Patent ID: 9607880
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. A method of manufacturing a silicon-on-insulator (SOI) substrate, comprising: forming a thinning stop layer within a first semiconductor substrate distanced from a first surface of the first semiconductor substrate; forming an island-shaped insulating layer on a first region of the first surface of the first semiconductor substrate; forming a silicon epitaxial layer on the first surface of the first semiconductor substrate so as to cover the island-shaped insulating layer and a second region of the first surface of the first semiconductor substrate, wherein the silicon epitaxial layer has a uniform thickness over the first surface of the first semiconductor substrate; forming a trench by selectively etching the first region of the silicon epitaxial layer so as to expose a portion of the island-shaped insulating layer; forming a first insulating adhesive layer on the second region of the silicon epitaxial layer and the island-shaped insulating layer, wherein the first semiconductor substrate has a first thickness of the first surface in the first region that is determined by a distance between the thinning stop layer and the island-shaped insulating layer, and wherein the first semiconductor substrate has a second thickness of the first surface in the second region that is determined by a sum of the first thickness and the uniform thickness of the silicon epitaxial layer; and thinning the first semiconductor substrate from a second surface of the first semiconductor substrate, wherein the second surface is on an opposing side of the first surface of the first semiconductor substrate; and wherein the thinning of the first semiconductor substrate includes a coarse grinding process to remove a part of the first semiconductor substrate before reaching the thinning stop layer and a fine grinding process to remove the thinning stop layer.