Method for forming pattern

1. A method for forming a pattern comprising:

providing a first positive-working radiation-sensitive resin composition on a substrate to form a first resist layer, the first positive-working radiation-sensitive resin composition comprising:

a crosslinking agent;

a polymer containing an acid-unstable group and not containing a crosslinking group;

a radiation-sensitive acid generator; and

a solvent;

exposing the first resist layer selectively to radiation through a first mask;

developing the exposed first resist layer to form a first resist pattern;

making the first resist pattern inactive to radiation, or insolubilizing the first resist pattern in an alkaline developer or in a second positive-working radiation-sensitive resin composition;

providing the second positive-working radiation-sensitive resin composition on the substrate on which the first resist pattern has been formed to form a second resist layer;

exposing the second resist layer selectively in a space area of the first resist pattern to radiation through a second mask; and

developing the exposed second resist layer to form a second resist pattern in the space area of the first resist pattern,

wherein the crosslinking agent is a compound having two or more groups shown by a following formula (1), a compound having two or more epoxy groups or oxetane groups, or a compound having two or more vinyl groups and a skeleton shown by any one of following formulas (12-1) to (12-4),

wherein R 1 and R 2 each independently represent a hydrogen atom or a group shown by a following formula (2), at least one of R 1 and R 2 being a group shown by the following formula (2),

wherein R 3 and R 4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxyalkyl group having 1 to 6 carbon atoms, or R 3 and R 4 taken together represent a ring having 2 to 10 carbon atoms, and R 5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,

2. A method for forming a pattern comprising:

providing a first positive-working radiation-sensitive resin composition on a substrate to form a first resist layer, the first positive-working radiation-sensitive resin composition comprising:

a polymer containing a crosslinking group and an acid-unstable group;

a radiation-sensitive acid generator; and

a solvent;

exposing the first resist layer selectively to radiation through a first mask;

developing the exposed first resist layer to form a first resist pattern;

making the first resist pattern inactive to radiation, or insolubilizing the first resist pattern in an alkaline developer or in a second positive-working radiation-sensitive resin composition;

providing the second positive-working radiation-sensitive resin composition on the substrate on which the first resist pattern has been formed to form a second resist layer;

exposing the second resist layer selectively in a space area of the first resist pattern to radiation through a second mask; and

developing the exposed second resist layer to form a second resist pattern in the space area of the first resist pattern,

wherein the polymer includes at least one repeating unit which has the crosslinking group and which is derived from a monomer shown by following formulas (5-1) or (5-2),

wherein, R 10 represents a hydrogen atom, a methyl group, or a trifluoromethyl group, D represents a methylene group, an ethylene group, or a propylene group; and R 11 is a group shown by a following formula (5-1-A) or a following formula (5-1-B), R 12 represents a methylene group or an alkylene group having 2 to 6 carbon atoms, R 13 represents a hydrogen atom, a methyl group, or an ethyl group, and n is 0 or 1,

3. The method according to claim 1 , wherein the first resist pattern is made inactive by being heated at a 140° C. or higher temperature, or by being exposed to radiation at a wavelength of not more than 300 nm.

4. The method according to claim 2 , wherein the first resist pattern is made inactive by being heated at a 140° C. or higher temperature, or by being exposed to radiation at a wavelength of not more than 300 nm.