Patent ID: 7771905
Filing Date: 2010-08-10
Classification: G03F

Abstract:
1. A method for calculating an offset of an exposure dose and an offset of a focus position in an exposure apparatus that exposes a substrate via an original, said method comprising: a first step of preliminarily calculating a first library that represents a relation between the exposure dose and a critical dimension, a second library that represents a relation between the critical dimension and the focus position, and a third library that represents a relation between the focus position and information of a shape of a pattern; a second step of obtaining information of a shape of a pattern formed on the substrate using the exposure apparatus; a third step of calculating a first shift amount between a critical dimension contained in the information of the shape of the pattern and a reference value of the critical dimension; a fourth step of calculating, by using the first library, an offset of a first exposure dose to correct the first shift amount of the critical dimension, which is calculated in the third step; a fifth step of calculating the offset of the focus position based on the information of the shape of the pattern by using the third library; a sixth step of calculating, by using the second library, a second shift amount of a critical dimension that occurs when the focus position, with a predetermined exposure amount, is shifted by the offset of the focus position, which is calculated in the fifth step, and calculating, by using the first library, a second exposure dose to correct the second shift amount; and a seventh step of calculating the offset of the exposure dose by adding the offset of the first exposure dose to the offset of the second exposure dose.