Patent ID: 8993398
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A method comprising: forming a substrate such that a plurality of access devices are embedded within the substrate; forming a sacrificial layer on the substrate; forming a mask layer on the sacrificial layer; patterning the mask layer to (i) form a plurality of mask islands by removing portions of the mask layer and (ii) reveal portions of the sacrificial layer, wherein the plurality of mask islands are formed on a corresponding plurality of sections of the sacrificial layer, and wherein the plurality of sections of the sacrificial layer are formed on a corresponding access device of the plurality of access devices that are embedded within the substrate; removing the revealed 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, wherein each pillar of the plurality of pillars is formed over the corresponding access device of the plurality of access devices that are embedded within the substrate; forming a dielectric layer around the plurality of pillars; and removing the plurality of mask islands and the plurality of pillars to form a corresponding plurality of holes in the dielectric layer, thereby providing (i) the dielectric layer and (ii) the plurality of holes in the dielectric layer, wherein the plurality of holes in the dielectric layer are formed on the corresponding access device of the plurality of access devices that are embedded within the substrate.