Patent ID: 9543449
Date: 2017-01-10
CPC Classifications: G02F,H01L

Claim:
1. A thin film transistor, comprising: a gate electrode; a channel layer containing an oxide semiconductor; a gate insulating film disposed between the gate electrode and the channel layer; a protective film; and a source electrode and a drain electrode disposed between the protective film and the channel layer wherein: at least one of the source electrode and the drain electrode, is formed of a laminated metal film comprising a lower barrier layer, a low-resistance main wiring layer, and an upper cap layer arranged in order when viewed from the channel layer toward the protective film; the low-resistance main wiring layer contains one of copper and a copper alloy; and both of the lower barrier layer and the upper cap layer contain a molybdenum alloy containing nickel and niobium, wherein the molybdenum alloy contains 10 to 40 atomic % of nickel and 4 to 20 atomic % of niobium, with the balance being molybdenum.