Patent ID: 7749850
Filing Date: 2010-07-06
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming an island-like semiconductor film over a substrate having an insulating surface; oxidizing or nitriding a surface of the island-like semiconductor film to form a first insulating film which is any one of an oxide film, an oxide film including nitrogen, a nitride film including oxygen, a nitride film, a film including a suboxide, and a film including a subnitride on the surface of the island-like semiconductor film; forming a semiconductor film on a region which is a part of the first insulating film; oxidizing or nitriding the surface of the island-like semiconductor film to form a second insulating film which is any one of an oxide film, an oxide film including nitrogen, a nitride film including oxygen, a nitride film, a film including a suboxide, and a film including a subnitride on the surface of the island-like semiconductor film; forming a gate electrode over the second insulating film; adding an impurity element imparting one conductivity type to the island-like semiconductor film and the semiconductor film using the gate electrode as a mask; and heating the island-like semiconductor film and the semiconductor film to activate the impurity element, wherein the first insulating film disappears by heating the island-like semiconductor film and the semiconductor film.