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

Claim 10:
11. 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 the lower gate electrode film includes titanium nitride (TiN),
the upper gate electrode film includes doped polysilicon,
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,
a top surface of the upper gate electrode film is concave, and
a bottom surface of the gate capping film is convex.