Patent ID: 7855139

Claim:
A method comprising: providing a semiconductor substrate with a plurality of pillars formed thereon; depositing a first layer of dielectric material over a plurality of pillars; removing a portion of the first layer deposited over the plurality of pillars; depositing a second layer of dielectric material over the plurality of pillars, where the second layer leaves a plurality of voids between the plurality of pillars; controlling the deposition of the first layer such that an amount of dielectric material deposited on top of each of the plurality of pillars is greater than an amount of dielectric material deposited on sides of each of the plurality of pillars; controlling the removal of the portion of the first layer such that an amount of dielectric material remains on top of each of the plurality of pillars; and controlling the removal of the portion of the first layer such that an amount of dielectric material is substantially absent from the sides of each of the plurality of pillars.