Plasma curing of MSQ-based porous low-K film material

摘要

Low dielectric constant film materials with improved elastic modulus. The method of making such film materials involves providing a porous methyl silsesquioxane based dielectric film material produced from a resin containing at least 2 Si-CH3 groups and plasma curing the porous film material to convert the film into porous silica. Plasma curing of the porous film material yields a film with improved modulus and outgassing properties. The improvement in elastic modulus is typically greater than about 100%, and more typically greater than about 200%. The film is plasma cured for between about 15 and about 120 seconds at a temperature less than about 350° C. The plasma cured porous film material can optionally be annealed. The annealing of the plasma cured film may reduce the dielectric constant of the film while maintaining an improved elastic modulus as compared to the plasma cured porous film material. The annealing temperature is typically less than about 450° C. The annealed, plasma cured film has a dielectric constant in the range of from about 1.1 to about 2.4 and an improved elastic modulus.