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<p>The performance of all-perovskite tandem solar cells is critically hindered by the defective and high-roughness surfaces of lead-tin narrow-bandgap subcells, which induce non-radiative recombination and impede carrier extraction. Herein, we report a robust and multifunctional strategy to convert the above narrow-bandgap perovskite surface into an efficient and smooth one by a picosecond ultraviolet pulsed laser polishing technology combined with surface reconstruction. The polished surface is decoded as [PbI₆]⁴⁻/[SnI₆]⁴⁻ octahedral frameworks with metastable A-site vacancies. By screening guanidinium bromide as an A-site passivator, the polished surface is reconstructed into a guanidinium-cesium-based perovskite phase, substantially enhancing carrier extraction and suppressing ion migration. The resulting single-junction lead-tin and tandem solar cells, fabricated via an antisolvent-free method, achieve efficiencies of 23.47% (certified) and 29.80%, respectively, alongside exceptional operational stability. This versatile interface engineering paradigm surmounts a pivotal barrier in the advancement of next-generation photovoltaic technologies.</p>

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Non-contact laser polishing and reconstruction towards high-efficiency all-perovskite tandem solar cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月8日

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  • Tianjun Ma,
  • Dingfu Luo,
  • Wenjiang Ye,
  • Xinzhao Zhao,
  • Jun Yan,
  • Hao Wang,
  • Ruiheng Gao,
  • XuKe Yang,
  • Mingyu Li,
  • Yuheng Li,
  • Sifan Liu,
  • Salman Ali,
  • Qilin Guo,
  • Bingxin Ding,
  • Shiwu Chen,
  • Michael Wang,
  • Chris Cheng,
  • Ying Zhou,
  • Chao Chen,
  • Pingli Qin,
  • Haisheng Song,
  • Jiang Tang

摘要

The performance of all-perovskite tandem solar cells is critically hindered by the defective and high-roughness surfaces of lead-tin narrow-bandgap subcells, which induce non-radiative recombination and impede carrier extraction. Herein, we report a robust and multifunctional strategy to convert the above narrow-bandgap perovskite surface into an efficient and smooth one by a picosecond ultraviolet pulsed laser polishing technology combined with surface reconstruction. The polished surface is decoded as [PbI₆]⁴⁻/[SnI₆]⁴⁻ octahedral frameworks with metastable A-site vacancies. By screening guanidinium bromide as an A-site passivator, the polished surface is reconstructed into a guanidinium-cesium-based perovskite phase, substantially enhancing carrier extraction and suppressing ion migration. The resulting single-junction lead-tin and tandem solar cells, fabricated via an antisolvent-free method, achieve efficiencies of 23.47% (certified) and 29.80%, respectively, alongside exceptional operational stability. This versatile interface engineering paradigm surmounts a pivotal barrier in the advancement of next-generation photovoltaic technologies.