Monocrystalline 1.7-eV-Bandgap MgCdTe Solar Cell With 11.2% Efficiency

Jacob J. Becker, Calli M. Campbell, Cheng Ying Tsai, Yuan Zhao, Maxwell Lassise, Xin Hao Zhao, Mathieu Boccard, Zachary Holman, Yong-Hang Zhang

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

This work demonstrates a monocrystalline 1.7 eV Mg<formula><tex>$_{0.13}$</tex></formula>Cd<formula><tex>$_{0.87}$</tex></formula>Te solar cell with an open-circuit voltage of 1.176 V and an active-area efficiency of 11.2&#x0025;. The absorber layer is clad in wider bandgap passivation layers that effectively confine electrons and holes via the resulting band offsets. The potential barriers cladding the absorber are generated using higher magnesium compositions than the absorber and provide excellent carrier confinement. This ultimately leads to long minority carrier lifetimes (&#x003E;500 ns) and high photoluminescence quantum efficiencies yielding an implied open-circuit voltage of 1.3 V. However, the same barriers at the heterointerfaces reduce fill factor by impeding transport; this is apparent as series resistance losses that can be overcome with operation at higher temperatures. The photocurrent loss mechanisms are simulated and analyzed, laying out the pathway for further improvements in current generation and, thus, efficiency.

Original languageEnglish (US)
JournalIEEE Journal of Photovoltaics
DOIs
StateAccepted/In press - Jan 8 2018

Keywords

  • Cadmium compounds
  • CdTe
  • DH-HEMTs
  • Doping
  • double heterostructure (DH)
  • II-VI semiconductor materials
  • MgCdTe
  • monocrystalline
  • Photonic band gap
  • Photovoltaic cells
  • Photovoltaic systems
  • photovoltaics (PV)
  • tandem1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Becker, J. J., Campbell, C. M., Tsai, C. Y., Zhao, Y., Lassise, M., Zhao, X. H., Boccard, M., Holman, Z., & Zhang, Y-H. (Accepted/In press). Monocrystalline 1.7-eV-Bandgap MgCdTe Solar Cell With 11.2&#x0025; Efficiency. IEEE Journal of Photovoltaics. https://doi.org/10.1109/JPHOTOV.2017.2769105