Patent ID: 9230911
Filing Date: 2016-01-05
CPC Classification: H01L

Claim Text:
1. An interconnect structure, comprising: a first low-k (LK) dielectric layer; a second LK dielectric layer over the first LK dielectric layer; a first conductive feature and a second conductive feature in the second LK dielectric layer; a first spacer along a first sidewall of the first conductive feature; a second spacer along a second sidewall of the second conductive feature, wherein the second sidewall of the second conductive feature faces the first sidewall of the first conductive feature; an air gap between the first spacer and the second spacer, wherein the second LK dielectric layer extends at least in part between the first spacer and the air gap, between the second spacer and the air gap, or both; and a third conductive feature over the first conductive feature, wherein the third conductive feature is connected to the first conductive feature.