Patent ID: 11917815
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A manufacturing method of a semiconductor device, the method comprising:
defining an active region by forming a device isolation layer in a substrate by using a first mask;
forming a trench in the substrate crossing the active region and extending in a first direction, and by filling a bottom portion of the trench with a conductive layer, forming a buried word line;
forming a second mask filling a top portion of the trench on the word line;
by using the first mask and the second mask, recessing the device isolation layer such that side surfaces of a top portion of the active region are exposed;
forming a mask pattern exposing the first mask of a portion corresponding to the center of the active region, and by using the mask pattern, forming a contact hole by removing the exposed first mask and a top portion of the active region under the first mask;
forming a gap fill insulating layer on an entire surface of the substrate, and by removing a portion of the gap fill insulating layer, forming a buffer insulating layer filling a space between two first masks adjacent to each other in the first direction;
forming a contact by filling the contact hole with a conductive layer; and
forming a bit line extending in a second direction perpendicular to the first direction on the word line, the bit line being connected to the contact,
wherein the semiconductor device comprises a cell region in which the active region extends in an oblique direction with respect to the first direction and a core region around the cell region, and
wherein the contact is self-aligned to the active region by the first mask and the second mask.