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<p>Faced with the accelerating energy transition, thin-film solar cells based on abundant materials are attracting increasing interest. This study examines a device architecture for CZTS solar cells combining a CuO/Cu₂O bilayer absorber and a ZrS₂ buffer layer. Simulations were used to evaluate the influence of absorber thickness, surface acceptor density, defect concentration, and operating temperature on device performance. The results demonstrate that an optimal CuO layer thickness of 0.2&#xa0;μm achieves a maximum power conversion efficiency of approximately 20%, a significant improvement compared to single-layer Cu₂O devices. This thin-film technology exhibits better charge carrier separation and reduced interfacial recombination. Thermal characterization also shows that, although both configurations experience performance losses at high temperatures, the Cu₂O-integrated device maintains significantly greater stability. These results establish interface engineering and defect passivation as essential pathways for high-performance and environmentally friendly kesterite-based photovoltaic cells.</p>

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Enhancing CZTS solar cell performance: optimizing CuO/Cu2O Bilayer absorbers with ZrS2 buffer layers

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • O. Belhaidouri,
  • A. Kharissi,
  • R. Moultif,
  • L. Mouakkir,
  • A. Hader,
  • M. Tanasehte,
  • Y. Lachtioui,
  • Y. Ezaier,
  • S. Rochd

摘要

Faced with the accelerating energy transition, thin-film solar cells based on abundant materials are attracting increasing interest. This study examines a device architecture for CZTS solar cells combining a CuO/Cu₂O bilayer absorber and a ZrS₂ buffer layer. Simulations were used to evaluate the influence of absorber thickness, surface acceptor density, defect concentration, and operating temperature on device performance. The results demonstrate that an optimal CuO layer thickness of 0.2 μm achieves a maximum power conversion efficiency of approximately 20%, a significant improvement compared to single-layer Cu₂O devices. This thin-film technology exhibits better charge carrier separation and reduced interfacial recombination. Thermal characterization also shows that, although both configurations experience performance losses at high temperatures, the Cu₂O-integrated device maintains significantly greater stability. These results establish interface engineering and defect passivation as essential pathways for high-performance and environmentally friendly kesterite-based photovoltaic cells.