Reduction of oxygen impurity at GaN/beta-Si(3)N(4)/Si interface via SiO(2) to Ga(2)O conversion by exposing of Si surface under Ga flux

Kumar, Mahesh and Rajpalke, Mohana K and Roul, Basanta and Bhat, Thirumaleshwara N and Dash, S and Tyagi, AK and Kalghatgi, AT and Krupanidhi, SB (2011) Reduction of oxygen impurity at GaN/beta-Si(3)N(4)/Si interface via SiO(2) to Ga(2)O conversion by exposing of Si surface under Ga flux. In: Journal of Crystal Growth, 327 (1). pp. 272-275.

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Abstract

The removal of native oxide from Si (1 1 1) surfaces was investigated by X-ray photoelectron spectroscopy (XPS) and secondary ion mass spectra (SIMS) depth profiles. Two different oxide removal methods, performed under ultrahigh-vacuum (UHV) conditions, were carried out and compared. The first cleaning method is thermal desorption of oxide at 900 degrees C. The second method is the deposition of metallic gallium followed by redesorption. A significant decrease in oxygen was achieved by thermal desorption at 900 degrees C under UHV conditions. By applying a subsequent Ga deposition/redesorption, a further reduction in oxygen could be achieved. We examine the merits of an alternative oxide desorption method via conversion of the stable SiO(2) surface oxide into a volatile Ca(2)O oxide by a supply of Ga metals. Furthermore, ultra thin films of pure silicon nitride buffer layer were grown on a Si (1 1 1) surface by exposing the surface to radio-frequency (RF) nitrogen plasma followed by GaN growth. The SIMS depth profile shows that the oxygen impurity can be reduced at GaN/beta-Si(3)N(4)/Si interfaces by applying a subsequent Ga deposition/redesorption. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Crystal Growth
Publisher:	Elsevier Science B.V.
Additional Information:	Copyright of this article belongs to Elsevier Science B.V.
Keywords:	Desorption;X-ray photoelectron spectroscopy;Molecular beam epitaxy;Nitrides
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	30 Aug 2011 05:51
Last Modified:	30 Aug 2011 05:51
URI:	http://eprints.iisc.ac.in/id/eprint/40043

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