Patent ID: 8927329
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising: forming a first base film over a substrate; forming a second base film over the first base film; removing water and hydrogen contained in the first base film and the second base film while desorption of oxygen from the first base film and the second base film is suppressed by performing a first heat treatment on the substrate; after performing the first heat treatment, forming an oxide semiconductor film over the second base film; and supplying oxygen from the first base film to the oxide semiconductor film through the second base film by performing a second heat treatment on the substrate; wherein the first base film is an insulating oxide film from which oxygen is released by the second heat treatment, wherein an oxygen diffusion coefficient of the second base film is smaller than that of the first base film, and wherein the second heat treatment is performed at a temperature higher than a temperature of the first heat treatment and lower than or equal to 450° C.