Patent ID: 9123573
Filing Date: 2015-09-01
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first gate electrode layer; a first insulating film over the first gate electrode layer; an oxide semiconductor stacked film over the first insulating film; and a pair of electrode layers in contact with the oxide semiconductor stacked film, wherein the oxide semiconductor stacked film comprises: wherein each of the first oxide semiconductor layer, the second oxide semiconductor layer, and the third oxide semiconductor layer comprises indium, wherein a content percentage of indium in the second oxide semiconductor layer is higher than a content percentage of indium in the first oxide semiconductor layer and a content percentage of indium in the third oxide semiconductor layer, wherein an absorption coefficient of a channel formation region in the oxide semiconductor stacked film, which is measured by the CPM, is lower than or equal to 3×10 wherein a conduction band of each of the first oxide semiconductor layer and the third oxide semiconductor layer is higher than a conduction band of the second oxide semiconductor layer.