Patent ID: 8900962
Filing Date: 2014-12-02
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a base region and an emitter region in a front surface of a semiconductor layer; forming a first impurity implantation region by implanting first impurity of a first conductivity type into a back surface of the semiconductor layer; selectively forming a second impurity implantation region by selectively implanting second impurity of a second conductivity type into the first impurity implantation region; and irradiating the first impurity implantation region and the second impurity implantation region with laser light, a peak of impurity concentration profile in a depth direction of at least one of the first impurity implantation region and the second impurity implantation region before irradiation with the laser light being adjusted to a depth of 0.05 μm or more and 0.3 μm or less from the back surface of the semiconductor layer, and after etching a surface of the first impurity implantation region, the second impurity being implanted into the first impurity implantation region.