Patent ID: 9064929
Filing Date: 2015-06-23
Classification: H01L

Abstract:
1. A method for manufacturing an SOI wafer comprising at least: a step of preparing a handle wafer and a donor wafer formed of a silicon substrate, the handle wafer being selected from the group consisting of a quartz wafer, a glass wafer, an alumina (sapphire) wafer, a SiC wafer, and an aluminum nitride wafer; an ion implantation step of implanting at least one of a hydrogen ion and a rare gas ion into the donor wafer to form an ion implanted layer; a bonding step of bonding an ion implanted surface of the donor wafer to a bonding surface of the handle wafer; a delamination step of delaminating the donor wafer at the ion implanted layer to reduce a film thickness of the donor wafer, thereby providing an SOI layer; and an etching step of etching the SOI layer to reduce a thickness of the SOI layer, wherein: the etching step includes: the method is performed without forming an etch stop layer, and an etching removal on the precise etching stage is set smaller than an etching removal on the rough etching stage and is set in a range of 10 nm to 100 nm.