Patent ID: 8030174
Filing Date: 2011-10-04
Classification: H01L

Abstract:
1. A method for manufacturing an SOI substrate comprising: irradiating a first bond substrate covered by a first insulating layer with ions so as to form a first embrittled layer at a predetermined depth in the first bond substrate; irradiating a second bond substrate covered by a second insulating layer with ions so as to form a second embrittled layer at the predetermined depth in the second bond substrate; superposing and bonding the first and second bond substrates and a base substrate to each other with the first insulating layer interposed between the first bond substrate and the base substrate and with the second insulating layer interposed between the second bond substrate and the base substrate, respectively; and heating the first and second bond substrates to be separated at the first and second embrittled layers while a first separated layer and a second separated layer are left remaining over the base substrate, wherein the first and second separated layers are part of the first and second bond substrates, respectively, and wherein each of the steps of irradiating was conducted with a tilt angle between the first or second bond substrate and the vertical direction of larger than 10° and not larger than 90°.