Patent ID: 11943929
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A semiconductor device comprising:
a first conductor over a substrate;
a first insulator over the first conductor;
a second conductor over the first insulator; and
a third conductor, a second insulator, and an oxide which are embedded in a first opening in the first insulator and a second opening in the second conductor,
wherein the oxide comprises indium and zinc,
wherein the third conductor, the second insulator, and the oxide extend in a direction intersecting a top surface of the substrate,
wherein the oxide surrounds the third conductor with the second insulator provided therebetween,
wherein a bottom surface of the oxide is in contact with a top surface of the first conductor,
wherein the oxide comprises a first region in the first opening and a second region in the second opening, and
wherein the resistance of the first region is lower than the resistance of the second region.