Patent ID: 6670082
Filing Date: 2003-12-30
Classification: G03F

Abstract:
A method of building a library used for correcting intensity imbalance in an alternating phase-shifting mask, the method comprising:determining a first group of 180 degree phase-shifting regions for the alternating phase-shifting mask, the first group of 180 degree phase-shifting regions having a common first size; performing a three dimensional (3D) simulation based on the first size; performing a two dimensional (2D) simulation based on the first size; altering a transmission and a phase in the 2D simulation until a shape dependent transmission and a shape dependent phase allow the 2D simulation to substantially match the 3D simulation; associating the first size with the shape dependent transmission and the shape dependent phase in the library; choosing a modified first size of a 180 degree phase-shifting region using the shape dependent transmission and the shape dependent phase such that a 2D simulation based on the modified first size substantially matches the 3D simulation based on the first size; associating the modified first size with the first size in the library; and optionally, performing an optical proximity correction of the phase-shifting mask using phase shifters replaced according to the library such that the optical proximity correction is performed on phase shifters corrected for intensity imbalance.