Patent ID: 11869979
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A semiconductor device comprising a transistor, the transistor comprising:
a first insulator;
a second insulator over the first insulator;
a first oxide over the second insulator;
a second oxide over the first oxide;
a third oxide over the second oxide;
a third insulator over the third oxide; and
a conductor over the third insulator;
wherein the second oxide comprises a first region, a second region, and a third region positioned between the first region and the second region,
wherein resistance of the first region and resistance of the second region are lower than resistance of the third region,
wherein the conductor is provided above the third region to overlap with the third region,
wherein in a channel width direction of the transistor, with reference to a height of a bottom surface of the first insulator, a height of a bottom surface of the conductor in a region where the conductor and the second oxide do not overlap with each other is lower than a height of a bottom surface of the second oxide, and
wherein in the channel width direction of the transistor, at least part of the third oxide in a region where the third oxide and the second oxide do not overlap with each other is in contact with the first insulator.