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Proceedings Article

Molecular beam epitaxial growth of CdTe and related II-VI materials on Si for the fabrication of infrared detectors and solar cells

[+] Author Affiliations
Sivalingam Sivananthan, Michael Carmody, Chollada Gilmore, James Garland

EPIR Technologies, Inc. (USA)

Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 79951V (February 17, 2011); doi:10.1117/12.888643
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From Conference Volume 7995

  • Seventh International Conference on Thin Film Physics and Applications
  • Junhao Chu; Zhanshan Wang
  • Shanghai, China | September 24, 2010

abstract

CdTe/Si substrates with etch-pit densities ~5 x 104 - 2 x105 cm-2 and x-ray diffraction full-width at half-maximum <60 arcsec over >60% of a 3" substrate and ≤85 arcsec over the entire area are now available. Midwave and shortwave HgCdTe infrared detectors fabricated on these substrates have device characteristics as good as those of detectors fabricated on lattice-matched CdZnTe substrates. Also, minority carrier lifetimes of 100s of nanoseconds are measured for CdTe/Si and CdZnTe/Si, and both can be p-doped 1017 cm-3 and n-doped >1020 cm-3. Calculations suggest that the use of these materials should yield multijunction solar cells with efficiencies higher than those of the corresponding III-V multijunction cells at much lower cost, using rugged, large-area, inexpensive active Si substrates. The first CdZnTe/Si single-junction solar cells fabricated by EPIR displayed an electronic-charge times open-circuit voltage, qVoc, within ~0.45 eV of the CdZnTe bandgap Eg, as good a result as that for the best III-V alloy single-junction cells, and confirmed the suitability of single-crystal CdZnTe/Si for the manufacture of high-efficiency solar cells.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Sivalingam Sivananthan ; Michael Carmody ; Chollada Gilmore and James Garland
"Molecular beam epitaxial growth of CdTe and related II-VI materials on Si for the fabrication of infrared detectors and solar cells", Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 79951V (February 17, 2011); doi:10.1117/12.888643; http://dx.doi.org/10.1117/12.888643


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