Patent ID: 7387919

Claim:
A method of fabricating a node contact structure, comprising: forming a lower impurity region of a first conductivity type in a predetermined region of a semiconductor substrate; forming a lower insulating layer on the substrate having the lower impurity region; forming a single crystalline semiconductor plug passing through the lower insulating layer to be in contact with the lower impurity region; forming a single crystalline semiconductor body pattern on the lower insulating layer, the single crystalline semiconductor body pattern being formed to contact the single crystalline semiconductor plug; forming an upper impurity region of a second conductivity type in the single crystalline semiconductor body pattern, the upper impurity region being formed on the single crystalline semiconductor plug; forming an upper insulating layer on the substrate having the upper impurity region; etching the upper insulating layer, the upper impurity region and the single crystalline semiconductor plug to form an upper node contact hole that provides a recessed single crystalline semiconductor plug on the lower impurity region; selectively doping the recessed single crystalline semiconductor plug to form a doped semiconductor plug having the first conductivity type; and forming a node metal plug in the upper node contact hole, the node metal plug being in contact with the doped semiconductor plug.