Patent ID: 11929426
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for manufacturing a semiconductor device, comprising:
depositing a first oxide semiconductor film;
depositing a first conductive film over the first oxide semiconductor film;
removing part of the first oxide semiconductor film and part of the first conductive film, thereby forming a stacked-layer structure of a first oxide semiconductor and a first conductor;
depositing a first insulating film over the first oxide semiconductor and the first conductor, and then forming a first insulator by planarizing the first insulating film;
forming a second conductor, a third conductor, and an opening exposing part of the first oxide semiconductor by removing part of the first insulator and part of the first conductor;
depositing a second oxide semiconductor film in contact with an exposed region of the first oxide semiconductor;
depositing a second insulating film over the second oxide semiconductor film;
performing microwave-excited plasma treatment on the second insulating film with a pressure of higher than or equal to 400 Pa;
depositing a second conductive film over the second insulating film; and
removing part of the second conductive film, part of the second insulating film, and part of the second oxide semiconductor film, thereby exposing the first insulator and forming a second conductor, a second insulator, and a second oxide semiconductor that are embedded in the opening.