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Luminescence studies of HgCdTe alloys

Hunter, A. T. and McGill, T. C. (1982) Luminescence studies of HgCdTe alloys. Journal of Vacuum Science and Technology, 21 (1). pp. 205-207. ISSN 0022-5355. doi:10.1116/1.571716.

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We report the observation in Hg_(1-x)Cd_(x)Te of band-to-band, band-to-acceptor, and donor-acceptor luminescence for material of x = 0.32 and 0.5, and bound exciton recombination luminescence, for material of x = 0.5. The band-to-band lineshape and variation in intensity with pump power are appropriate to an electron-hole plasma with recombination proceeding without wave vector conservation. Differences between the spectra among the four 0. 5 samples studied are attributed to variations in the Hg vacancy concentration. Shifts in luminescence energy across one of the x = 0.32 samples imply a change in composition across the surface of the sample of 0.03 cm^(-1). The absence of bound exciton luminescence in the x = 0.32 samples is consistent with theoretical calculations by Osbourn and Smith showing a radiative efficiency of 20% for bound excitons in material of this composition and 90% for x = 0.48 material. From line shape separations, we estimate acceptor binding energies of 14.0 ± 1.0 and 15.5 ± 2.0 meV in x = 0.32 and 0.48 materials, respectively, and donor binding energies of 1.0 ± 1.0 and 4.5 ± 2.0 meV, respectively.

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Additional Information:© 1982 American Vacuum Society. Received 13 November 1981; accepted 10 February 1982. We wish to acknowledge P. Bratt and K. Riley of the Santa Barbara Research Center for providing us with HgCdTe samples, and L. DeVaux of the Hughes Research Laboratories for useful discussions on the properties of HgCdTe. Work supported in part by the Air Force Office of Scientific Research under Grant No. AFOSR-77-3216.
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Air Force Office of Scientific Research (AFOSR)AFOSR-77-3216
Subject Keywords:recombination; excitons; photoluminescence; quantity ratio; donors; acceptors; binding energy; line shape; ultralow temperature; very low temperature; mercury alloys; cadmium alloys; tellurium alloys
Issue or Number:1
Classification Code:PACS: 78.55.Hx; 71.35.-y; 78.30.Er; 78.40.Kc
Record Number:CaltechAUTHORS:20120629-111127036
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Official Citation:Luminescence studies of HgCdTe alloys A. T. Hunter and T. C. McGill, J. Vac. Sci. Technol. 21, 205 (1982), DOI:10.1116/1.571716
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32201
Deposited On:02 Jul 2012 15:46
Last Modified:09 Nov 2021 21:25

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