Patent ID: 8273598

Claim:
A method of forming a device comprising: forming a pedestal of a sacrificial material on a portion of a lower electrode; forming at least one dielectric material adjacent to the sacrificial material, wherein the forming of the at least one dielectric material adjacent to the pedestal of the sacrificial material comprises forming a conformal layer on the pedestal of the sacrificial material, forming an interlevel dielectric layer on the conformal layer, and planarizing to remove a portion of the interlevel dielectric layer and the conformal dielectric layer overlying the pedestal of the sacrificial material, the at least one dielectric material having an upper surface substantially coplanar with an upper surface of the pedestal of the sacrificial material; removing the pedestal of the sacrificial material selective to the at least one dielectric material and the lower electrode to provide an opening to an exposed surface of the lower electrode; depositing a phase change material on the exposed surface of the lower electrode; and filling the opening with a conductive fill material.