Patent ID: 8623715

Claim:
A method for fabricating a thin-film semiconductor device for display, the method comprising: preparing a glass substrate; forming, above the glass substrate, an undercoat layer for inhibiting diffusion of an impurity in the glass substrate, the undercoat layer including a nitride film; forming a metal layer comprising molybdenum above the undercoat layer; forming a gate electrode from the metal layer by a predetermined etching process; forming a gate insulating film above the gate electrode; forming a non-crystalline silicon layer above the gate insulating film; forming a polysilicon layer by annealing the non-crystalline silicon layer at a temperature in a range from 700° C. to 1400° C., the non-crystalline silicon layer being crystallized by the annealing; forming a source electrode and a drain electrode above the polysilicon layer; and performing hydrogen plasma treatment at least once at a stage after the metal layer is formed and before the polysilicon layer is formed, the hydrogen plasma treatment being performed toward at least a region in the undercoat layer on which the gate electrode is formed, wherein a radio frequency power when performing the hydrogen plasma treatment is in a range from 0.098 W/cm 2 to 0.262 W/cm 2 .