Patent ID: 7419767

Claim:
A method of forming a pattern, comprising: (a) providing as a first mask a phase-shifting mask comprising: a transparent substrate; a first pattern region formed on the substrate; the first pattern region including a first blocking part for forming at least one first pattern element; a second pattern region formed on the substrate; the second pattern region including second blocking parts for forming second pattern elements arranged periodically; in the first pattern region, a first phase-shifting part formed at one side of the first blocking part and a first transparent part formed at an opposite side of the first blocking part to the first phase-shifting part; in the second pattern region, a second phase-shifting part formed at one side of each of the second blocking parts and a second transparent part formed at an opposite side of the second blocking part to the second phase-shifting part; a width of the first-phase shifting part in the first pattern region having a relationship with a width of the second-phase shifting part in the second pattern region in such a way that an intensity of exposing light penetrated through the first pattern region is approximately equal to an intensity of the exposing light penetrated through the second pattern region; a third blocking part formed on the substrate to surround the first phase-shifting part and the first transparent part in the first pattern region; and a fourth blocking part formed on the substrate to surround the second phase-shifting part and the second transparent part in the second pattern region; (b) providing a non-phase-shifting second mask; the second mask including a transparent substrate, a fifth blocking part that covers entirely the first blocking part of the first mask, a sixth blocking part that covers entirely the second blocking part of the first mask, and a third transparent part for exposing the third and fourth blocking parts of the first mask; c) selectively irradiating exposing light to a photoresist film formed on an pattern-formation object using the first mask; (d) selectively irradiating the exposing light to the photoresist film using the second mask after (c); and (e) developing the photoresist film after (d), wherein the first phase-shifting part of the first pattern region has a width 0.9 to 1.4 times as large as a width of the second phase-shifting part of the second pattern region, and the at least one first pattern element is an isolated pattern element.