Patent ID: 6888191

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a first electrode provided on the semiconductor substrate with the intervention of a gate insulation film; a second electrode provided at least on the first electrode with the intervention of an intermediate insulation film; at least a pair of impurity regions of a second conductivity type provided in a spaced relation in the semiconductor substrate, at least one of the impurity regions comprising a low concentration impurity region, an intermediate concentration impurity region and a high concentration impurity region sequentially arranged in this order from a region located underneath at least one of the first and second electrodes; wherein the second electrode extends laterally beyond an edge of the first electrode so that the second electrode is provided over both the first electrode and at least part of at least one of the impurity regions with intervention of the intermediate insulating film; wherein the high concentration impurity region is laterally offset from and laterally spaced from the low concentration impurity region in said at least one impurity region; and wherein the high concentration impurity region is provided as being surrounded by the low concentration impurity region and the intermediate concentration impurity region, or surrounded only by the low concentration impurity region.