Synergistic effect of reactor chemistry and compressive stress on dislocation bending during GaN growth

Nagaboopathy, Mohan and Ravishankar, Narayanan and Raghavan, Srinivasan (2013) Synergistic effect of reactor chemistry and compressive stress on dislocation bending during GaN growth. In: APPLIED PHYSICS LETTERS, 103 (4).

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Abstract

The synergistic effect of compressive growth stresses and reactor chemistry, silane presence, on dislocation bending at the very early stages of GaN growth has been studied using in-situ stress measurements and cross-sectional transmission electron microscopy. A single 100 nm Si-doped GaN layer is found to be more effective than a 1 mu m linearly graded AlGaN buffer layer in reducing dislocation density and preventing the subsequent layer from transitioning to a tensile stress. 1 mu m crack-free GaN layers with a dislocation density of 7 x 10(8)/cm(2), with 0.13 nm surface roughness and no enhancement in n-type background are demonstrated over 2 inch substrates using this simple transition scheme. (C) 2013 AIP Publishing LLC.

Item Type:	Journal Article
Publication:	APPLIED PHYSICS LETTERS
Publisher:	AMER INST PHYSICS
Additional Information:	Copyright of this article is belongs to AMER INST PHYSICS
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	24 Sep 2013 07:30
Last Modified:	24 Sep 2013 07:30
URI:	http://eprints.iisc.ac.in/id/eprint/47299

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