Patent ID: 11972977
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of forming interconnects, comprising:
forming a plurality of mandrels on an interlayer dielectric (ILD) layer;
forming sidewall spacers on opposite sides of the each mandrel, wherein a portion of the ILD layer is exposed between adjacent sidewall spacers on adjacent mandrels;
removing the exposed portions of the ILD layer to form a first set of trenches between adjacent sidewall spacers;
forming a first set of interconnects in the first set of trenches;
removing the mandrels to expose portions of the ILD layer between the sidewall spacers;
removing the exposed portions of the ILD layer to form a second set of trenches between the sidewall spacers;
forming a second set of interconnects in the second set of trenches, wherein the sidewall spacers and the ILD layer are each made of a material different from the mandrels; and
forming a post metal cap on each of the first set of interconnects and the second set of interconnects.