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Optical properties of thick GaInAs(Sb)N layers grown by liquid-phase epitaxy
Sofia University, Bulgaria.
Sofia University, Bulgaria; Imperial Coll London, England.
Central Lab Appl Phys, Bulgaria.
Imperial Coll London, England.
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2017 (English)In: 19TH INTERNATIONAL SCHOOL ON CONDENSED MATTER PHYSICS (ISCMP): ADVANCES IN NANOSTRUCTURED CONDENSED MATTER: RESEARCH AND INNOVATIONS, IOP PUBLISHING LTD , 2017, Vol. 794, UNSP 012013Conference paper, Published paper (Refereed)
Abstract [en]

We present an experimental and theoretical study of GaInAs(Sb)N layers with thickness around 2 mu m, grown by liquid-phase epitaxy (LPE) on n-type GaAs substrates. The samples are studied by surface photovoltage (SPV) spectroscopy and by photoluminescence spectroscopy. A theoretical model for the band structure of Sb-containing dilute nitrides is developed within the semi-empirical tight-binding approach in the sp(3)d(5)s*s(N) parameterisation and is used to calculate the electronic structure for different alloy compositions. The SPV spectra measured at room temperature clearly show a red shift of the absorption edge with respect to the absorption of the GaAs substrate. The shifts are in agreement with theoretical calculations results obtained for In, Sb and N concentrations corresponding to the experimentally determined ones. Photoluminescence measurements performed at 300K and 2 K show a smaller red shift of the emission energy with respect to GaAs as compared to the SPV results. The differences are explained by a tail of slow defect states below the conduction band edge, which are probed by SPV, but are less active in the PL experiment.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 794, UNSP 012013
Series
Journal of Physics Conference Series, ISSN 1742-6588
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-139307DOI: 10.1088/1742-6596/794/1/012013ISI: 000403943500013OAI: oai:DiVA.org:liu-139307DiVA: diva2:1120948
Conference
19th International School on Condensed Matter Physics (ISCMP) - Advances in Nanostructured Condensed Matter - Research and Innovations
Note

Funding Agencies|research fund of the Sofia University [114/2016]; COST action 1406 MutiscaleSolar

Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-08-27

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Ivanov, Ivan Gueorguiev
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