Patent ID: 7737012

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming an amorphous layer in a region from a surface of a semiconductor region of a first conductivity type to a first depth; by performing a first heat treatment of the amorphous layer at a prescribed temperature, restoring a crystal structure of the amorphous layer in a region from the first depth to a second depth that is shallower than the first depth so that the amorphous layer shrinks to the second depth; after the first heat treatment, forming a first impurity layer of a second conductivity type which has a pn junction at a third depth that is shallower than the second depth by introducing ions into the amorphous layer extending from the surface of the semiconductor region to the second depth; and performing a second heat treatment of the amorphous layer in a region from the surface of the semiconductor region to the second depth using solid phase epitaxy and restoring a crystal structure of the amorphous layer in a region from the surface of the semiconductor region to the second depth.