Patent ID: 9034721
Filing Date: 2015-05-19
Classification: H01L,Y10S

Abstract:
1. A method for manufacturing a semiconductor substrate, comprising: preparing a substrate made of a single crystal semiconductor; forming a semiconductor layer made of a single crystal on the surface of the substrate; arranging, on the semiconductor layer, a mask material having a device formation region and an alignment region of the semiconductor layer each including an opening; etching the semiconductor layer, covered by the mask material, to simultaneously form an alignment mark formation trench in the alignment region and a device trench in the device formation region; removing the mask material; burying an epitaxial film in the device trench and partially filling the alignment mark formation trench with the epitaxial film simultaneously to form buried voids in the alignment mark formation trench; and subjecting a part of the epitaxial film that is formed outside of the device trench to a planarization processing.