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<p>Simulation-driven investigations are presented on highly efficient monolithic tandem solar cells with climate-efficient nano-scaled perovskite and crystalline silicon for green energy generation. Tandem solar cells comprise a lead-free CsGeI<sub>3</sub> perovskite top cell and a silicon bottom sub-cell. A Cu<sub>2</sub>O hole transport material layer and a ZnO electron transport material layer was used. Optimizations were performed by varying doping, defect concentration, thickness, and band gap to obtain valuable insights into material properties. These perovskite-silicon tandem solar cells, with a wide band gap and optimized parameters, yielded power conversion efficiencies above the Shockley-Queisser limit for single-junction cells. The structure of perovskite-silicon tandem solar cells is Glass/FTO/ZnO/CsGeI<sub>3</sub>/Cu<sub>2</sub>O/RL/Si(p<sup>+</sup>)/Si(p)/Si(n)/Au. After optimization, the results show a power conversion efficiency of 37.23%, a J<sub>sc</sub> of 23.95&#xa0;mA/cm<sup>2</sup>, a Voc of 1.895&#xa0;V, and an FF of 82%. This research shows that through this hybrid perovskite-silicon technology, one is assured of increased energy output while decreasing carbon footprints and increasing renewable energy use.</p>

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Bandgap engineering and high-throughput defect dynamics in two-terminal CsGeI3-Si monolithic tandem solar cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月18日

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  • Sujata Singh,
  • Gun Anit Kaur,
  • Mamta Shandilya,
  • Ajit Sharma,
  • Pravin Kumar Singh

摘要

Simulation-driven investigations are presented on highly efficient monolithic tandem solar cells with climate-efficient nano-scaled perovskite and crystalline silicon for green energy generation. Tandem solar cells comprise a lead-free CsGeI3 perovskite top cell and a silicon bottom sub-cell. A Cu2O hole transport material layer and a ZnO electron transport material layer was used. Optimizations were performed by varying doping, defect concentration, thickness, and band gap to obtain valuable insights into material properties. These perovskite-silicon tandem solar cells, with a wide band gap and optimized parameters, yielded power conversion efficiencies above the Shockley-Queisser limit for single-junction cells. The structure of perovskite-silicon tandem solar cells is Glass/FTO/ZnO/CsGeI3/Cu2O/RL/Si(p+)/Si(p)/Si(n)/Au. After optimization, the results show a power conversion efficiency of 37.23%, a Jsc of 23.95 mA/cm2, a Voc of 1.895 V, and an FF of 82%. This research shows that through this hybrid perovskite-silicon technology, one is assured of increased energy output while decreasing carbon footprints and increasing renewable energy use.