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AssigneeElectric Power Research Institute, Inc.
InventorsVictor A. K. Temple, B. Jayant Baliga
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A thyristor is protected against voltage breakover turn-on failure by selective control of the minority charge carrier lifetime in the base region and in the gate region to establish a predictable location of the voltage breakover turn-on in the gate region. Carrier lifetime modification in the selected gate region is achieved by shielding the gate region during electron irradiation of the high-lifetime silicon substrate to protect against lifetime-killing radiation defect centers, by annealling the gate region after electron irradiation to a temperature threshold known to eliminate the radiation-induced defects, or by introducing lifetime killing defects, such as gold or platinum, external to the gate region, typically by selective diffusion or localized ion implantation. As a result, a locally higher gate sub-transistor gain thyristor is attained, so that the turn-on criterion, the unity product of the base transport factor and the avalanche multiplication factor, is established at a lower voltage in the gate region than elsewhere in the thyristor device.
A thyristor semiconductor device protected against voltage breakover failure, said device for use in connection with means for applying voltage and for generating electrical currents, comprising a silicon substrate having on an obverse face an anode contact and on a reverse face a cathode contact and a gate contact, said gate contact being spaced laterally from said anode contact,
A semiconductor device protected against breakover turn-on failure and operative in connection with means for applying voltage and for generating electrical currents comprising a silicon base substrate having:
Dependencies are inferred from the claim text.