Patent ID: 7364954

Claim:
A method for manufacturing a semiconductor device comprising: forming a metal film over a substrate; performing plasma treatment to the metal film in an atmosphere containing oxygen to form a metal oxide film on a surface of the metal film; forming a base film over the metal oxide film; forming an element layer comprising a thin film transistor over the base film; forming a protective layer over the element layer; selectively removing the metal film, the metal oxide film, the base film, the element layer, and the protective layer to form an opening; separating the base film, the element layer, and the protective layer from the substrate; and sealing the base film, the element layer, and the protective layer by using flexible first and second films, wherein an electron density of the plasma treatment is 1×10 11 cm −3 or more and 1×10 13 cm −3 or less and an electron temperature of the plasma treatment is 0.5 eV or more and 1.5 eV or less around the substrate.