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ALLOY BROADENING OF THE NEAR-GAP LUMINESCENCE AND THE NATURAL BAND OFFSET IN SEMICONDUCTOR ALLOYS

LANGER, JM; BUCZKO, R; STONEHAM, AM; (1992) ALLOY BROADENING OF THE NEAR-GAP LUMINESCENCE AND THE NATURAL BAND OFFSET IN SEMICONDUCTOR ALLOYS. SEMICOND SCI TECH , 7 (4) 547 - 551. 10.1088/0268-1242/7/4/018. Green open access

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Abstract

The inhomogeneous broadening of the near-gap emission (bound excitons (BE) and conduction-band to acceptor (CA)) in semiconductor alloys is reanalysed using the Markoff statistical theory for fluctuations of alloy composition. We give the exact relationship between the linewidth and the Bohr radius of the bound particle. The results of our theory indicate that even in the best GaAlAs samples there is still a significant contribution from other broadening mechanisms. We also show that the linewidth ratio of the CA to BE emission lines may provide a good estimate of the natural band offset in the alloy.

Type: Article
Title: ALLOY BROADENING OF THE NEAR-GAP LUMINESCENCE AND THE NATURAL BAND OFFSET IN SEMICONDUCTOR ALLOYS
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0268-1242/7/4/018
Publisher version: http://dx.doi.org/10.1088/0268-1242/7/4/018
Language: English
Additional information: Text made available to UCL Discovery by kind permission of IOP Publishing, 2012
Keywords: MOLECULAR-BEAM EPITAXY, TRANSITION-METAL IMPURITIES, SHALLOW ACCEPTOR STATES, PHOTOLUMINESCENCE SPECTRA, ALXGA1-XAS, GROWTH, GAAS, PARAMETERS, LINEUPS, ALGAAS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/66865
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