Patent ID: 7271040

Claim:
A method for manufacturing a semiconductor device comprising: ion-implanting first impurities of a first conductivity type into one surface of a semiconductor layer of a second conductivity type, for forming an impurity layer having a peak of an impurity concentration at a point of more than 0.2 μm and not more than 1.0 μm from the one surface of the semiconductor layer and at a point within a range of 10 17 -10 18 ions/cm 3 ; ion-implanting second impurities of the first conductivity type into the one surface of the semiconductor layer, for forming a contact layer having a peak of an impurity concentration at a point of not more than 0.2 μm from the one surface of the semiconductor layer and at a point of 10 19 ions/cm 3 or more; forming a first electrode on the contact layer, which is made of a metal; and forming a silicide layer between the contact layer and the first electrode by a heat treatment, for making a boundary face between the contact layer and the silicide layer coincide with the peak of the impurity concentration of the contact layer.