This paper reports an epitaxial lift-off (ELO) method that uses water-soluble MgTe to obtain free-standing single-crystal CdTe/MgCdTe double-heterostructure (DH) thin films from samples grown monolithically on lattice-matched InSb substrates. Photoluminescence measurements on as-grown and free-standing films reveal that the optical quality of the DH survives ELO. This method potentially enables substantial increases in the conversion efficiencies of thin-film solar cells through enhancement of the photon-recycling effect. This process holds promise in multijunction PV applications that considers the integration of a 1.7-eV MgCdTe top cell and a crystalline Si bottom cell to form a tandem device with efficiency potentially higher than 30%. Additionally, the method can be applied to other families of devices, such as infrared photodetectors.

Original languageEnglish (US)
Article number8795510
Pages (from-to)1834-1838
Number of pages5
JournalIEEE Journal of Photovoltaics
Issue number6
StatePublished - Nov 2019


  • Cadmium compounds
  • II-VI semiconductor materials
  • epitaxial layers
  • flexible electronics
  • luminescence
  • optical microscopy
  • thin films
  • x-ray diffraction (XRD)

ASJC Scopus subject areas

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


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