Patent ID: 6544721
Filing Date: 2003-04-08
Classification: G03F

Abstract:
An exposure method comprising;a first exposure step of exposing a resist through a first phase shift mask having a light-blocking part and a non-light-blocking part; and a second exposure step of exposing the resist through a second phase shift mask having a light-blocking part and a non-light-blocking part, wherein each of the non-light-blocking part of the first phase shift mask and the non-light-blocking part of the second phase shift mask has a shape and an orientation substantially the same as a pattern to be exposed, the first exposure step and the second exposure step are performed in order, in reverse order or simultaneously, and when the first and second steps are performed in order or in reverse order, the resist is not developed between the first and second steps, and the first phase shift mask is arranged such that predetermined areas, which are adjacent to each other at least in a first direction across the light-blocking part of the first phase shift mask, give a phase shift of substantially an odd-number of times as much as &pgr; between light portions propagating through the respective predetermined areas while the second phase shift mask is arranged such that predetermined areas adjacent to each other at least in a second direction different from the first direction across the light-blocking part of the second phase shift mask, give a phase shift of substantially an odd-number of times as much as &pgr; between light portions propagating through the respective predetermined areas.