Patent ID: 8236664
Filing Date: 2012-08-07
Classification: G11C,H01L

Abstract:
1. A method for manufacturing a phase change memory device, comprising the steps of: providing a silicon substrate having a plurality of active regions formed thereon, wherein the plurality of active regions extend in a first direction and are arranged at regular intervals in a second direction perpendicular to the first direction; forming a first interlayer dielectric on the silicon substrate; etching the first interlayer dielectric to define contact holes; forming switching elements in the contact holes; forming a second interlayer dielectric on the first interlayer dielectric including the switching elements; etching the second interlayer dielectric to define holes to expose side portions of the switching elements which face each other in a diagonal direction with respect to the first direction and to expose portions of the first interlayer dielectric between the exposed side portions of the switching elements; forming sequentially a phase change material and an upper electrode material on the second interlayer dielectric and the holes defined therein; and etching the upper electrode material and the phase change material to form line-shaped phase change patterns and upper electrodes to be connected with the switching elements arranged in the second direction and including surfaces of the holes.