Patent ID: 11869980
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A semiconductor device comprising:
a gate electrode;
an oxide semiconductor film; and
a gate insulating film between the gate electrode and the oxide semiconductor film,
wherein the oxide semiconductor film comprises a first region, a second region, and a third region,
wherein the first region comprises indium, an element M, and zinc,
wherein the element M is one or more of aluminum, gallium, yttrium, and tin,
wherein each of the second region and the third region comprises indium and zinc,
wherein a concentration of indium in the second region is higher than a concentration of indium in the first region,
wherein a concentration of indium in the third region is higher than the concentration of indium in the first region, and
wherein at least a part of the first region is between the second region and the third region.