Abstract: A pattern-forming method includes forming a prepattern that is insoluble or hardly soluble in an organic solvent. A resin layer is provided on at least a lateral face of the prepattern. The prepattern and the resin layer are heated such that an adjacent portion of the resin layer to the prepattern is made insoluble or hardly soluble in the organic solvent, without being accompanied by an increase of a molecular weight of the prepattern and the resin layer. A portion of the resin layer other than the adjacent portion of the resin layer is removed. The resin layer is formed from a first composition including a first polymer and an organic solvent. Solubility of the first polymer in the organic solvent does not substantially change due to an action of an acid. A weight average molecular weight of the first polymer is 15,000-150,000.

Abstract: A pattern-forming method includes forming a prepattern that is insoluble or hardly soluble in an organic solvent. A resin layer is provided on at least a lateral face of the prepattern. The prepattern and the resin layer are heated such that an adjacent portion of the resin layer to the prepattern is made insoluble or hardly soluble in the organic solvent, without being accompanied by an increase of a molecular weight of the prepattern and the resin layer. A portion of the resin layer other than the adjacent portion of the resin layer is removed. The resin layer is formed from a first composition including a first polymer and an organic solvent. Solubility of the first polymer in the organic solvent does not substantially change due to an action of an acid. A weight average molecular weight of the first polymer is 15,000-150,000.