Patent ID: 8835235
Filing Date: 2014-09-16
Classification: H01L

Abstract:
1. A method for fabricating a thin-film semiconductor device 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 barrier layer above the undercoat layer; forming a metal layer comprising molybdenum above the barrier layer; forming a gate electrode from the metal layer by an 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 900° C. for at least 1 second using a rapid thermal annealing (RTA), the non-crystalline silicon layer being crystallized by the annealing; and forming a source electrode and a drain electrode above the polysilicon layer, wherein the barrier layer comprises an element having a bonding force with an oxygen atom greater than that of the molybdenum or a compound of the element, and at least part of the barrier layer changes into a layer comprising oxygen atoms as a major component by the annealing when forming the polysilicon layer.