Resist applying and developing method, resist film processing unit, and resist applying and developing apparatus comprising the unit
A resist film processing unit is disclosed that can improve an etching resistance of a resist film formed on a substrate. The resist film processing unit includes a light source to irradiate an ultraviolet light on a resist film patterned by a development process, a heating part configured to heat the resist film irradiated with the ultraviolet light by the light source, and a solvent processing unit configured to expose the resist film to a solvent gas including a solvent that contains a benzene ring, during or after heating of the resist film by the heating part.
1. A resist applying and developing method comprising:
forming a resist film on a substrate;
exposing the resist film formed on the substrate to a light generated by an ArF excimer laser using a reticle;
developing the exposed resist film, thereby patterning the resist film on the substrate;
decomposing an adamantly group and/or a lactone group serving as a protection group in the resist film by irradiating an ultraviolet light on the resist film patterned by the developing;
heating the resist film, during or after the irradiation of the ultraviolet light, thereby facilitating decomposition of the adamantly group and/or the lactone group; and
introducing a benzene ring to the protection group in the resist film by exposing the resist film to a solvent gas that contains the benzene ring, during or after the heating of the resist film.
2. The resist applying and developing method according to claim 1 , wherein the solvent is a phenolic solvent selected from a phenol group.
3. The resist applying and developing method according to claim 2 , wherein the phenolic solvent is m-methylphenol.
4. The resist applying and developing method according to claim 1 , wherein an ArF (Argon Fluoride) light source is used in the exposing of the resist film.
5. The resist applying and developing method according to claim 1 , wherein the wavelength of the ultraviolet light ranges from 150 nm to 450 nm.