Patent ID: 8030215

Claim:
A method comprising: forming a sacrificial layer on a substrate; forming a mask layer on the sacrificial layer; patterning the mask layer to form a plurality of mask lines and to reveal first portions of the sacrificial layer; patterning the plurality of mask lines to (i) form a plurality of mask islands by removing portions of the plurality of mask lines and (ii) reveal second portions of the sacrificial layer, the second portions being revealed by removing the portions of the plurality of mask lines; removing the revealed first and second portions of the sacrificial layer to form a plurality of pillars of the sacrificial layer, wherein ones of the plurality of pillars are disposed between corresponding ones of the plurality of mask islands and the substrate; forming a dielectric layer on the sacrificial layer around the plurality of pillars; removing the plurality of mask islands and the plurality of pillars to form a corresponding plurality of holes in the dielectric layer; forming an electrode to fill a portion of at least one hole of the plurality of holes in the dielectric layer; and depositing a phase change material to substantially fill a remaining portion of the at least one hole that is not filled by the electrode.