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Rusch, Oleg
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article
Reducing On-Resistance for SiC Diodes by Thin Wafer and Laser Anneal Technology
Abstract
S.155-160 ; This work presents the influence of Thin Wafer und Laser Anneal Technology on the electrical performance of 4HSiC devices. Substrate thinning and backside ohmic contact formation via laser annealing were successfully applied to in-house designed and manufactured 6 A 650 V SiC diodes at IISB, improving its forward characteristics. The given devices exhibit an on-state voltage drop (VF) reduction from 1.78 V to 1.62 V at 6 A rated current while maintaining blocking capabilities of more than 1.1 kV with leakage currents less than 1 mA at 650 V nominal voltage. On-resistance (RON) was lowered by approx. 30 % to 90 mO and 60 % to 12 mO in Schottky and conductivity modulation state, respectively. Wafer thinning also allows reducing the influence of non-homogeneous distributed substrate doping concentrations, leading to a more narrow distribution of the forward characteristics of the devices across the wafer.