Patent ID: 11955525
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A semiconductor device comprising:
a substrate;
a gate trench in the substrate;
a gate insulating film in the gate trench;
a lower gate electrode film on the gate insulating film, the lower gate electrode film including a top surface, a first side surface, and a second side surface opposite the first side surface;
an upper gate electrode film on the lower gate electrode film, the upper gate electrode film including a first side surface and a second side surface opposite the first side surface; and
a gate capping film on the upper gate electrode film,
wherein a center portion of the top surface of the lower gate electrode film overlaps a center portion of the upper gate electrode film in a direction that is perpendicular to a top surface of the substrate,
each of the first side surface and the second side surface of the lower gate electrode film is connected to the gate insulating film,
each of the first side surface and the second side surface of the upper gate electrode film is connected to the gate insulating film,
a top surface of the upper gate electrode film is concave, and
a bottom surface of the gate capping film is convex.