Gamma Irradiation Effects on 4H-SiC MOS Capacitors and MOSFETs

Abstract:

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The effects of gamma radiation on field effect mobility and threshold voltage have been studied for lateral n-channel 4H-SiC MOSFETs passivated with nitric oxide. MOS capacitors (n and p) and n-channel lateral MOSFETs were irradiated unbiased (floating contacts) for a total gamma dose of 6.8Mrad (Si). The MOS capacitors were used to study the radiation-induced interface traps and fixed oxide charge that affect the performance of the MOSFETs. Radiationinduced interface traps were observed near the SiC valence band edge and just above mid-gap, and field effect channel mobility was reduced by 18-20% following irradiation. Even so, 4HMOSFETs appear to be more radiation tolerant than Si devices.

Info:

Periodical:

Materials Science Forum (Volumes 527-529)

Edited by:

Robert P. Devaty, David J. Larkin and Stephen E. Saddow

Pages:

1063-1066

DOI:

10.4028/www.scientific.net/MSF.527-529.1063

Citation:

A. C. Ahyi et al., "Gamma Irradiation Effects on 4H-SiC MOS Capacitors and MOSFETs", Materials Science Forum, Vols. 527-529, pp. 1063-1066, 2006

Online since:

October 2006

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Price:

$35.00

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