Patent ID: 8404582
Filing Date: 2013-03-26
Classification: H01L

Abstract:
1. A method of forming a device, comprising: providing a substrate; forming a first ILD layer above the substrate, wherein the first ILD layer has a top surface and a first opening; depositing a first metal liner in the first opening; forming a first metallization level in the first opening; forming a first cap layer on the top surface of the first ILD layer; forming a second ILD layer above the first cap layer, wherein the second ILD layer has a top surface and a second opening extending into the first metallization level; depositing a second metal liner on the top surface and in the second opening; forming a second metallization level in the second opening; performing a CMP of the second metallization level, wherein a top of the second metallization level is co-planar with a top of the second metal liner; forming a second cap layer on the second metallization level, wherein the forming of said second cap layer on the second metallization level comprises selectively depositing a dielectric cap selected from the group consisting of: silicon carbon nitride (SiCN), silicon nitride (SiN) and silicon carbide (SiC); forming a recess in the second metallization level below a top surface of the second ILD layer before the forming said second cap layer on the second metallization level; and removing the second metal liner from the top surface of the second ILD layer.