title: Ternary photovoltaic blends incorporating an all-conjugated donor-acceptor diblock copolymer.
abstract: We present a new fully conjugated diblock copolymer, P3HT-b-PFTBTT, containing donor and acceptor blocks with suitably positioned energy levels for use in a solar cell. This is the first block copolymer to be based on an existing high-performance polymer:polymer blend. We observe phase separation of the blocks and self-assembly behavior. In ternary blends with the respective homopolymers the diblock copolymer introduces lateral nanostructure without restricting P3HT crystallization in the charge transport direction, resulting in standing lamellae. By adding the diblock to the homopolymer blend as a compatibilizer, we prevent phase separation at elevated temperatures and benefit from a dramatic increase in P3HT ordering, allowing us to demonstrate polymer blend photovoltaics where the nanostructure is thermodynamically, rather than kinetically, controlled.
authors: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, U.K. rcm48@cam.ac.uk
authors: Rhiannon C
authors: RC
authors: Mulherin
authors: Stefan
authors: S
authors: Jung
authors: Sven
authors: S
authors: Huettner
authors: Kerr
authors: K
authors: Johnson
authors: Peter
authors: P
authors: Kohn
authors: Michael
authors: M
authors: Sommer
authors: Sybille
authors: S
authors: Allard
authors: Ullrich
authors: U
authors: Scherf
authors: Neil C
authors: NC
authors: Greenham
mesh_terms: D011211:Electric Power Supplies; D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects; D036103:Nanotechnology / Q000295:instrumentation*; D016566:Organoselenium Compounds / Q000737:chemistry* / Q000528:radiation effects; D010316:Particle Size; D012993:Solar Energy
chemical_list: D016566:Organoselenium Compounds; C526212:poly(3-hexyl)selenophene