Patent ID: 8399340

Claim:
A method of manufacturing a super-junction semiconductor device, the method comprising: growing an epitaxial layer above a heavily doped semiconductor substrate of a first conductivity type; forming an alignment mark in a surface of the epitaxial layer; implanting impurity ions of the first conductivity type or a second conductivity type into the entire epitaxial layer; patterning a resist by photolithography, the resist being used in selective impurity ion implantation into the epitaxial layer; implanting impurity ions of the second conductivity type or the first conductivity type selectively through the resist patterned; repeating a cycle comprising the growing, the implanting impurity ions into the entire epitaxial layer, the patterning, and the implanting impurity ions selectively through the resist patterned multiple times for forming a drift layer having a desired thickness, the drift layer comprising an alternating-conductivity-type-layer which comprises a first column of the first conductivity type and a second column of the second conductivity type, the first column and the second column extending in perpendicular to a substrate major surface, the first column and the second column being arranged alternately and repeatedly in parallel to the substrate major surface such that the first column and the second column are adjoining to each other; conducting patterning for forming a new alignment mark simultaneously with patterning the resist used in the selective impurity ion implantation; and forming the new alignment mark at a position different from a position, at which the alignment mark in a preceding epitaxial layer is formed, the conducting patterning being conducted simultaneously with the patterning a resist by photolithography in every one or more repeated cycles, and the forming the new alignment mark being conducted subsequent to the conducting patterning and in advance of the implanting impurity ions selectively through the resist patterned in said every one or more repeated cycles.