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<p>Among emerging thin-film solar cells, kesterite Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> (CZTSSe) absorbers offer several advantages: they are based on earth-abundant, non-toxic elements and combine high stability, tunable bandgap (E<sub>g</sub>), and flexibility, key features for integrated photovoltaic (PV) applications. Selenium-rich CZTSSe (E<sub>g</sub> of 1.1 eV) is an ideal bottom-cell candidate for flexible tandem devices with perovskites, thereby maximising efficiency. However, CZTSSe/perovskite tandems are still underexplored. Here, we report an effective solution<i>-</i>based route for producing high-efficiency CZTSSe bottom cells on both rigid Mo-coated soda-lime-glass and flexible Mo-foil substrates. To optimise absorber morphology and grain size, Na-doping and Ag-alloying were performed. Then, 4-Terminal (4T) tandem devices combining kesterite- and perovskite-based subcells were designed. Solution-processed Cs<sub>0.17</sub>FA<sub>0.83</sub>Pb(I<sub>0.90</sub>Br<sub>0.10</sub>)<sub>3</sub> perovskites (E<sub>g</sub> of 1.63 eV) ensured optimal bandgap matching and broadened light harvesting, yielding efficiencies exceeding 22% and 20% for rigid and flexible 4T tandem devices, respectively. This proof-of-concept solution-processed tandem approach represents a promising step toward developing cost-effective and sustainable PV technologies, with promising results for future solar energy applications.</p><p></p>

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Demonstration of overcoming 20% efficiency in kesterite/perovskite tandem solar cells on rigid and flexible substrates

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月30日

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  • Carla Gobbo,
  • Vanira Trifiletti,
  • Giorgio Tseberlidis,
  • Yuancai Gong,
  • Alex Jimenez-Arguijo,
  • Chiara Boldrini,
  • Jessica Barichello,
  • Luigi Angelo Castriotta,
  • Yassine Raoui,
  • Paolo Mariani,
  • Fabio Matteocci,
  • Aldo Di Carlo,
  • Paolo Biagini,
  • Edgardo Saucedo,
  • Riccardo Po,
  • Simona Binetti

摘要

Among emerging thin-film solar cells, kesterite Cu2ZnSn(S,Se)4 (CZTSSe) absorbers offer several advantages: they are based on earth-abundant, non-toxic elements and combine high stability, tunable bandgap (Eg), and flexibility, key features for integrated photovoltaic (PV) applications. Selenium-rich CZTSSe (Eg of 1.1 eV) is an ideal bottom-cell candidate for flexible tandem devices with perovskites, thereby maximising efficiency. However, CZTSSe/perovskite tandems are still underexplored. Here, we report an effective solution-based route for producing high-efficiency CZTSSe bottom cells on both rigid Mo-coated soda-lime-glass and flexible Mo-foil substrates. To optimise absorber morphology and grain size, Na-doping and Ag-alloying were performed. Then, 4-Terminal (4T) tandem devices combining kesterite- and perovskite-based subcells were designed. Solution-processed Cs0.17FA0.83Pb(I0.90Br0.10)3 perovskites (Eg of 1.63 eV) ensured optimal bandgap matching and broadened light harvesting, yielding efficiencies exceeding 22% and 20% for rigid and flexible 4T tandem devices, respectively. This proof-of-concept solution-processed tandem approach represents a promising step toward developing cost-effective and sustainable PV technologies, with promising results for future solar energy applications.