Patent ID: 7955922
Filing Date: 2011-06-07
Classification: H01L

Abstract:
1. A method for manufacturing a fin-type field effect transistor by using a SOI (Silicon On Insulator) wafer including, on a Si substrate, a buried oxide layer made of an insulating material and a single crystalline silicon layer formed thereon, the method comprising: forming a fin-shaped protrusion by selectively dry-etching the single crystalline silicon layer until the underlying buried oxide layer is exposed; forming a sacrificial oxide film by oxidizing a surface of the protrusion including a damage inflicted thereon; and forming a fin having a clean surface by removing the sacrificial oxide film by etching, wherein an oxidizing method for forming the buried oxide layer is different from an oxidizing method for forming the sacrificial oxide film, so that an etching rate r wherein both the buried oxide layer and the sacrificial oxide film are made of SiO