Patent ID: 9293602
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: an oxide semiconductor stack; a first gate electrode layer comprising a region overlapping with the oxide semiconductor stack; a first gate insulating layer between the oxide semiconductor stack and the first gate electrode layer; a first electrode layer and a second electrode layer electrically connected to the oxide semiconductor stack; a second gate electrode layer comprising a region overlapping with the oxide semiconductor stack; and a second gate insulating layer between the oxide semiconductor stack and the second gate electrode layer; the oxide semiconductor stack being between the first gate insulating layer and the second gate insulating layer, wherein the oxide semiconductor stack includes at least a first oxide semiconductor layer, a second oxide semiconductor layer comprising a crystalline structure over the first oxide semiconductor layer, and a third oxide semiconductor layer over the second oxide semiconductor layer, wherein the first oxide semiconductor layer and the third oxide semiconductor layer each include a layer expressed as InM wherein the second oxide semiconductor layer includes an indium zinc oxide layer.