Patent ID: 6844242

Claim:
A method of manufacturing an SOI wafer comprising steps of: (a) preparing a first semiconductor wafer to be a supporting substrate of said SOI wafer and a second semiconductor wafer to be an element forming layer of said SOI wafer; (b) bonding said first and said second semiconductor wafers to each other with an insulation layer interposed therebetween, thereby forming a laminated wafer; (c) preparing a boat supporting said laminated wafer; (d) mounting said laminated wafer on said boat in the state that at least a side surface of said first semiconductor wafer is not in contact with said boat; and (e) conducting heat treatment for improving bonding strength between said first and said second semiconductor wafers, said step (e) being executed after said step (d), wherein said boat prepared in said step (c) is provided with a recess having a first bottom surface and a second bottom surface placed in a position lower than said first bottom surface, and in said step (d), said laminated wafer is mounted on said boat in the state that a side surface of said second semiconductor wafer is in contact with said first bottom surface, and said side surface of said first semiconductor wafer is not in contact with said second bottom surface, said method further comprising the step of (f) forming said element forming layer of said SOI wafer by removing a surface of said second semiconductor wafer, said step (f) being executed after said step (e).