Patent ID: 7078292

Claim:
A method of forming a storage node contact, the method comprising: preparing a semiconductor substrate that includes at least one storage node contact pad in contact with an active region of a memory cell transistor through an insulation layer; forming a bit line capping layer and a bit line on an upper part of the semiconductor substrate; and forming a storage node contact having a lower region and an upper region, a width of the upper region greater than a width of the lower region, a volume of the upper region greater than a volume of the lower region, the lower region in contact with an upper part of the at least one storage node contact pad, the upper region extending in a gate length direction of the memory cell transistor, the storage node contact configured to electrically connect the at least one storage node contact pad wit a storage node, wherein forming the storage node contact includes forming, on the semiconductor substrate, an interlayer insulation layer having an upper height approximately the same as an upper height of the bit line capping layer and having a flattened upper part, and then forming, vertical to the bit line, a line type mask pattern on an upper part of the bit line capping layer and the interlayer insulation layer, using the line type mask pattern, selectively and isotropically etching a portion of the interlayer insulation layer overlapped with the storage node contact pad to form an opening part extending in a gate direction of the memory cell transistor, forming a spacer at a sidewall of the line type mask pattern and within the opening part, except for a portion overlapped with the storage node contact pad, and then, etching a lower portion of the opening part not having the formation of the spacer by using the spacer and the line type mask pattern, thus forming a storage node contact hole connected from an upper part of the opening part to an upper part of the storage node contact pad, and filling up the storage node contact hole with conductive material to form the storage node contact.