Patent ID: 7571424
Filing Date: 2009-08-04
Classification: G03F

Abstract:
1. A computer-implemented lithography method comprising: a simulation method for mathematically approximating a photoresist film pattern with a diffused aerial image model (“DAIM”), wherein at least two acids having heterogeneous diffusion characteristics are applied to the DAIM, wherein at least two kinds of photo acid generator having heterogeneous diffusion characteristics are modeled to improve a simulation accuracy; and fabricating a semiconductor device using the photoresist film pattern, wherein a separated polymer of the DAIM has a concentration M (x, y, t where σ 1 and σ 2 are diffusion coefficients, f is a concentration fraction (0<f<1), (x, y) are plane coordinates where a photoresist exists, (ζ, η) are spatial frequency conjugation coordinates with respect to (x, y) in Fourier transformation, t B is a time of a post exposure baking process, and A 0 is a concentration of standard acid after exposure.