Patent ID: 7405425

Claim:
A thin film transistor comprising: a gate electrode on a substrate; a gate insulating layer on the substrate to insulate the gate electrode; a channel pattern including: a semiconductor pattern on the gate electrode such that the semiconductor pattern overlays the gate electrode; a first conductive adhesive pattern on the semiconductor pattern; and a second conductive adhesive pattern formed on the semiconductor pattern and spaced apart from the first conductive adhesive pattern; a source electrode having a first barrier pattern, a source pattern and a first capping pattern sequentially formed on the first conductive adhesive pattern; and a drain electrode having a second barrier pattern, a drain pattern and a second capping pattern sequentially formed on the second conductive adhesive pattern; wherein each of end portions of the first capping pattern, the second capping pattern, the source pattern and the drain pattern comprises a tapered structure; the source and the drain patterns comprise a metal selected from the group consisting of aluminum, an aluminum alloy, copper, and a copper alloy; and the first and second barrier patterns comprise a metal different from that of the first and second capping patterns.