Patent ID: 7648818
Filing Date: 2010-01-19
Classification: G03F

Abstract:
1. A method for carrying out lithography with a carbon dioxide development system, comprising the steps of: (a) providing a substrate, the substrate having a resist layer formed thereon, said resist layer comprising a polymer and a photoacid generator, wherein said polymer is insoluble in carbon dioxide; (b) exposing at least one portion of the resist layer to radiant energy causing a chemical shift to take place in the exposed portion and thereby form at least one light field region in the resist layer while concurrently maintaining at least one portion of the resist layer unexposed to the radiant energy to thereby form at least one dark field region in the polymer resist layer; (c) optionally baking the resist layer; (d) contacting the resist layer to at least one derivatizing agent under conditions in which the at least one light field or dark field region is preferentially modified with the derivitaizing agents as compared to the at least one dark field or light field region, respectively; and then (e) contacting the resist layer with a rinse composition comprising carbon dioxide such that the light or dark field is preferentially removed from the substrate; wherein said at least one derivatizing agent comprises an onium salt or a neutral uncharged compound.