Materials Science Forum, Vol.433-4, 819-822, 2002
Low power dissipation SiC Schottky rectifiers with a dual-metal planar structure
Dual-metal-planar rectifiers were fabricated on both 6H- and 4H-SiC using Ti and Ni2Si as Schottky metals. The for-ward IN characteristics of the dual-metal devices were comparable with those of Ti diodes. On the other hand, under reverse bias, a low leakage current level similar to the Ni2Si rectifiers was achieved, e.g. on 6H-SiC even a factor 1000 lower than Ti diodes. The fabricated diodes allowed to obtain a power dissipation in the range 0.37-0.53 W/cm(2), significantly lowered with respect to the Ti and Ni2Si diodes dissipation. The results were explained with the pinch-off of the low Schottky barrier of Ti by the surrounding high barrier of Ni2Si in reverse bias.
Keywords:dual-metal;pinch Schottky rectifiers