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

Claim 16:
17. A semiconductor device comprising:
a first conductive layer;
a first insulating layer;
a semiconductor layer;
a second insulating layer; and
wherein the first conductive layer, the first insulating layer, the semiconductor layer, and the second insulating layer are stacked in this order,
wherein the first insulating layer contains silicon and nitrogen,
wherein the semiconductor layer contains a metal oxide,
wherein the second insulating layer contains oxygen,
wherein the first insulating layer comprises a first region including a surface in contact with the semiconductor layer and a second region other than the first region,
wherein the first region has a higher concentration of oxygen than the second region,
wherein the first region has a lower concentration of hydrogen than the second region,
wherein a first metal oxide film and a second metal oxide film are stacked in the semiconductor layer,
wherein the first metal oxide film comprises a portion in contact with the first region of the first insulating layer,
wherein the second metal oxide film comprises a portion in contact with the second insulating layer, and
wherein the first metal oxide film has lower crystallinity than the second metal oxide film.