Pattern formation method
View Patent ↗A pattern formation method comprises a process of forming a resist pattern with an opening that exposes a first region of a glass film arranged on a substrate through a base film; a process of forming a neutralization film above the glass film; a process of forming a directed self-assembly material layer containing a first segment and a second segment above the glass film; a process of microphase separating the directed self-assembly material layer to form a directed self-assembly pattern containing a first part that includes the first segment and a second part that includes the second segment; and a process of removing either the first part or the second part and using the other as a mask to process the base film.
1. A pattern formation method, comprising:
forming a first layer on a substrate;
forming a second layer on the first layer;
forming a resist pattern on the second layer in a line and space pattern, the space pattern having openings that expose a portion of the second layer;
removing the resist pattern to form a first region and a second region on the second layer, wherein the first region has a greater hydrophobicity than the second region;
forming a neutralization film on the second layer;
removing the neutralization film;
forming a directed self-assembly material layer containing a first segment and a second segment on the second layer after the neutralization film is removed;
microphase separating the directed self-assembly material layer to form a self-assembled pattern containing a first polymer part that includes the first segment and a second polymer part that includes the second segment; and
removing either the first polymer part or the second polymer part, using the other as a mask to process the first layer.
2. The method of claim 1 , wherein removing the resist pattern comprises oxidizing the resist pattern.
3. The method of claim 2 , wherein removing the resist pattern comprises exposing the resist pattern and the second layer to oxygen plasma.
4. The method of claim 2 , wherein removing the resist pattern comprises exposing the resist pattern to ozonated water.
5. The method of claim 2 , wherein removing the resist pattern comprises exposing the resist pattern to light in the vacuum-ultraviolet wavelength.
6. The method of claim 1 , wherein removing the resist pattern comprises exposing the resist pattern to a solvent.
7. The method of claim 1 , wherein the neutralization film alters the hydrophobicity of the first region.
8. The method of claim 7 , wherein the neutralization film alters the hydrophobicity of the second region.
9. The method of claim 8 , wherein the neutralization film increases the hydrophobicity of the second region.
10. A pattern formation method, comprising:
forming a first film on a substrate;
forming a second film on the first film;
forming resist pattern on the second film, the resist pattern having a line-and-space pattern, wherein a line width is narrower than a space width;
removing the resist pattern to form a first region and a second region on the second film, each of the first region and the second region having different hydrophobic properties;
forming a neutralization film on the second layer;
removing the neutralization film;
forming a directed self-assembly material layer containing a first segment and a second segment on the line and space pattern after the neutralization film is removed;
microphase separating the directed self-assembly material layer to form a pattern containing a first part that includes the first segment and a second part that includes the second segment; and
removing either the first part or second part and using the other as a mask to process the first film.
11. The method of claim 10 , wherein removing the resist pattern comprises oxidizing the resist pattern.
12. The method of claim 11 , wherein removing the resist pattern comprises exposing the resist pattern to ozonated water.
13. The method of claim 11 , wherein removing the resist pattern comprises exposing the resist pattern to light in the vacuum-ultraviolet wavelength.
14. The method of claim 11 , wherein removing the resist pattern comprises exposing the resist pattern and the second layer to oxygen plasma.
15. The method of claim 14 , wherein the first region corresponds to the space pattern and the second region corresponds to the line pattern, and after removal of the resist pattern, the area of the second region is reduced.
16. The method of claim 10 , wherein the neutralization film alters the hydrophobicity of the first region.
17. The method of claim 16 , wherein the neutralization film alters the hydrophobicity of the second region.
18. A pattern formation method, comprising:
forming a base film on a substrate;
forming a spin on glass film on the base film;
forming a resist pattern having openings that expose a first region of the glass film;
removing the resist pattern to form second regions adjacent the first region;
forming a neutralization film on the second layer;
removing the neutralization film;
forming a directed self-assembly material layer on the glass film, the directed self assembly material layer containing a first segment and a second segment;
microphase separating the directed self-assembly material layer to form a directed self-assembly pattern containing a first part that includes the first segment and a second part that includes the second segment; and
removing either the first part or the second part and using the other as a mask to process the base film,
wherein:
the first region has a greater hydrophobicity than the second regions.
19. The method of claim 18 , wherein the neutralization film alters the hydrophobicity of the first region.