Patent ID: 11961918
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A method for manufacturing a semiconductor device, comprising:
a first step of forming a first insulating layer containing silicon and nitrogen;
a second step of performing plasma treatment using a microwave in an atmosphere containing oxygen in a vicinity of a surface of the first insulating layer;
a third step of forming a semiconductor layer containing a metal oxide over and in contact with the first insulating layer;
a fourth step of forming a second insulating layer containing oxygen over and in contact with the semiconductor layer;
a fifth step of performing plasma treatment in an atmosphere containing oxygen at a first temperature;
a sixth step of performing plasma treatment in an atmosphere containing oxygen at a second temperature; and
a seventh step of forming a third insulating layer containing silicon and nitrogen over the second insulating layer.