Patent ID: 11881522
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A manufacturing method of a semiconductor device comprising a first conductor, a first insulator to a third insulator, a first oxide, and a second oxide, comprising:
forming the first oxide over a substrate;
forming the first insulator over the first oxide;
forming an opening reaching the first oxide in the first insulator;
depositing a first oxide film in contact with the first oxide and the first insulator in the opening;
depositing a first insulating film over the first oxide film;
depositing a first conductive film over the first insulating film;
removing part of the first oxide film, part of the first insulating film, and part of the first conductive film until a top surface of the first insulator is exposed to form the second oxide, the second insulator, and the first conductor;
forming the third insulator over the first conductor;
performing microwave treatment from above the third insulator; and
performing heat treatment on one or both of the first insulator and the first oxide,
wherein the microwave treatment is performed using a gas containing oxygen under reduced pressure, and
wherein the heat treatment is performed under reduced pressure.