Abstract

SiNx films formed on n-SiC layers have been characterized by using scanning internal photoemission microscopy (SIPM) in a metal–insulator–semiconductor diode structure. After applying forward-biased voltage stress up to 30 V, the diode was partially degraded. SIPM clearly imaged the degradation pattern with a large photocurrent, which was consistent with the microscopy image. These results clarified that the partial degradation induced a leak path with a low energy barrier.

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