Patent ID: 6323521
Filing Date: 2001-11-27
Classification: H01L

Abstract:
A thin film transistor (TFT) comprising:a substrate;a gate electrode on the substrate;a gate insulating layer formed on the substrate and covering the gate electrode;an active layer on the gate insulating layer;an ohmic contact layer on the active layer and not overlapping the gate electrode; anda source electrode and a drain electrode connected to the ohmic contact layer, each of the source electrode and the drain electrode having a double-layered structure of a first metal layer having tensile stress and a second metal layer having compressive stress, the second metal layer being disposed on the first metal layer such that two side portions of the first metal layer do not have a portion of the second metal layer disposed thereon and the two side portions have the same width as each other, wherein the tensile stress of the first metal layer and the compressive stress of the second metal layer combine to prevent a hillock from occurring at the source electrode and the drain electrode.