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Multivariable study on homoepitaxial diamond growth using isotopically enriched carbon-13 gas mixtures

Published online by Cambridge University Press:  31 January 2011

Gopi K. Samudrala  and
Yogesh K. Vohra
Yogesh K. Vohra*
Affiliation:
Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294-1170
*
a) Address all correspondence to this author.e-mail: [email protected]
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Abstract

We report our observations on the homoepitaxial diamond growth by microwave plasma chemical vapor deposition (MPCVD) experiments on Type Ib diamond substrates conducted by varying three independent variables. In a feed gas mixture of H2, N2, O2, and 13CH4, the amount of nitrogen was varied in the range of 0 to 4000 ppm, the amount of methane was varied from 2% CH4/H2 to 6% CH4/H2, and the substrate temperature was varied in the range of 850 to 1200 °C. We used isotopically enriched carbon-13 methane gas as the source of carbon in the plasma to clearly distinguish the grown diamond layer from the underlying substrate using Raman spectroscopy. The x-ray rocking curve measurements confirmed the homoepitaxial nature of the deposited layers with a slight increase in the full width at half-maximum for sample grown with the highest nitrogen content in the plasma. Optical and atomic force microscopy revealed dramatic changes in surface morphology with variation in each parameter. The nitrogen incorporation in carbon-13 diamond layers was monitored through photoluminescence spectroscopy of nitrogen–vacancy complexes. A twentyfold increase in diamond growth rate was clearly achieved in this multivariable study.

Keywords

Chemical vapor deposition (CVD) (deposition)DiamondEpitaxy
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 2 , February 2009 , pp. 493 - 498
Copyright
Copyright © Materials Research Society 2009

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References

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