables PYA infiltration along widened grain boundaries and incompletely crystallized buried interfaces, whereas deep-ultraviolet activation crosslinks PYA to form a phase-pure 2D ‘nanomesh’ that encapsulates three-dimensional grains. This omnidirectional network enables defect passivation across the surface, bulk and interface; suppresses electrostrictive lattice distortion by over 80%; and reduces iodide migration ratio by more than 55%, linking mechanical reinforcement to operational resilience. Devices deliver a power conversion efficiency of 27.37% (certified, 27.01%) and retain over 90% performance after 2,110 h of 1-sun illumination, over 95% after 2,400 h at 85 °C in a N<sub>2</sub> atmosphere, and 97% after 500 thermal cycles between −40 °C and 85 °C. These results demonstrate a viable pathway towards inherently stable, high-efficiency perovskite photovoltaics.</p>

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Omnidirectional ionic locking network for stable perovskite photovoltaics

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Daming Zheng,
  • Tianyin Miao,
  • Zuhong Zhang,
  • Karol Vegso,
  • Tao Zhu,
  • Luyao Wang,
  • Zhiyuan Xu,
  • Sami Ullah,
  • Lenka Pribusova Slusna,
  • Gunhee Kim,
  • Dingqin Hu,
  • Patrick Fong,
  • Zonghao Liu,
  • Jie Lv,
  • Peter Siffalovic,
  • Nada Mrkyvkova,
  • Wei Chen,
  • Antonio Abate,
  • Meng Li,
  • Gang Li

摘要

The efficiency–stability trade-off in perovskite solar cells continues to be challenged by issues such as ion migration and defects at grain boundaries and interfaces. Here we address this challenge by an in situ kinetic processing route using a bifunctional spacer, 2-(prop-2-en-1-ylsulfanyl)ethan-1-amine hydrochloride (PYA). Arresting annealing at a metastable stage enables PYA infiltration along widened grain boundaries and incompletely crystallized buried interfaces, whereas deep-ultraviolet activation crosslinks PYA to form a phase-pure 2D ‘nanomesh’ that encapsulates three-dimensional grains. This omnidirectional network enables defect passivation across the surface, bulk and interface; suppresses electrostrictive lattice distortion by over 80%; and reduces iodide migration ratio by more than 55%, linking mechanical reinforcement to operational resilience. Devices deliver a power conversion efficiency of 27.37% (certified, 27.01%) and retain over 90% performance after 2,110 h of 1-sun illumination, over 95% after 2,400 h at 85 °C in a N2 atmosphere, and 97% after 500 thermal cycles between −40 °C and 85 °C. These results demonstrate a viable pathway towards inherently stable, high-efficiency perovskite photovoltaics.