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Proceedings Paper

Intrinsic deep levels in semi-insulating silicon carbide
Author(s): William C. Mitchel; William D. Mitchell; Gerald Landis
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Paper Abstract

High temperature Hall effect and resistivity measurements have been made on undoped, high purity semi-insulating (HPSI) 4H SiC samples. Both physical vapor transport and high temperature chemical vapor deposition grown samples have been investigated. Resistivity measurements before and after annealing at temperatures up to 1800°C are also reported. Hall and resistivity results are compared with low temperature photoluminescence results. The thermal activation energies for HPSI material taken from temperature dependent resistivity measurements varied from 0.9 to 1.5 eV. Hall effect measurements were made on several HPSI. In all cases the material was found to be n-type and the measured carrier concentration activation energies agreed within a few tens of percent with the resistivity activation energies. Mixed conduction analysis of the data suggests that the hole concentration was negligible in all of the samples studied. This suggests that the defects responsible for the semi-insulating properties have deep levels located in the upper half of the bandgap.

Paper Details

Date Published: 6 July 2004
PDF: 6 pages
Proc. SPIE 5359, Quantum Sensing and Nanophotonic Devices, (6 July 2004); doi: 10.1117/12.519597
Show Author Affiliations
William C. Mitchel, Air Force Research Lab. (United States)
William D. Mitchell, Air Force Research Lab. (United States)
Gerald Landis, Air Force Research Lab. (United States)
Univ. of Dayton Research Institute (United States)

Published in SPIE Proceedings Vol. 5359:
Quantum Sensing and Nanophotonic Devices
Manijeh Razeghi; Gail J. Brown, Editor(s)

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