Patent ID: 9293544
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor layer; a first electrode over and in contact with the semiconductor layer, the first electrode having a closed shape and a first opening; a second electrode over and in contact with the semiconductor layer, the second electrode being positioned in the first opening; an insulating layer over the semiconductor layer, the first electrode, and the second electrode; a third electrode over and in contact with the insulating layer, the third electrode having a closed shape and a second opening; and a wiring passing the second opening and electrically connected to the second electrode, wherein the semiconductor layer comprises an oxide semiconductor, wherein the semiconductor layer comprises a first layer and a third layer, with a second layer therebetween, and wherein the first layer, the second layer, and the third layer satisfy the following relationship: where EcS1, EcS2, and EcS3 are energies of bottoms of conduction bands of the first layer, the second layer, and the third layer, respectively.