Temperature gradient induced phase transitions and morphological changes in diamond thin film

Misra, Abha (2012) Temperature gradient induced phase transitions and morphological changes in diamond thin film. In: JOURNAL OF CRYSTAL GROWTH, 343 (1). pp. 127-132.

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Abstract

The diamond films were deposited onto a wurtzite gallium nitride (GaN) thin film substrate using hot-filament chemical vapor deposition (HFCVD). During the film deposition a lateral temperature gradient was imposed across the substrate by inclining the substrate. As grown films predominantly showed the hexagonal phase, when no inclination was applied to the substrate. Tilting the substrate with respect to the heating filament by 6 degrees imposed a lateral temperature gradient across the substrate, which induced the formation of a cubic diamond phase. Diamond grains were predominantly oriented in the (100) direction. However, a further increase in the substrate tilt angle to 12 degrees, resulted in grains oriented in the (111) direction. The growth rate and hence the morphology of diamond grains varied along the inclined substrate. The present study focuses on the measurements of dominant phase formation and crystal orientation with varying substrate inclination using orientation-imaging microscopy (OIM). This technique enables direct examination of individual diamond grains and their crystallographic orientation. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF CRYSTAL GROWTH
Publisher:	Elseier
Additional Information:	Copyright for this article belongs to Elsevier
Keywords:	Crystal morphology; Crystal structure; Substrate; Chemical vapor deposition process; Diamond
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	06 Aug 2012 10:51
Last Modified:	06 Aug 2012 10:51
URI:	http://eprints.iisc.ac.in/id/eprint/44516

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