Patent ID: 7955949
Filing Date: 2011-06-07
Classification: H01L

Abstract:
1. A manufacturing method of an SOI substrate comprising the steps of: introducing ions into a portion of a semiconductor substrate to form a separation layer having a porous structure; forming a layer on a second substrate; bonding the semiconductor substrate and the second substrate with the layer interposed therebetween; performing a first heat treatment by which the semiconductor substrate is cleaved at the separation layer so that a part of the semiconductor substrate remains as a semiconductor layer over the second substrate; and performing a second heat treatment to the second substrate to which the semiconductor layer is bonded, wherein a temperature of the second heat treatment is equal to or higher than that of the first heat treatment; wherein the temperature of the first heat treatment is equal to or higher than 400° C. and lower than 600° C.; and wherein the temperature of the second heat treatment is equal to or lower than a strain point of the second substrate.