Patent ID: 7279390

Claim:
A method for manufacturing a Schottky diode having a breakdown voltage of greater than about 250 volts, comprising: providing a semiconductor material of a first conductivity type having first and second major surfaces, the semiconductor material comprising an epitaxial layer disposed on a semiconductor substrate, the epitaxial layer having a thickness of at least about 15 micrometers and an impurity concentration ranging from about 1×10 14 atoms per cubic centimeter to about 1×10 15 atoms per cubic centimeter; forming a guard ring of a second conductivity type in the semiconductor material, wherein the guard ring extends from about 3 micrometers to about 15 micrometers into the semiconductor material from the first major surface; forming a first dielectric material over the guard ring; and forming an electrically conductive material over a portion of the first major surface and the guard ring.