Patent ID: 7057288
Filing Date: 2006-06-06
Classification: H01L

Abstract:
1. An electric device comprising: a layer having a plurality of first wirings and a plurality of second wirings; a first low-dielectric-constant film formed in a space between at least one adjacent pair of the first wirings; and a second low-dielectric-constant film formed in a space between at least one adjacent pair of the second wirings, wherein the top surface of the second low-dielectric-constant film is substantially at the same level as the top surface of the second wirings, the space between the adjacent pair of the first wirings is narrower than the space between the adjacent pair of the second wirings, the second low-dielectric-constant film has a mechanical strength higher than that of the first low-dielectric-constant film, and the first low-dielectric-constant film is formed in the space between the adjacent pair of the second wirings.