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<p>Perovskite/Cu(In,Ga)Se<sub>2</sub> (CIGS) tandem solar cells hold particular promise for flexible and lightweight applications, yet their efficiency still lags behind other perovskite-based tandem architectures. To achieve optimal spectral matching with the CIGS bottom cell, the perovskite top cell requires a wide bandgap, obtainable with a mixed-halide composition with high bromide content. However, perovskite films made with high bromide content suffer from inhomogeneous halide distribution, especially for scalable film fabrication method. Here we use 2-pyrrolidinone as the coordinating solvent to suppress the crystallization of the halide intermediates, maintaining a homogeneous halide distribution during ambient blade-coating of the perovskite film. We demonstrate a flexible monolithic two-terminal perovskite/CIGS tandem cell with a power conversion efficiency of 27.3%, with minimal efficiency loss over 500 h of operation.</p>

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Crystallization suppression of mixed-halide intermediates for perovskite/Cu(In,Ga)Se2 tandem solar cells with improved efficiency

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Shaochen Zhang,
  • Enbing Bi,
  • Borui Lei,
  • Liuwen Tian,
  • Xiaohe Miao,
  • Chongyan Lian,
  • Xiaonan Wang,
  • Xu Zhang,
  • Donger Jin,
  • Jingjing Zhou,
  • Yuan Tian,
  • Wei Fan,
  • Shenglong Chu,
  • Qingqing Liu,
  • Yang Gui,
  • Tie Guo,
  • Rui Wang,
  • Deren Yang,
  • Jingjing Xue

摘要

Perovskite/Cu(In,Ga)Se2 (CIGS) tandem solar cells hold particular promise for flexible and lightweight applications, yet their efficiency still lags behind other perovskite-based tandem architectures. To achieve optimal spectral matching with the CIGS bottom cell, the perovskite top cell requires a wide bandgap, obtainable with a mixed-halide composition with high bromide content. However, perovskite films made with high bromide content suffer from inhomogeneous halide distribution, especially for scalable film fabrication method. Here we use 2-pyrrolidinone as the coordinating solvent to suppress the crystallization of the halide intermediates, maintaining a homogeneous halide distribution during ambient blade-coating of the perovskite film. We demonstrate a flexible monolithic two-terminal perovskite/CIGS tandem cell with a power conversion efficiency of 27.3%, with minimal efficiency loss over 500 h of operation.