Patent ID: 7602038
Filing Date: 2009-10-13
Classification: H01L

Abstract:
1. A semiconductor device, comprising: an etch barrier layer; a dielectric layer over the etch barrier layer; a conductive metal interconnect formed in a first region of the semiconductor device and through the dielectric layer and etch barrier layer; a metal barrier layer formed in a second region of the semiconductor device different from the first region and over the etch barrier layer; an air gap formed in the second region and extending through the dielectric layer and to a lower photosensitive passivation material, the air gap including a top portion, a bottom portion, a first side portion, and a second side portion; an upper photosensitive passivation material formed at least over the top portion of the air gap; and wherein the lower photosensitive passivation material is formed at the bottom portion of the air gap on the metal barrier layer, wherein the first side portion and the second side portion are perpendicular to the top portion and the bottom portion, wherein the metal barrier layer is formed below the bottom portion of the air gap, the bottom portion being opposite to the top portion and defining a bottom plane, and wherein the air gap is not disposed below the bottom plane.