Methods of forming patterns using imprint process
View Patent ↗A method for forming patterns is provided. The method includes forming a resist layer on a substrate, imprinting a convex pattern and a concave pattern on the resist layer using a template, forming a silicon diffusion layer containing silicon containing diffusion species in an upper portion of the convex pattern, and selectively removing a recessed portion of the resist layer under the concave pattern using the silicon diffusion layer as an etch mask.
1. A method for forming patterns, the method comprising:
forming a resist layer on a substrate;
imprinting a convex pattern and a concave pattern on the resist layer using a template;
forming a silicon free buffer layer on the resist layer to fill the concave pattern;
forming a silicon source layer on the buffer layer;
diffusing silicon containing diffusion species in the silicon source layer into an upper portion of the convex pattern to form a silicon diffusion layer;
selectively removing the silicon source layer and the buffer layer; and
selectively removing a recessed portion of the resist layer under the concave pattern using the silicon diffusion layer as an etch mask,
wherein the buffer layer separates the silicon source layer from the resist layer.
2. The method of claim 1 , wherein the buffer layer includes a silicon free polymeric material which is immiscible with the resist layer.
3. The method of claim 2 , wherein the forming of the buffer layer includes:
preparing a solution;
coating the solution on the resist layer using a spin-coating process; and
evaporating a solvent contained in the coated solution.
4. The method of claim 1 , wherein the buffer layer is formed to cover the convex pattern.
5. The method of claim 1 , wherein the buffer layer is formed to provide a flat surface of the silicon source layer.
6. The method of claim 1 , wherein the silicon source layer includes silicon containing polymer molecules that function as the silicon containing diffusion species.
7. The method of claim 6 , wherein each of the silicon containing polymer molecules has a unit structure including a silicon atom and an oxygen atom bonded to the silicon atom.
8. The method of claim 1 ,
wherein the silicon source layer is formed by spin-coating a silicon containing solution on the buffer layer; and
wherein the silicon containing solution is provided to include silicon containing polymer molecules dissolved in a solvent.
9. The method of claim 1 , wherein the diffusing silicon containing diffusion species in the silicon source layer are diffused into the upper portion of the convex pattern using an annealing process performed at a temperature of about 80 degrees Celsius to about 130 degrees Celsius.
10. The method of claim 1 , wherein the forming of the resist layer includes spin-coating a photosensitive resist material on the substrate.
11. The method of claim 1 , wherein the imprinting of the convex pattern and the concave pattern includes:
pressing down a transfer pattern of the template into the resist layer to form the convex pattern and the concave pattern; and
irradiating an ultraviolet (UV) ray onto the resist layer to cure the resist layer having the convex pattern and the concave pattern.
12. A method for forming patterns, the method comprising:
forming a resist layer on a substrate;
imprinting a convex pattern and a concave pattern on the resist layer using a template;
forming a silicon diffusion layer containing silicon containing diffusion species in an upper portion of the convex pattern; and
selectively removing a recessed portion of the resist layer under the concave pattern using the silicon diffusion layer as an etch mask,
wherein the silicon diffusion layer exposes the recessed portion of the resist layer.
13. The method of claim 12 , further comprising forming a buffer layer that substantially prevents the silicon containing diffusion species from being diffused into the recessed portion of the resist layer.
14. The method of claim 13 , wherein the buffer layer includes a silicon free polymeric material which is immiscible with the resist layer.
15. The method of claim 14 , wherein the forming of the buffer layer includes:
preparing a solution;
coating the solution on the resist layer using a spin-coating process; and
evaporating a solvent contained in the coated solution.
16. The method of claim 15 , wherein the buffer layer is formed to cover the convex pattern.
17. The method of claim 16 , wherein the forming of the silicon diffusion layer includes diffusing the silicon containing diffusion species so that the silicon containing diffusion species penetrate the buffer layer to reach the upper portion of the convex pattern.
18. The method of claim 12 , wherein the forming of the resist layer includes spin-coating a photosensitive resist material on the substrate.
19. The method of claim 12 , wherein the imprinting of the convex pattern and the concave pattern includes:
pressing down a transfer pattern of the template into the resist layer to form the convex pattern and the concave pattern; and
irradiating an ultraviolet (UV) ray onto the resist layer to cure the resist layer having the convex pattern and the concave pattern.