Patent ID: 7507674

Claim:
A method of manufacturing a memory device, wherein data are stored in a region at which a word line and a bit line cross each other, the method comprising the sequential steps of: (a) providing a data storage layer stacked on a diode layer which is stacked on a conductive material layer which is stacked on a bottom layer; (b) forming a first material layer on the data storage layer; (c) forming a first hole in the first material layer, the hole exposing the data storage layer; (d) forming a first spacer with a second material layer on the sidewall of the first hole; (e) filling the first hole with a third material layer covering the first spacer; (f) removing the first material layer; (g) forming a second spacer with a fourth material layer on the sidewall of the first spacer exposed on removal of the first material layer; (h) removing the third material layer, leaving the first and second spacers exposed; and (i) forming a second hole in a first stack structure including the conductive layer, the diode layer and the data storage layer using the first and second spacers as a mask, the second hole exposing the bottom layer.