Patent ID: 6984477
Filing Date: 2006-01-10
Classification: G03F,H01L

Abstract:
1. A resist pattern forming method, comprising the steps of: (a) forming a resist film on a surface of a substrate with a base film and a base pattern, the resist film being formed on the surface of the substrate by holding the substrate horizontally with a substrate holder and supplying a resist solution from a nozzle thereto and rotating the substrate holder to spread the resist solution by a centrifugal force; (b) exposing the substrate coated with the resist solution while being disposed at a focus point of a lens in an exposing portion having a light source and the lens, by radiating a ray of a predetermined intensity for a predetermined time period, using a predetermined pattern mask; (c) developing the exposed resist on the surface of the substrate by supplying a developing solution of a predetermined temperature on the exposed resist and leaving the supplied developing solution for a predetermined time period; (d) measuring data of at least one measurement item selected from: a reflection ratio and a film thickness of the base film, a film thickness of the resist film, a line width after the developing, and a defect on the surface after the developing; and (e) amending a set value based on measured data selected from at least one of the parameters subject to the amendment, according to a contribution degree of each of the parameters: a rotating speed, a degree of acceleration and a position of the nozzle when coating the resist solution, a time period for the developing and a temperature of the developing solution when developing the substrate, an intensity of the ray radiated from the exposing portion to the substrate, a time period for the exposure, an alignment of the exposing portion and the substrate, and a distance between the focus point of the exposing portion and the substrate, the contribution degree (μ) being obtained by an analysis of an unit amount and for a degree of an effect given to the reflection ratio and the film thickness of the base film, the film thickness of the resist film, the line width after the developing, the accuracy that the base pattern matches with the resist pattern, and the defect on the surface after the developing, when the set value of each of the parameters is subjected to amendment of: the rotating speed, the degree of acceleration and the position of the nozzle when coating the resist solution, the time period for the developing and the temperature of the developing solution when developing the substrate, the intensity of the ray radiated from the exposing portion to the substrate, the time period for the exposure, an alignment of the exposing portion and the substrate, and the distance between the focus point of the exposing portion and the substrate, and the contribution degree is represented by coefficients μ where α is a constant; wherein the step (e) amends the set value of the parameters subject to amendment with a priority such that the parameter with higher contribution degree is amended prior to the parameter with lower contribution degree.