Patent ID: 9446938
Filing Date: 2016-09-20
CPC Classification: B81B,B81C,G01L,G01P,H01L

Claim Text:
1. A SOI substrate manufacturing method, comprising: preparing a first substrate made of a silicon substrate having one surface; forming a recessed portion on the one surface of the first substrate; performing thermal oxidation of the first substrate, and forming a thermal oxide film; and bonding a second substrate to the one surface of the first substrate through the thermal oxide film, wherein: after the forming of the thermal oxide film, when a periphery portion of the one surface of the first substrate around an opening of the recessed portion is set as a boundary area, and an area of the one surface of the first substrate surrounding the boundary area and being greater than the area of the boundary area is set as a periphery area, adjusting of the thermal oxide film to set a thickness of a portion of the thermal oxide film formed in the boundary area to be equal to or smaller than a thickness of a portion of the thermal oxide film formed in the periphery area is performed; and the portion of the thermal oxide film formed in the periphery area is bonded with the second substrate in the bonding of the second substrate.