Patent ID: 9484297
Filing Date: 2016-11-01
CPC Classification: H01L

Claim Text:
1. A method comprising: forming an inductor trench in a first dielectric layer; forming a first metal-oxide hard mask by disposing a metal hard mask and an oxide hard mask over the first dielectric layer and in strips in the inductor trench; forming first metal line trenches through the first metal-oxide hard mask and into the first dielectric layer on opposite sides of the inductor trench and first vias through both the first metal-oxide hard mask and the first dielectric layer; filling the first metal line trenches, first vias, and inductor trench and removing the first metal-oxide hard mask from the first dielectric layer; forming a second dielectric layer and a second metal-oxide hard mask over the filled inductor trench, first vias and first metal line trenches and the first dielectric layer; forming a second trench through the second metal-oxide hard mask and into the second dielectric layer and second metal line trenches and second vias through both the second metal-oxide hard mask and the second dielectric layer down to the first metal line trenches and first vias, respectively; and filling the second metal line trenches, second vias, and second trench.