Patent ID: 8258002

Claim:
A method for manufacturing a phase change memory device, comprising the steps of: preparing a silicon substrate having a plurality of active regions that extend along a first direction and which are arranged at substantially regular intervals along a second direction, wherein the second direction is substantially perpendicular to the first direction; forming a plurality of switching elements in the active regions of the silicon substrate; forming a plurality of heaters on the switching elements; forming a plurality of stack patterns, each stack pattern comprising a phase change layer and a top electrode, wherein each stack pattern has a length that extends along the second direction and over two underlying heaters; forming a plurality of first top electrode contacts on the stack patterns; forming a plurality of wiring patterns, each wiring pattern coming into contact with two underlying first top electrode contacts, each wiring pattern extending along the second direction; forming a plurality of second top electrode contacts on the wiring patterns; forming a plurality of bit lines to be connected with the second top electrode contacts, each bit line extending along the second direction; and forming a plurality of word lines formed over the active regions of the silicon substrate, the word lines being positioned over the bit lines and extending along the first direction so that the word lines are substantially perpendicular to the bit lines.