Patent ID: 8432021
Filing Date: 2013-04-30
Classification: H01L

Abstract:
1. A manufacturing method of an SOI substrate comprising the steps of: disposing a plurality of single crystal semiconductor substrates in a plurality of depression portions of a first tray, wherein bonding layers are formed over top surfaces of the plurality of single crystal semiconductor substrates, and embrittlement layers are formed in the plurality of single crystal semiconductor substrates; bonding a base substrate and the plurality of single crystal semiconductor substrates by making the plurality of single crystal semiconductor substrates be in contact with the base substrate with the bonding layers interposed therebetween so as to bond surfaces of the bonding layers and a surface of the base substrate; detaching the first tray from the plurality of single crystal semiconductor substrates; disposing a second tray so that the plurality of single crystal semiconductor substrates overlaps with a plurality of depression portions of the second tray; and forming the base substrate with which a plurality of single crystal semiconductor layers separated from the single crystal semiconductor substrates is in contact, wherein a depth of the depression portion of the first tray is smaller than a thickness of the single crystal semiconductor substrate, wherein a depth of the depression portion of the second tray is larger than the thickness of the single crystal semiconductor substrate, and wherein the second tray is disposed without being in contact with bottom surfaces of the plurality of single crystal semiconductor substrates.