Numerical Modeling of Front Contact Alignment for High Efficiency Cd1-xZnxTe and Cd1-xMgxTe Solar Cells for tandem devices

POSTER

Abstract

Wide bandgap Cd1-xZnxTe and Cd1-xMgxTe have drawn attention as top cells in tandem devices. These materials offer flexibility of tuning the band gap over a wide range by controlling the Zn (or Mg) concentration in CdTe with little alteration to its properties. Historically, CdS has been extensively used as a heterojunction partner for these devices. However, these devices show significantly low open circuit voltage than expected for wide bandgap absorbers due to poor band alignment at the CdS-absorber interface. Recent work shows that, by using wide band gap oxides to create this energetic “spike” at the window layer-absorber interface, device performance can be significantly improved. In this study, we will use SCAPS 1D software to model the wider band gap Cd1-xZnxTe and Cd1-xMgxTe devices to determine the appropriate alignment between the absorber and the window layer. We will also investigate how the material properties of TCO and window layer will affect the front contact alignment to determine the optimized device structure for high efficiency Cd1-xZnxTe and Cd1-xMgxTe.

Presenters

  • Geethika K Liyanage

    Wright Center for Photovoltaics Innovation and Commercialization, Department of Physics and Astronomy, University of Toledo, Toledo, OH, 43606, USA, University of Toledo, University of Toledo, Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo, Department of Physics and Astronomy, Toledo, Ohio, 43606, USA

Authors

  • Geethika K Liyanage

    Wright Center for Photovoltaics Innovation and Commercialization, Department of Physics and Astronomy, University of Toledo, Toledo, OH, 43606, USA, University of Toledo, University of Toledo, Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo, Department of Physics and Astronomy, Toledo, Ohio, 43606, USA

  • 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

  • Fadhil K. Alfadhili

    Wright Center for Photovoltaics Innovation and Commercialization, Department of Physics and Astronomy, University of Toledo, Toledo, OH, 43606, USA, The 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