Large area orientation of block copolymer microdomains in thin films

A method comprising:

• phase separating components of a block copolymer in the presence of a crystallizable solvent.

A method comprising:

• dissolving a block copolymer in a solvent having a boiling point greater than 50° C.;
• and
• phase separating components of the block copolymer.

A portion of a film including a pattern of nanostructures, comprising:

• components of a block copolymer phase separated by at least one of directional solidification and epitaxy to form a pattern including a plurality of microdomains, a first set of microdomains including a first component of the block copolymer forming a first structure type having a first orientation, and a second set of microdomains including a second component of the block copolymer forming a second structure type having a second orientation, wherein the first and second sets of microdomains are periodically oriented spatially and regularly oriented directionally.