A semiconductor rectifying diode includes a first semiconductor region of one conductivity type, a plurality of third semiconductor regions of the other conductivity type provided on one surface of said first semiconductor region to be spaced a distance W, and a main electrode provided on said one main...http://www.google.com.au/patents/US5081509?utm_source=gb-gplus-sharePatent US5081509 - Semiconductor rectifying diode with pn geometry
