Block Copolymer Based Supramolecules for Organoelectronics

Block copolymer (BCP)-based supramolecules present unique advantages over conjugated BCPs to fabricate functional devices such as OLEDs and photovoltaics. The self assembly of 5'''-(3,7-dimethyloctyl)-5-(3-(3-hydroxyphenyl)propyl)-[2,2';5',2'';5'',2'''] quaterthiophene (4T) hydrogen bonded to the poly(4-vinylpyridine) (P4VP) block of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) BCP was studied in bulk and thin films. Lamellae-within-lamellae hierarchical structure was observed and can be macroscopically oriented at both length scales in thin films. Films of pure 4T, P4VP(4T) and PS-b-P4VP(4T) composites were investigated as organic field-effect transistors (OFETs). Phase behavior of blends of the BCP-based supramolecule and PCBM were also investigated to guide the fabrication of organic photovoltaics.