title: A soluble high molecular weight copolymer of benzo[1,2-b:4,5-b']dithiophene and benzoxadiazole for efficient organic photovoltaics.
abstract: The synthesis and characterization of a soluble high molecular weight copolymer based on 4,8-bis(1-pentylhexyloxy)benzo[1,2-b:4,5-b']dithiophene and 2,1,3-benzoxadiazole is presented. High efficiency organic photovoltaic (OPV) devices comprised of this polymer and phenyl-C(71) -butyric acid methyl ester (PC(71) BM) were fabricated by additive processing with 1-chloronapthalene (CN). When the active layer is cast from pristine chlorobenzene (CB), power conversion efficiencies (PCEs) average 1.41%. Our best condition-using 2% chloronapthalene as a solvent additive in CB-results in an average PCE of 5.65%, with a champion efficiency of 6.05%.
authors.affiliation: Department of Physics, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Wanyi
authors.initials: W
authors.lastname: Nie
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Macneill
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.forename: Ronald E
authors.initials: RE
authors.lastname: Noftle
authors.forename: David L
authors.initials: DL
authors.lastname: Carroll
authors.forename: Robert C
authors.initials: RC
authors.lastname: Coffin
mesh_terms: D011211:Electric Power Supplies; D015394:Molecular Structure; D008970:Molecular Weight; D010069:Oxadiazoles / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D012993:Solar Energy; D013876:Thiophenes / Q000737:chemistry*
chemical_list: D010069:Oxadiazoles; D011108:Polymers; D013876:Thiophenes