Patent ID: 11908733
Assignee: ASM IP HOLDING B.V.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor device comprising:
a substrate;
at least one memory cell string extending to protrude on the substrate;
a first word line connected to a first memory cell among the at least one memory cell string; and
a second word line connected to a second memory cell among the at least one memory cell string,
wherein at least one of the first word line and the second word line comprises:
a word line conductive layer extending toward a channel;
a first conductive layer on the word line conductive layer; and
a second conductive layer on the first conductive layer,
wherein the first conductive layer comprises a surface region and an inner region under the surface region,
the first conductive layer comprises an upper recess in the surface region and a lower recess in the inner region, and
an extension length of the upper recess is different from an extension length of the lower recess.