Patent ID: 11967564
Assignee: DENSO CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method for manufacturing a semiconductor device, comprising:
forming an insulating film on a surface of a semiconductor layer of a semiconductor substrate;
forming a contact hole in the insulating film;
removing a part of the insulating film corresponding to a periphery of an alignment key so as to expose the semiconductor layer on the periphery of the alignment key while leaving the insulating film in a region corresponding to the alignment key to form a dissimilar material portion;
forming a conductor material on the insulting film to be in contact with the semiconductor layer through the contact hole and directly on the semiconductor layer exposed from the insulating film and the dissimilar material portion; and
patterning the conductor material using a part of the conductor material formed directly on the dissimilar material portion, as a new alignment key, based on a difference in crystallinity between the part of the conductor material formed directly on the dissimilar material and a part of the conductor material formed directly on the semiconductor layer exposed from the insulating film.