Patent ID: 7556891
Filing Date: 2009-07-07
Classification: G03F

Abstract:
1. A method for forming a contact hole unit cell, comprising: positioning a contact hole region of a first phase at a first plane, the contact hole region being transparent to light; positioning a phase-shifting region of a second phase at the first plane, the second phase being substantially out of phase with the first phase, and the phase-shifting region substantially surrounding the contact hole region and being transparent to light; positioning a border region at the first plane outside the phase-shifting region, the border region having a phase substantially the same as that of the contact hole region and being transparent to light; positioning a chrome pad at the first plane outside and contacting at least a portion of the border region; and positioning the contact hole region, the phase-shifting region, the border region, and the chrome pad to cause light from the first plane to be reinforcing in a target contact hole configuration on a second plane and to be substantially neutralizing outside the target contact hole configuration on the second plane.