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<p>All-perovskite tandem solar cells are constrained by asynchronous crystallization in multicomponent perovskites, which produces vertical compositional gradients, structural inhomogeneity and excessive non-radiative recombination. These effects arise from mismatched coordination and crystallization kinetics among mixed halides and Pb<sup>2+</sup>/Sn<sup>2+</sup> cations. Here we establish a generalizable additive design strategy guided by hard–soft acid–base principles to synchronize nucleation and crystal growth in both wide- and narrow-bandgap perovskites. Borderline-base difluoro(oxalato)borate and hard-base tetrafluoroborate selectively coordinate wide- and narrow-bandgap perovskite precursors, respectively, balancing the crystallization kinetics of PbI<sub>2</sub>/PbBr<sub>2</sub> and PbI<sub>2</sub>/SnI<sub>2</sub> and producing vertically uniform perovskite films with reduced defect densities and suppressed ion migration. In situ optical and structural characterization reveals homogeneous nucleation and direct crystal growth without intermediate halide redistribution. Monolithic two-terminal tandems achieve an efficiency of 30.3% (certified, 30.3%) with improved open-circuit voltage (2.16 V) and fill factor (85.2%), retaining 92% efficiency after 1,000 h of maximum power point tracking. Flexible tandems reach an efficiency of 28.2% (certified, 28.0%). These results establish chemical hardness matching as a universal principle for controlling crystallization in different perovskite systems.</p>

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Chemical hardness engineering synchronizes crystallization in perovskite tandems

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Ruijia Tian,
  • Kexuan Sun,
  • Yuanyuan Meng,
  • Jiahan Xie,
  • Yaohua Wang,
  • Xiaoyi Lu,
  • Jingnan Wang,
  • Shujing Zhou,
  • Ming Yang,
  • Haibin Pan,
  • Yang Bai,
  • Zhenhua Song,
  • Yingguo Yang,
  • Quan Liu,
  • Bin Han,
  • Bencan Tang,
  • Darren A. Walsh,
  • Hainam Do,
  • Chang Liu,
  • Ziyi Ge

摘要

All-perovskite tandem solar cells are constrained by asynchronous crystallization in multicomponent perovskites, which produces vertical compositional gradients, structural inhomogeneity and excessive non-radiative recombination. These effects arise from mismatched coordination and crystallization kinetics among mixed halides and Pb2+/Sn2+ cations. Here we establish a generalizable additive design strategy guided by hard–soft acid–base principles to synchronize nucleation and crystal growth in both wide- and narrow-bandgap perovskites. Borderline-base difluoro(oxalato)borate and hard-base tetrafluoroborate selectively coordinate wide- and narrow-bandgap perovskite precursors, respectively, balancing the crystallization kinetics of PbI2/PbBr2 and PbI2/SnI2 and producing vertically uniform perovskite films with reduced defect densities and suppressed ion migration. In situ optical and structural characterization reveals homogeneous nucleation and direct crystal growth without intermediate halide redistribution. Monolithic two-terminal tandems achieve an efficiency of 30.3% (certified, 30.3%) with improved open-circuit voltage (2.16 V) and fill factor (85.2%), retaining 92% efficiency after 1,000 h of maximum power point tracking. Flexible tandems reach an efficiency of 28.2% (certified, 28.0%). These results establish chemical hardness matching as a universal principle for controlling crystallization in different perovskite systems.