Method for fabricating soft mold and pattern forming method using the same
View Patent ↗A method for forming a soft mold includes providing a master mold having at least one pattern thereon, forming pre-polymer layer on the master mold, applying water on the pre-polymer layer, hardening the pre-polymer layer to form a soft mold, removing water, and separating the soft mold from the master mold. A method for forming a pattern comprises forming a resist on an etching subject layer, providing a soft mold, disposing the soft mold on the resist, separating the soft mold from the resist to form the resist pattern, and etching the etching subject layer by using the resist pattern, wherein providing the soft mold comprises providing a master mold having at least one pattern thereon, forming pre-polymer layer on the master mold, applying water on the pre-polymer layer, hardening the pre-polymer layer to form a soft mold, removing water, and separating the soft mold from the master mold.
1. A method for fabricating a soft mold comprising:
forming a master mold in a container, the master mold having side surfaces and a patterned upper surface;
introducing a pre-polymer mixture into the container to cover the patterned upper surface and the side surfaces of the master mold, the pre-polymer mixture having a hydrophobic compound;
soft-hardening the introduced pre-polymer mixture to form a pre-polymer gel, a front surface of the pre-polymer gel contacting the patterned upper surface of the master mold and a rear surface of the pre-polymer gel opposing the front surface being exposed to air;
applying water onto the rear surface of the pre-polymer gel to increase surface energy at the rear surface beyond a surface energy at the front surface of the pre-polymer gel, thereby moving the hydrophobic compound to the front surface of the pre-polymer gel;
hardening the pre-polymer gel while said water remains on the rear surface thereof to form a patterned soft mold;
removing the water from the soft mold; and
separating the soft mold from the master mold.
2. The method of claim 1 , wherein the hydrophobic compound comprises fluorine (F).
3. The method of claim 2 , wherein the hydrophobic compound is CF 3 (CF 2 ) n CH═CH 2 and the pre-polymer is PDMS (polydimethylsiloxane), where 2≦n≦15.
4. The method of claim 3 , wherein the hydrophobic compound is approximately 0.01 wt % to 5 wt % of the mixture.
5. The method of claim 1 , wherein said hardening takes place at room temperature.
6. The method of claim 1 , wherein said hardening takes place by increasing temperature.
7. The method of claim 1 , further comprising:
attaching a back plate to a rear surface of the soft mold before said separating; and
conducting said separating by integrally separating the back plate and the soft mold from the master mold.
8. The method of claim 7 , wherein the back plate is made of one of glass or PET (polyethylene terephthalate).
9. The method of claim 1 , wherein providing the master mold comprises:
initially forming a main body of the master mold; and
forming the pattern of the patterned upper surface on the main body.
10. The method of claim 1 , further comprising plasma-processing the master mold with a compound containing fluorine before said introducing of the pre-polymer mixture.
11. The method of claim 10 , wherein said plasma-processing forms a self-assembled monolayer on the master mold.