Patent ID: 11929416
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor device comprising:
a first oxide;
a second oxide over the first oxide;
a first insulator over the second oxide;
a first conductor over the first insulator; and
a second conductor and a third conductor over the second oxide,
wherein the second conductor comprises a first region and a second region,
wherein the third conductor comprises a third region and a fourth region,
wherein the second region is positioned above the first region,
wherein the fourth region is positioned above the third region,
wherein each of the second conductor and the third conductor comprises tantalum and nitrogen,
wherein an atomic ratio of nitrogen to tantalum in the first region is higher than an atomic ratio of nitrogen to tantalum in the second region,
wherein an atomic ratio of nitrogen to tantalum in the third region is higher than an atomic ratio of nitrogen to tantalum in the fourth region,
wherein the second conductor further comprises a fifth region,
wherein the third conductor further comprises a sixth region,
wherein the fifth region is positioned above the second region,
wherein the sixth region is positioned above the fourth region,
wherein an atomic ratio of nitrogen to tantalum in the fifth region is higher than the atomic ratio of nitrogen to tantalum in the second region, and
wherein an atomic ratio of nitrogen to tantalum in the sixth region is higher than the atomic ratio of nitrogen to tantalum in the fourth region.