Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 9, Issue 6, Pages 1834-1838Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2019.2928469
Keywords
Cadmium compounds; epitaxial layers; flexible electronics; luminescence; optical microscopy; thin films; x-ray diffraction (XRD); II-VI semiconductor materials
Funding
- Department of Energy through Bay Area Photovoltaic Consortium [DE-EE0004946]
- Energy Efficiency and Renewable Energy [DE-EE0007552]
- Air Force Office of Scientific Research [FA9550-15-1-0196]
- National Science Foundation [NNCI-ECCS1542160]
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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.
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