Patent ID: 9293598
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: an oxide semiconductor layer including a channel formation region; a first source electrode and a first drain electrode over and in contact with the oxide semiconductor layer; a second source electrode over and in contact with the first source electrode and the oxide semiconductor layer; a second drain electrode over and in contact with the first drain electrode and the oxide semiconductor layer; a first insulating layer over the second source electrode, the second drain electrode and the oxide semiconductor layer; a gate electrode over the first insulating layer; and a second insulating layer over the gate electrode wherein the gate electrode comprises a first layer and a second layer over the first layer, wherein the first layer of the gate electrode is able to reduce a concentration of hydrogen in the channel formation region, wherein the second source electrode and the second drain electrode each comprise a material layer which is able to reduce the concentration of hydrogen in the channel formation region, and wherein a length of the channel formation region is shorter than a distance between the first source electrode and the first drain electrode.