Patent ID: 11917812
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A semiconductor device comprising:
an active pattern on a substrate;
a gate structure having a lower part in direct contact with an upper portion of the active pattern, the gate structure extending in a first direction parallel to an upper surface of the substrate and including,
a first conductive pattern,
a second conductive pattern on the first conductive pattern, and
a gate mask on the second conductive pattern;

a bit line structure contacting a middle portion of the active pattern and extending in a second direction parallel to the upper surface of the substrate and perpendicular to the first direction;
a first contact plug structure contacting each of opposing end portions of the active pattern;
a capacitor on the first contact plug structure; and
a second contact plug contacting an end portion in the first direction of the gate structure, the second contact plug including,
a first extension portion extending in a vertical direction perpendicular to the upper surface of the substrate and contacting sidewalls of the gate mask and of the second conductive pattern,
a second extension portion under the first extension portion and contacting the first extension portion, the second extension portion contacting a sidewall of the first conductive pattern, and
a protrusion portion under the second extension portion and contacting the second extension portion, a bottom of the protrusion portion not contacting the first conductive pattern,

wherein a first angle of a sidewall of the first extension portion with respect to the upper surface of the substrate is greater than a second angle of a sidewall of the second extension portion with respect to the upper surface of the substrate.