Patent ID: 8906763

Claim:
A method of manufacturing a dynamic random access memory (DRAM) device, comprising: forming a mask pattern of a first insulating material on a substrate including an active region having an island shape; forming a buried gate pattern extending in a first direction, the buried gate pattern being within the substrate and between portions of the mask pattern; forming a capping insulating layer of a second insulating material different from the first insulating material on the buried gate pattern and the portions of the mask pattern, the capping insulating layer filling up a gap between the portions of the mask pattern; forming an opening portion penetrating the capping insulating layer and the mask pattern to expose a first portion of the active region; etching a side portion of the mask pattern at both sides in the first direction in the opening portion to form a first groove and a second groove exposing a second portion of the active region adjacent to the opening portion; forming second pad contacts in the first and second grooves, the second pad contacts contacting the second portion of the active region; forming a spacer on a sidewall of the opening portion and on an exposed sidewall of the second pad contacts; forming a first pad contact in the opening portion including the spacer, the first pad contact contacting the first portion of the active region; and forming a bit line configured to electrically connect with the first pad contact; and forming a capacitor configured to electrically connect with the second pad contacts.