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Low energy proton radiation impact on 4H-SiC nMOSFET gate oxide stability

Florentin, M.; Alexandru, M.; Constant, A.; Schmidt, B.; Millán, J.; Godignon, P.

Abstract

The 4H-SiC MOSFET electrical response to 180 keV proton radiations at three different fluences has been evaluated. For a certain dose, the devices show an improvement of their electrical characteristics likely due to the N and/or H atoms diffusion inside the oxide layer. This work shows that not only the 4H-SiC material is robust to the radiation, but also a MOSFET build on this material can withstand it, and even its electrical performance results improved if submitted to an appropriate fluence.

Keywords: Charge trapping; Mobility; Proton irradiation; SiC MOSFET; Threshold voltage; Time bias stress instability

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