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Influence of GaN underlayer thickness on structural, electrical and optical properties of InN films grown by PAMBE

Roul, Basanta and Rajpalke, Mohana K and Bhat, Thirumaleshwara N and Kumar, Mahesh and Kalghatgi, AT and Krupanidhi, SB (2012) Influence of GaN underlayer thickness on structural, electrical and optical properties of InN films grown by PAMBE. In: Journal of Crystal Growth, 354 (1). pp. 208-211.

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Official URL: http://dx.doi.org/10.1016/j.jcrysgro.2012.06.021

Abstract

We present an extensive study on the structural, electrical and optical properties of InN thin films grown on c-Al2O3, GaN(130 nm)/Al2O3, GaN(200 nm)/Al2O3 and GaN(4 mu m)/Al2O3 by using plasma-assisted molecular beam epitaxy. The high resolution X-ray diffraction study reveals better crystalline quality for the film grown on GaN(4 mu m)/Al2O3 as compared to others. The electronic and optical properties seem to be greatly influenced by the structural quality of the films, as can be evidenced from Hall measurement and optical absorption spectroscopy. Kane's k.p model was used to describe the dependence of optical absorption edge of InN films on carrier concentration by considering the non-parabolic dispersion relation for carrier in the conduction band. Room temperature Raman spectra for the InN films grown on GaN show the signature of residual tensile stress in contrast to the compressive stress observed for the films grown directly on c-Al2O3. (C) 2012 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: High Resolution X-Ray Diffraction; Molecular Beam Epitaxy; Nitrides
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 22 Feb 2013 12:09
Last Modified: 22 Feb 2013 12:10
URI: http://eprints.iisc.ac.in/id/eprint/45400

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