Patent ID: 6566223
Filing Date: 2003-05-20
Classification: H01L

Abstract:
A method of making a high voltage integrated switching device, comprising the steps of:providing a bonded pair of silicon wafers separated by a layer of insulating silicon dioxide; forming a network of substantially vertical trenches in one wafer of the bonded pair to define a plurality of silicon active regions separated by the trenches, and filling the trenches between the silicon active regions with a dielectric insulating material to dielectrically isolate the silicon active regions from one another, wherein the trenches are sufficiently wide to withstand the operating voltage of the highest rated component of the circuit without breakdown when filled with said dielectric insulating material; doping the silicon active regions with a dopant material of the same conductivity type to form a region of increased concentration of that conductivity type on the floors and sidewalls of the silicon active regions; and fabricating at least one high voltage switching circuit in at least one of the silicon active regions, wherein the high voltage switching circuit is characterized by a breakdown voltage of at least 100 volts.