Patent ID: 7776702

Claim:
A method of fabricating a semiconductor apparatus, comprising: forming first and second pillars on a semiconductor substrate; depositing a conductive layer over the first and second pillar and the substrate, the conductive layer enclosing the first and second pillars, the conductive layer having a first portion provided between the first and second pillars, a second portion provided at an upper part of the first and second pillars, and a third portion provided between the first and second portion of the conductive layer; implanting ions into the first portion of the conductive layer and the second portion of the conductive without implanting a significant amount of ions into the third portion, wherein the first and second portions of the conductive layers are converted to another material having a different characteristic than the conductive layer while the third portion of the conductive layer is not converted to another material; and removing the converted first and second portions without removing the third portion using an etch selectivity between the first and second portions and the third portion.