Patent ID: 8017508

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming a silicon nitride oxide film having a thickness of greater than or equal to 40 nm and less than or equal to 60 nm, a silicon oxynitride film having a thickness of greater than or equal to 80 nm and less than or equal to 120 nm, and an amorphous semiconductor film having a thickness of greater than or equal to 50 nm and less than or equal to 80 nm sequentially by a plasma CVD method over a glass substrate having a thickness of greater than or equal to 0.5 mm and less than or equal to 1.2 mm; heating the silicon nitride oxide film, the silicon oxynitride film, and the amorphous semiconductor film at greater than or equal to 500° C. and less than or equal to 650° C.; and irradiating the silicon nitride oxide film, the silicon oxynitride film, and the amorphous semiconductor film with a pulsed ultraviolet laser beam having a width of less than or equal to 100 μm, a ratio of width to length of 1:500 or more, and a full width at half maximum of a laser beam profile of less than or equal to 50 μm, so as to melt the semiconductor film and to grow crystal grains of the semiconductor film in a direction horizontal to the glass substrate, wherein total stress of the silicon nitride oxide film, the silicon oxynitride film, and the amorphous semiconductor film is greater than or equal to −500 N/m and less than or equal to −16 N/m.