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Electronic band structure of far-infrared Ga1-xInxSb/InAs superlattices

Miles, R. H. and Schulman, J. N. and Chow, D. H. and McGill, T. C. (1993) Electronic band structure of far-infrared Ga1-xInxSb/InAs superlattices. Semiconductor Science and Technology, 8 (1S). S102-S105. ISSN 0268-1242.

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Results of tight-binding and eight-band k.p calculations of the electronic band structure of long wavelength Ga1-xInxSb/InAs superlattices are compared with experimental energy gap and absorption coefficient data. The effective masses, band splittings and absorption coefficients observed in this system illustrate the potential of these structures for application in focal plane array systems demanding high detectivities or relaxed cooling requirements. Comparisons with Hg1-xCdxTe, the industry standard, are particularly favourable at longer wavelengths (8-12 mu m and beyond), due to both a substantial reduction in tunnel currents and a suppression of impact ionization noise processes. The authors also find that the InSb- or Ga1-xInxAs-like nature of the interfaces should affect the energy gap of a Ga1-xInxSb/InAs superlattice, and that substantially larger optical absorption coefficients are to be expected in structures with InSb-like interfaces. Their calculations are in agreement with experimental absorption spectra and with observed dependences of energy gaps on interfacial chemistry, measured in samples in which the nature of the interfaces was controlled through appropriate shuttering sequences and use of interrupts during growth by molecular beam epitaxy.

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Additional Information:© Institute of Physics 1993. Print publication: Issue 1S (January 1993) NARROW GAP SEMICONDUCTORS 1992PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE 19-23 JULY 1992, SOUTHAMPTON UK The authors gratefully acknowledge useful discussions with R Baron of Hughes, D A Collins of Caltech, H Ehrenreich of Harvard University and D L Smith of Los Alamos National Laboratories. We are particularly grateful to H Ehrenreich for communicating results prior to publication. We thank J K Neeland for technical assistance. Parts of this work were performed under DARPA/ONR Contracts Nos N00014-89-C-0203 and N00014-89-J-3196.
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Deposited On:13 Feb 2006
Last Modified:26 Dec 2012 08:45

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