Method for forming patterns and method for producing patterned substrates
A resist layer constituted by a resist composition (which may include unavoidable impurities) including a polymerizable compound that includes polyfunctional monomers that become polymers having three dimensional structures by cross linking when polymerized and a polymerization initiating agent which is activated by one of light and an electron beam is formed on a substrate. A surface of a mold having a predetermined pattern of protrusions and recesses is pressed against the resist layer. Light is irradiated onto the resist layer to cure the resist layer. The mold is separated from the resist layer under conditions that the temperature of the resist layer is 40° C. or greater.
1. A method for forming a pattern, comprising:
forming a resist layer constituted by a resist composition which may include unavoidable impurities including a polymerizable compound that includes polyfunctional monomers that become polymers having three dimensional structures by cross linking when polymerized and a polymerization initiating agent which is activated by one of light and an electron beam on a substrate;
pressing a surface of a mold having a predetermined pattern of protrusions and recesses against the resist layer:
irradiating the light or the electron beam onto the resist layer to cure the resist layer; and
separating the mold from the resist layer under conditions that the temperature of the resist layer is 40° C. or greater.
2. A method for forming a pattern as defined in claim 1 , wherein
the mold is separated from the resist layer by causing the temperature of one of the substrate and the mold to be 40° C. or greater.
3. A method for forming a pattern as defined in claim 1 , wherein
the mold is separated from the resist layer under conditions that the temperature of the resist layer is 50° C. or greater.
4. A method for forming a pattern as defined in claim 1 , wherein
the mold is separated from the resist layer under conditions that the temperature of the resist layer is 120° C. or less.
5. A method for forming a pattern as defined in claim 1 , wherein:
the resist composition further includes a fluorine containing polymerizable compound.
6. A method for forming a pattern as defined in claim 5 , wherein:
the fluorine containing polymerizable compound is included in the resist composition at 5% by mass or less.
7. A method for forming a pattern as defined in claim 5 , wherein:
a fluorine containing polymerizable compound having monomers with a plurality of fluorine containing groups, which are at least one type of fluorine containing group selected from fluoroalkyl groups and fluoroalkyl ether groups, and at least two of the plurality of fluorine containing groups being separated by linking groups having a carbon number of 2 or greater, is employed as the fluorine containing polymerizable compound.
8. A method for forming a pattern as defined in claim 7 , wherein:
at least two of the fluorine containing groups are fluoroalkyl groups having a carbon number of 2 or greater.
9. A method for forming a pattern as defined in claim 1 , wherein:
the polymerizable compound that includes the polyfunctional monomers includes at least one type of polymerizable monomer represented by General Formula (1 ) below:
wherein Ar represents a bivalent or trivalent aromatic group that may have a substituent group, X represents a single bond or an organic linking group, R 1 represents a hydrogen atom or an alkyl group that may have a substituent group and n represents either 2 or 3.
10. A method for forming a pattern as defined in claim 9 , wherein:
the polymerizable compound including the polyfunctional monomers is in liquid form at 25° C.
11. A method for forming a pattern as defined in claim 9 , wherein:
the polymerizable compound including the polyfunctional monomers includes a monofunctional monomer having at least one of an aromatic ring structure or an alicyclic hydrocarbon structure.
12. A method for forming a pattern as defined in claim 1 , wherein:
the polymerizable compound that includes polyfunctional monomers does not contain fluorine.
13. A method for forming a pattern as defined in claim 1 , wherein:
the surface of the substrate on which the resist layer is formed is coated with an interfacial bonding agent that cross links the surface and the resist layer, prior to forming the resist layer on the substrate.
14. A method for producing patterned substrates, comprising:
forming a resist layer on a substrate by the method for forming a pattern as defined in claim 1 ; and
forming a pattern of protrusions and recesses based on the pattern of the resist layer on the substrate, by executing a lithography method using the resist layer as a mask.