Preserving filled features when vacuum wiping
View Patent ↗A method/process for curing imprint on a template prior to contact with a substrate. A curing process is used to adhere the imprint to a wafer or substrate. Monomer is deposited on a template and then partially cured using a UV exposure. The exposure is controlled so that the imprint is cured past the gel point, but still retains a thin liquid layer of uncured monomer at the surface that will bond with the wafer. Further, this partially cured layer enables the alignment adjustments between the template and the substrate to be performed after contact between the two without pulling any monomer out of the features.
1. In a nano-imprint lithography system, a method comprising:
depositing a monomer on a template having a pattern of nano-dimensional features to imprint into the monomer;
curing the monomer with UV light in a manner that leaves a thin layer of the monomer not fully cured, resulting in a partially cured monomer;
contacting a substrate to the partially cured monomer so that the thin layer of the monomer not fully cured bonds to the substrate;
performing a second curing of the monomer to complete curing of the partially cured monomer resulting in a fully cured monomer; and,
separating the fully cured monomer from the template.
2. The method as recited in claim 1 , further comprising vacuum wiping the monomer after it is deposited on the template to remove excess monomer.
3. The method as recited in claim 1 , wherein the monomer is deposited on the template in a scanning manner from one end of the template to the other end, and the UV light is scanned over the monomer as it is deposited in order to cure the monomer.
4. The method as recited in claim 2 , wherein the vacuum wiping is performed in a scanning manner from one end of the template to the other end, and the curing step is performed by scanning the UV light over the monomer by following the scanning of the vacuum wiping.
5. The method as recited in claim 1 , wherein the monomer is deposited on the template so that all of the nano-dimensional features are filled with the monomer.
6. The method as recited in claim 1 , wherein the monomer comprises two separate initiators, whereby a first of the two separate initiators cures at a faster rate than a second of the two separate initiators.
7. The method as recited in claim 6 , wherein the first curing process partially cures the monomer by curing a portion of the monomer containing the first of the two separate initiators.
8. In a nano-imprint lithography system, a method comprising:
depositing a monomer on a template having a pattern of nano-dimensional features to imprint into the monomer, wherein the monomer comprises two separate initiators, whereby a first of the two separate initiators cures at a faster rate than a second of the two separate initiators;
curing the monomer with UV light in a manner that cures a portion of the monomer containing the first of the two separate initiators leaving a thin layer of the monomer not fully cured, resulting in a partially cured monomer;
contacting a substrate to the partially cured monomer so that the thin layer of the monomer not fully cured bonds to the substrate; and
performing a second curing of the monomer with the UV light in a manner that cures a portion of the monomer containing the second of the two separate initiators, resulting in a fully cured monomer.
9. The method as recited in claim 8 , further comprising vacuum wiping the monomer after it is deposited on the template to remove excess monomer.
10. The method as recited in claim 8 , wherein the monomer is deposited on the template in a scanning manner from one end of the template to the other end, and the UV light is scanned over the monomer as it is deposited in order to cure the monomer.
11. The method as recited in claim 9 , wherein the vacuum wiping is performed in a scanning manner from one end of the template to the other end, and the curing step is performed by scanning the UV light over the monomer by following the scanning of the vacuum wiping.