Patent ID: 9741669
Date: 2017-08-22
CPC Classifications: H01L

Claim:
1. A method comprising: performing a first light-exposure on a photo resist using a first lithography mask, wherein the first lithography mask covers a first portion of the photo resist, and the first portion of the photo resist comprises a first strip portion exposed in the first light-exposure; performing a second light-exposure on the photo resist using a second lithography mask, wherein the second lithography mask covers a second portion of the photo resist, and the second portion of the photo resist comprises a second strip portion exposed in the second light-exposure, and wherein the first strip portion and the second strip portion have an overlapping portion that is double exposed; developing the photo resist to remove the first strip portion and the second strip portion; etching a dielectric layer underlying the photo resist to form a trench; and filling the trench with a conductive feature.