Patent ID: 8422283
Filing Date: 2013-04-16
Classification: H01L

Abstract:
1. A method for manufacturing a phase change memory device, comprising the steps of: forming an interlayer dielectric on a semiconductor substrate; etching the interlayer dielectric to form contact holes in a plurality of phase change cell regions of the semiconductor substrate; forming lower electrodes respectively in the plurality of phase change cell regions of the semiconductor substrate; forming a first insulation layer on the interlayer dielectric including the lower electrodes to have holes which expose the respective lower electrodes; forming a material layer for heaters on the first insulation layer including the holes; forming a second insulation layer on the material layer for heaters to fill the holes in which the material layer for heaters is formed; polishing chemically and mechanically the second insulation layer and the material layer for heaters to expose the first insulation layer, and thereby forming heaters on surfaces of the holes to be brought into contact with the lower electrodes; forming a mask pattern on the first and second insulation layers including the heaters to have openings which expose portions of the respective heaters and which have a constant pitch, wherein the openings are arranged to expose the heaters in a direction perpendicular to the cell arrangement direction; forming a phase change layer on the mask pattern including the exposed portions of the heaters and the first and second insulation layers; and forming upper electrodes on the phase change layer.