Patent ID: 11963469
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 18:
19. A method comprising:
forming a bottom metal line located on top of a substrate;
forming a dielectric layer located above a bottom metal line;
forming a resistive liner located directly on top of the dielectric layer;
forming a phase change material layer located above the dielectric layer;
forming a barrier layer located on top of the phase change material layer, wherein the phase change material is sandwiched between the resistive liner and the barrier layer;
forming a first trench and a second trench, wherein the first trench extends downwards to bottom metal line and the second trench extends downwards to the dielectric layer;
forming a first electrode in the first trench and forming a second electrode in the second trench; and
forming an airgap is located directly above the barrier layer and in between the first electrode and the second electrode, wherein the airgap provides space for the phase change material to expand or restrict, wherein the phase change material is located completely beneath the air gap.