Patent ID: 7935585

Claim:
A method for fabricating a semiconductor device, comprising: forming a silicon film having a thickness of 0.051 μm or less on a glass substrate; and recrystallizing the silicon film by causing a flame, as a heat source, of a gas burner that uses a hydrogen and oxygen gas mixture as a fuel to relatively scan the glass substrate, the gas burner including: (a) a shield defining a combustion compartment and having a nozzle that is spaced from the glass substrate a distance of 0.05 m or less, and (b) a guide tube disposed within the combustion compartment, supplying the fuel to the combustion compartment, and having a plurality of gas flow outlets that emit the fuel into the combustion compartment, wherein the guide tube is movable within the combustion compartment, wherein the flame of the gas burner scans the glass substrate at a scanning speed of 0.03 m/s or higher but not more than 0.04 m/s so as to keep a thermal diffusion length that is 0.8 to 0.04 mm on the glass substrate during the recrystallization of the silicon film, thereby the recrystallization is accomplished by solid phase recrystallization, a surface temperature of the glass substrate during the recrystallization is 670 to 750° C., and the method for fabricating further includes moving the guide tube within the combustion compartment, thereby adjusting a distance between the guide tube and the nozzle.