Patent ID: 11967505
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC H  B  C | IPC B  C  H

Claim 0:
1. A semiconductor device comprising:
a gate electrode;
a gate insulating film over the gate electrode;
a first oxide film over the gate insulating film, the first oxide film comprising In, Ga and Zn;
a second oxide film over the first oxide film, the second oxide film comprising In, Ga and Zn; and
a source electrode and a drain electrode over the second oxide film,
wherein the first oxide film comprises a microcrystal,
wherein the second oxide film comprises a c-axis aligned crystal part, and
wherein an atomic ratio of metal elements of the second oxide film satisfies Zn>Ga and Ga>In.