Patent ID: 11972945
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 steps of:
forming an oxide semiconductor layer over a substrate;
forming a first insulating layer over the oxide semiconductor layer;
forming a first gate electrode over the first insulating layer;
supplying an impurity element to the oxide semiconductor layer through the first insulating layer using the first gate electrode as a mask;
performing first treatment on the first gate electrode; and
forming a second insulating layer over the first gate electrode,
wherein the impurity element contains hydrogen, and
wherein the first treatment is plasma treatment in an atmosphere including a mixed gas of a first gas containing an oxygen element but not containing a hydrogen element and a second gas containing a hydrogen element but not containing an oxygen element.