Patent ID: 8482102
Filing Date: 2013-07-09
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first conductivity type substrate; a lower doped collector layer of second conductivity type formed over the substrate; a sinker layer of second conductivity type provided in the lower doped collector layer, having a higher impurity concentration than the lower doped collector layer; a highly-doped collector layer of the second conductivity type formed in a surface layer of the sinker layer, having a higher impurity concentration than the sinker layer; an emitter layer of the second conductivity type formed in the lower doped collector layer and located away from the highly-doped collector layer, having a higher impurity concentration than the lower doped collector layer; a highly-doped base layer of the first conductivity type formed in the lower doped collector layer and electrically short-circuited with the emitter layer; a base layer of the first conductivity type located so as to contain the emitter layer and the highly-doped base layer; a first conductivity type layer formed in the lower doped collector layer, located between the sinker layer and the base layer away from the base layer, and electrically short-circuited with the highly-doped collector layer; and a second conductivity type layer formed in the lower doped collector layer and located between the base layer and the first conductivity type layer away from the first conductivity type layer, having a higher impurity concentration than the lower doped collector layer.