Patent ID: 8304180
Filing Date: 2012-11-06
Classification: G03F

Abstract:
1. A device manufacturing method utilizing a complementary phase shift mask (c:PSM) imaging technique, the method comprising: projecting a first patterned beam of radiation onto a target portion of a substrate, said first patterned beam being formed using an alternating phase shift mask exposed to a first beam of radiation; projecting a second patterned beam of radiation onto the target portion of the substrate, said second patterned beam being formed using a trim mask exposed to a second beam of radiation, wherein the trim mask includes a protective shadow region to protect features formed on the target portion of the substrate using the first patterned beam of radiation; wherein the exposure dose of the second beam is selected in accordance with a width of the protective shadow region or the width of the protective shadow region is selected in accordance with the exposure dose of the second beam, so as to achieve a particular critical dimension correction for a particular pitch at a reduced trim sensitivity relative to that for an exposure using the trim mask using the particular pitch without the selected exposure dose or selected width.