Patent ID: 9209282
Filing Date: 2015-12-08
Classification: G02F,H01L

Abstract:
1. A method of manufacturing a thin film transistor substrate including an insulating substrate, an oxide semiconductor layer provided on the insulating substrate and having a channel region, a source electrode and a drain electrode provided on the oxide semiconductor layer to face one another with the channel region interposed therebetween, and a passivation film covering the oxide semiconductor layer, the source electrode, and the drain electrode, the method comprising at least: a semiconductor layer forming step of forming the oxide semiconductor layer on the insulating substrate; a metal film forming step of forming a first conductive film provided on the oxide semiconductor layer and made of titanium or molybdenum, a second conductive film provided on the first conductive film and made of copper, and a copper-titanium alloy film provided on the second conductive film and containing titanium within a range from 20 at % to 50 at %, both inclusive; a passivation film forming step of forming a passivation film which is an inorganic insulating film on the oxide semiconductor layer, the first conductive film, the second conductive film, and the copper-titanium alloy film; and a source/drain forming step of forming the source electrode and the drain electrode, each of which is a multilayer film of the first conductive film, the second conductive film, and a third conductive film including the copper-titanium alloy film and a titanium oxide film, by annealing the oxide semiconductor layer, and forming the titanium oxide film on the surface of the copper-titanium alloy film by the annealing.