Pattern forming method and article manufacturing method
Provided is a method for forming a pattern on a layer on a substrate. The method includes forming a line-and-space pattern on the layer; coating a resist on the line-and-space pattern and filling the resist in a space portion of the line-and-space pattern; exposing a pattern to the resist, developing the exposed resist, and forming a resist pattern on the space portion; and forming a pattern on the layer using a pattern which is a combination of a line portion of the line-and-space pattern and the resist pattern as a mask.
1. A method for forming a pattern in a layer on a substrate, the method comprising:
forming a line-and-space pattern including lines extended in one direction above the layer;
coating a resist on the line-and-space pattern and filling the resist in a space portion of the line-and-space pattern;
exposing a pattern element having a dimension in the one direction smaller than a dimension of the lines in the one direction to the resist;
developing away the exposed resist to form a resist pattern according to the pattern element in the space portion, the resist pattern contacting lines of the line-and-space pattern arranged on both sides of the resist pattern; and
forming a pattern in the layer using a combination of lines of the line-and-space pattern and the resist pattern as a mask.
2. The pattern forming method according to claim 1 , further comprising:
flattening the coated resist after coating the resist on the line-and-space pattern and filling the resist in the space portion of the line-and-space pattern.
3. The pattern forming method according to claim 2 , wherein the coated resist is flattened by performing etching-back treatment.
4. The pattern forming method according to claim 1 , wherein the line-and-space pattern is a pattern in which a plurality of linear lines is arranged side by side.
5. The pattern forming method according to claim 1 , wherein the height of the resist filled in the space portion is equal to or less than the height of the line of the line-and-space pattern.
6. The pattern forming method according to claim 1 , wherein the thickness of the layer in which the pattern is to be formed is set on the basis of a light reflectance of an underlying layer of the layer.
7. A method for manufacturing an article, the method comprising:
forming a pattern on a substrate using the pattern forming method according to claim 1 ; and
processing the substrate, on which the pattern has been formed, to manufacture the article.
8. The pattern forming method according to claim 1 , wherein a dimension of the pattern element in a direction perpendicular to the one direction is equal to or greater than a dimension of the space portion in the direction perpendicular to the one direction.
9. The pattern forming method according to claim 1 , wherein in the exposing step, a plurality of the pattern elements are exposed to the resist and the exposed resist is developed to form the resist pattern of the plurality of the pattern elements in the part of the space portion between the lines.