Bifacial CdTe/CdS solar cell using transparent Nanocomposite (CuS)x(ZnS)1-x Thin Film as a Back Contact layer

ORAL

Abstract

We report the properties of earth-abundant p-type transparent conducting nanocomposite (NC) thin film (CuS)x (ZnS)1-x, deposited by a facile and low-cost chemical bath deposition method. Our films of ~45 nm thickness show transparency ~80 % in the visible spectral region (at 550 nm) with compact grains of size < 15 nm. The purpose of fabricating of these wide band gap (~ 2.70 eV) (CuS)x (ZnS)1-x partially transparent thin films was to utilize them as back contacts to CdTe thin film solar cells. Since critical avenues to increased energy yield for CdTe PV technology, such as bifacial cell or tandem cell designs, rely on the need to develop transparent back contact approaches that enable high efficiency and high transparency. Further, when finished with a conductive transparent indium tin oxide (ITO) layer, the high transparency of the NC thin film interface layer enables back illuminated operation of the solar cell. Once optimized, and with an improved interface and bulk CdTe carrier lifetimes, this NC earth-abundant transparent conductor based on Cu, Zn, and S may serve as an effective, inexpensive, low-toxicity back contact layer for a bifacial CdTe solar cell.

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Presenters

  • Kamala K. Subedi

    The University of Toledo

Authors

  • Kamala K. Subedi

    The University of Toledo

  • Ebin Bastola

    The University of Toledo

  • Indra Subedi

    Univ of Toledo

  • Zhaoning Song

    Univ of Toledo, Wright Ctr for Photovoltaics Innovation and Commercialization, Sch. for Solar and Adv. Energy, Dept of Physics and Astronomy, Univ of Toledo, Department of Physics and Astronomy, The Wright Center for Photovoltaics Innovation and Commercialization (PVIC), University of Toledo, Toledo OH 43606, USA.

  • Khagendra P Bhandari

    Ohio Northern University

  • Adam B. Phillips

    The University of Toledo, Wright Center for Photovoltaics Innovation and Commercialization, Department of Physics and Astronomy, University of Toledo, Toledo, OH, 43606, USA, Wright Ctr for Photovoltaics Innovation and Commercialization, Sch. for Solar and Adv. Energy, Dept of Physics and Astronomy, Univ of Toledo, Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo, Department of Physics and Astronomy, Toledo, Ohio, 43606, USA

  • Nikolas Podraza

    The University of Toledo, Univ of Toledo, University of Toledo

  • Michael J. Heben

    The University of Toledo, Wright Center for Photovoltaics Innovation and Commercialization, Department of Physics and Astronomy, University of Toledo, Toledo, OH, 43606, USA, Department of Physics and Astronomy, The Wright Center for Photovoltaics Innovation and Commercialization (PVIC), University of Toledo, Toledo OH 43606, USA., Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo, Department of Physics and Astronomy, Toledo, Ohio, 43606, USA

  • Randy J. Ellingson

    University of Toledo