Patent ID: 7776722

Claim:
A manufacturing method of a semiconductor substrate; comprising the steps of: irradiating one surface of a first single crystal semiconductor substrate with ions to form a first embrittlement layer at a predetermined depth from the one surface of the first single crystal semiconductor substrate; forming a plurality of first element formation patterns and a first dummy pattern arranged between the plurality of first element formation patterns in the one surface of the first single crystal semiconductor substrate by etching, wherein the plurality of the first element formation patterns and the first dummy pattern are arranged at a predetermined interval; providing a substrate having an insulating surface in order to superpose the first single crystal semiconductor substrate such that the surface of the first single crystal semiconductor substrate, on which the first element formation patterns and the first dummy pattern are formed, is bonded to the insulating surface; and separating the first single crystal semiconductor substrate from the plurality of first element formation patterns and the first dummy pattern by thermal treatment, so that the plurality of first element formation patterns and the first dummy pattern are left on the substrate having the insulating surface, wherein the thermal treatment is performed in a state that the first single crystal semiconductor substrate and the substrate having the insulating surface are bonded.