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Effect of growth gas flow rate on the SiC crystal resistivity

Published online by Cambridge University Press:  03 July 2012

Shenghuang Lin  and
Zhiming Chen
Shenghuang Lin*
Affiliation:
Department of Electronic Engineering, Xi’an University of Technology, Xi’an 710048, Peoples Republic of China
Zhiming Chen
Affiliation:
Department of Electronic Engineering, Xi’an University of Technology, Xi’an 710048, Peoples Republic of China
*
a)Address all correspondence to this author. e-mail: shenghuanglin@163.com
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Abstract

A technique of controlling growth gas flow rate for adjusting crystal resistivity is presented in this paper. The experimental results showed that high growth gas flow rate could affect SiC crystal resistivity remarkably. The SiC crystal resistivity would get higher and higher with increasing growth gas flow rate. The purifying effect of gas flow rate was contributing to resistivity increase at a relatively low flow rate range. As for the high gas flow rate, increase of resistivity might be explained by the well-known site competition effect. Then, one explanation for reducing nitrogen content in the crystal via increasing gas flow rate was put forward. Namely, the Si component in the gas species may more easily go through the graphite crucible at the initial stage to make the growth ambient C-rich when the gas flow rate is ∼800 sccm or more and hence suppress nitrogen incorporation into carbon site to increase crystal resistivity. This result is very helpful to grow high purity high resistivity SiC ingots.

Keywords

SiCphysical vapor transportresistivitygrowth gas flow rate
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 1: Focus Issue: Silicon Carbide – Materials, Processing and Devices , 14 January 2013 , pp. 23 - 27
Copyright
Copyright © Materials Research Society 2012

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