Current Photovoltaic Research

Korea Photovoltaic Society (한국태양광발전학회)
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Thin Film Si-Ge/c-Si Tandem Junction Solar Cells with Optimum Upper Sub- Cell Structure

  • Park, Jinjoo (Major of Energy and Applied Chemistry, Division of Energy & Optical Technology Convergence, Cheongju University)
  • Received : 2020.09.09
  • Accepted : 2020.09.14
  • Published : 2020.09.30
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Abstract

This study was trying to focus on achieving high efficiency of multi junction solar cell with thin film silicon solar cells. The proposed thin film Si-Ge/c-Si tandem junction solar cell concept with a combination of low-cost thin-film silicon solar cell technology and high-efficiency c-Si cells in a monolithically stacked configuration. The tandem junction solar cells using amorphous silicon germanium (a-SiGe:H) as an absorption layer of upper sub-cell were simulated through ASA (Advanced Semiconductor Analysis) simulator for acquiring the optimum structure. Graded Ge composition - effect of Eg profiling and inserted buffer layer between absorption layer and doped layer showed the improved current density (Jsc) and conversion efficiency (η). 13.11% conversion efficiency of the tandem junction solar cell was observed, which is a result of showing the possibility of thin film Si-Ge/c-Si tandem junction solar cell.

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References

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