Directed self-assembly

A method for forming a device, the method comprising:

• blending, in a mixer within a fabrication facility, a first block copolymer and a solvent to form a first mixture, the first block copolymer comprising a first homopolymer and a second homopolymer;
• placing a substrate over a substrate holder of a processing chamber within the fabrication facility;
• and
• coating the substrate with the first mixture within the processing chamber.

A method for forming a device comprising:

• blending, in a mixer within a fabrication facility, a first liquid comprising a first block copolymer and a second liquid comprising a first homopolymer to form a first mixture, the first block copolymer comprising the first homopolymer and a second homopolymer;
• placing a substrate over a substrate holder of a processing chamber within the fabrication facility;
• and
• coating the substrate with the first mixture within the processing chamber.