Patent ID: 8372295

Claim:
A method for fabricating a film comprising nanoscale microstructures, comprising: forming a first film comprising a self-assembling block copolymer within a trench in a substrate, the trench having a floor, sidewalls, a width and a length; annealing the first film to form a base layer comprising self-assembled polymer domains registered to the sidewalls and extending the length of the trench; crosslinking polymer domains of the base layer; forming a second film comprising a self-assembling block copolymer over the crosslinked base layer and over the substrate adjacent the trench, the second film having a thickness over the substrate insufficient for the second film to self-assemble to form ordered structures upon annealing; annealing the second film within the trench and on the substrate to self-assemble the second film within the trench to form polymer domains registered to corresponding polymer domains of the base layer and the annealed film on the substrate outside the trench comprises non-ordered polymer material; and crosslinking polymer domains of the second film.