Patent ID: 8921948
Filing Date: 2014-12-30
Classification: H01L

Abstract:
1. A semiconductor device comprising: a gate electrode over a substrate; a gate insulating layer over the gate electrode; an oxide semiconductor layer over the gate insulating layer; and a source electrode and a drain electrode over the oxide semiconductor layer, wherein an entire bottom surface of the source electrode and an entire bottom surface of the drain electrode are in contact with the oxide semiconductor layer, wherein an outer edge of a first part of the oxide semiconductor layer coincides with part of an outer edge of the source electrode, wherein an outer edge of a second part of the oxide semiconductor layer coincides with part of an outer edge of the drain electrode, wherein the first part and the second part of the oxide semiconductor layer intersect with an outer edge of the gate electrode, and wherein a third part of the oxide semiconductor layer which is provided inside the outer edge of the gate electrode has a width larger than a width of each of the first part, the second part, the source electrode and the drain electrode.