title: Bithiophene imide and benzodithiophene copolymers for efficient inverted polymer solar cells.
abstract: Bithiophene imide (BTI) and benzodithiophene (BDT) copolymers are synthesized for application in organic photovoltaic (OPV) cells. The electron deficiency of the BTI units leads to polymers with a low-lying HOMOs (∼-5.6 eV). Inverted solar cells are fabricated to investigate the OPV performance of the BTI-based polymers and achieve power conversion efficiencies up to 5.5%, with substantial V(oc)s above 0.9 V which are among the highest V(oc)s reported to date for polymer/PCBM solar cells. The results indicate that the BTI is a promising building block for constructing polymer donors for OPV applications.
authors.affiliation: Department of Materials Science and Engineering, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Nanjia
authors.initials: N
authors.lastname: Zhou
authors.forename: Xugang
authors.initials: X
authors.lastname: Guo
authors.forename: Rocio Ponce
authors.initials: RP
authors.lastname: Ortiz
authors.forename: Shiqiang
authors.initials: S
authors.lastname: Li
authors.forename: Shiming
authors.initials: S
authors.lastname: Zhang
authors.forename: Robert P H
authors.initials: RP
authors.lastname: Chang
authors.forename: Antonio
authors.initials: A
authors.lastname: Facchetti
authors.forename: Tobin J
authors.initials: TJ
authors.lastname: Marks
mesh_terms: D037741:Fullerenes / Q000737:chemistry; D007094:Imides / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D011789:Quantum Theory; D012993:Solar Energy; D013876:Thiophenes / Q000737:chemistry*
chemical_list: C539575:(6,6)-phenyl C61-butyric acid methyl ester; D037741:Fullerenes; D007094:Imides; D011108:Polymers; D011137:Polystyrenes; D013876:Thiophenes; C533756:poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)