Patent ID: 7307007
Filing Date: 2007-12-11
Classification: H01L

Abstract:
1. A method for forming a semiconductor device comprising: flattening an insulating layer; forming a semiconductor film comprising silicon over the flattened insulating layer; providing the semiconductor film comprising silicon with an element for promoting crystallization of silicon; crystallizing the semiconductor film comprising silicon provided with the element for promoting crystallization of silicon; and subsequently subjecting the semiconductor film comprising silicon to heat treatment to reduce the element for promoting crystallization of silicon in the semiconductor film comprising silicon and to form a first part of the semiconductor film comprising silicon to become an active layer of the semiconductor device and to form a thermal oxidation film over the first part to become the active layer by thermal oxidation of a second part of the semiconductor film comprising silicon, wherein the first part of the semiconductor film comprising silicon has a final thickness of the active layer of the semiconductor device from 10 nm to 75 nm.