Patent ID: 8492241

Claim:
A method of forming a device, comprising: providing a substrate; depositing a pad film on top of the substrate; simultaneously forming a first trench and a second trench in the substrate, wherein the first trench is wider and deeper than the second trench; depositing a node dielectric layer on the pad film and on a bottom and sidewalls of both the first trench and the second trench; depositing a first material over the node dielectric layer to completely fill the second trench and partially fill the first trench; removing all of the first material from the first trench and some of the first material from the second trench; depositing a liner only on sidewalls of the first trench; depositing a conductive material to fill the first trench; planarizing the conductive material; thinning the substrate to the node dielectric layer at the bottom of the first trench; and removing the node dielectric layer from the bottom of the first trench, wherein a bottom surface of the substrate is substantially coplanar with a bottom surface of the conductive material.