Patent ID: 9202923
Filing Date: 2015-12-01
Classification: H01L

Abstract:
1. A semiconductor device comprising a transistor, the transistor comprising: a gate electrode; a first insulating layer over the gate electrode; an oxide semiconductor layer over the gate electrode with the first insulating layer therebetween; a second insulating layer over the oxide semiconductor layer; and a conductive layer over the oxide semiconductor layer with the second insulating layer therebetween, wherein the conductive layer is overlapped with the gate electrode, wherein each of the gate electrode and the conductive layer extends beyond both side edges of the oxide semiconductor layer in a channel width direction of the transistor so that the oxide semiconductor layer is surrounded by the gate electrode, the first insulating layer, the second insulating layer and the conductive layer, wherein the first insulating layer is in contact with a bottom surface of the oxide semiconductor layer, wherein the second insulating layer is in contact with a top surface of the oxide semiconductor layer, wherein the first insulating layer comprises silicon oxide, wherein the second insulating layer comprises silicon oxide, wherein the oxide semiconductor layer comprises a portion overlapping with the conductive layer, and wherein a length of the portion in the channel width direction of the transistor is larger than a length of the portion in a channel length direction of the transistor.