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Author: Shibata, H. ×

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  • Publication
    Analysis for Efficiency Potential of II-VI Compound, Chalcopyrite, and Kesterite-Based Tandem Solar Cells
    ( 2022)
    Yamaguchi, Masafumi
    ;
    Tampo, H.
    ;
    Shibata, H.
    ;
    Schygulla, Patrick orcid-logo
    ;
    Dimroth, Frank
    ;
    Kojima, N.
    ;
    Oshita, Y.
    The development of high-performance solar cells offers a promising pathway toward achieving high power per unit cost for many applications. As single-junction solar cells are limited to 30-32% conversion efficiency under 1-sun, multi-junction or tandem solar cells are expected to contribute to higher performances. The II-VI compound, chalcopyrite, and kesterite-based tandem solar cells are expected as high-efficiency and low-cost solar cells. This paper presents analytical results for efficiency potential and loss elements of II-VI compound, chalcopyrite, and kesterite-based tandem solar cells. The 2-junction and 3-junction tandem solar cells have potential efficiencies of 36% and 42%, respectively, by improving external radiative efficiency and reducing resistance and optical losses. Some paths for improving efficiencies of tandem solar cells are shown by analyzing their loss elements. Optimization of band-gap energy of sub-cells and photon recycling are also recommended.