Patent ID: 9599890
Date: 2017-03-21
CPC Classifications: B82Y,C08L,G03F,H01L

Claim:
1. A method for manufacturing nanolithography masks from a PS-b-PMMA block copolymer film deposited on a surface to be etched, said block copolymer film comprising PMMA nanodomains orientated perpendicularly to the surface to be etched, wherein said method comprises the following steps: selectively irradiating said block copolymer film to form first irradiated areas and non-irradiated areas in said block copolymer film, then treating said copolymer film in a developer solvent previously selected to selectively remove one or more nanodomains of said block copolymer film, said nanodomains being of different chemical composition, irradiated and/or non-irradiated, the selective removal consisting of removing at least said PMMA nanodomains of said irradiated areas of said block copolymer film, said developer solvent being selected from the group of solvents or solvent mixtures having Hansen solubility parameters, calculated at 25° C., within the following value ranges: 14.5≦δ