Patent ID: 8338827
Filing Date: 2012-12-25
Classification: C04B,H01L

Abstract:
1. A thin film transistor comprising: a gate electrode; a gate insulating film which covers the gate electrode; an oxide semiconductor layer which overlaps with the gate electrode with the gate insulating film interposed therebetween; a first electrode and a second electrode over the oxide semiconductor layer, an end portion of the first electrode and an end portion of the second electrode overlapping with the gate electrode; a first buffer layer which is in contact with the oxide semiconductor layer and the first electrode and interposed between the oxide semiconductor layer and the first electrode; and a second buffer layer which is in contact with the oxide semiconductor layer and the second electrode and interposed between the oxide semiconductor layer and the second electrode, wherein the first buffer layer and the second buffer layer include indium, gallium, zinc, oxygen, and nitrogen.