Patent ID: 7709367

Claim:
A method of fabricating a storage node contact in a semiconductor device, the method comprising: forming a landing plug over a substrate; forming a first insulation layer over the landing plug; forming a bit line pattern over the first insulation layer; forming a second insulation layer over the bit line pattern; forming a mask pattern to form the storage node contact over the second insulation layer; etching only the second and first insulation layers until the landing plug is exposed to form a storage node contact hole including a portion having a rounded profile, wherein said etching includes performing a plurality of etching processes, and wherein performing the plurality of etching processes includes performing an etching process that exposes the landing plug which includes performing a first dry etching process and a wet etching process to etch through a first portion of the second insulation layer over the landing plug to a depth which is less than a thickness of the second insulation layer such that a second portion of the second insulation layer remains over the entire landing plug and performing a second dry etching process to etch through the second portion of the second insulation layer and the first insulation layer over the landing plug; filling a conductive material in the storage node contact hole to form a contact plug; and forming a storage node over the contact plug.