title: [70]fullerene-based materials for organic solar cells.
abstract: The synthesis, characterization and photovoltaic study of two novel derivatives of [70]fullerene, phenyl-C₇₁-propionic acid propyl ester ([70]PCPP) and phenyl-C₇₁-propionic acid butyl ester ([70]PCPB), are reported. [70]PCPP and [70]PCPB outperform the conventional material (6,6)-phenyl-C₇₁-butyric acid methyl ester ([70]PCBM) in solar cells based on poly(2-methoxy-5-{3',7'-dimethyloctyloxy}-p-phenylene vinylene) (MDMO-PPV) as a donor polymer using chlorobenzene (CB) or dichlorobenzene (DCB) as solvents. AFM data suggest that improvement of the device efficiency should be attributed to the increased phase compatibility between the novel C₇₀ derivatives and the polymer matrix. [70]PCPP and [70]PCBM showed more or less equally high performances in solar cells comprising poly(3-hexylthiophene) (P3HT) as a donor polymer. Optical modeling revealed that the application of [70]fullerene derivatives as acceptor materials in P3HT-based bulk heterojunction solar cells might give approximately 10 % higher short circuit current densities than using C₆₀-based materials such as [60]PCBM. The high solubility of [70]PCPP and [70]PCPB and their good compatibility with the donor polymers suggest these fullerene derivatives as promising electron acceptor materials for use in efficient bulk heterojunction organic solar cells.
authors.affiliation: Institute of Problems of Chemical Physics of Russian Academy of Sciences, Moscow region, Russia. troshin2003@inbox.ru
authors.forename: Pavel A
authors.initials: PA
authors.lastname: Troshin
authors.forename: Harald
authors.initials: H
authors.lastname: Hoppe
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Peregudov
authors.forename: Martin
authors.initials: M
authors.lastname: Egginger
authors.forename: Sviatoslav
authors.initials: S
authors.lastname: Shokhovets
authors.forename: Gerhard
authors.initials: G
authors.lastname: Gobsch
authors.forename: N Serdar
authors.initials: NS
authors.lastname: Sariciftci
authors.forename: Vladimir F
authors.initials: VF
authors.lastname: Razumov
mesh_terms: D000042:Absorption; D002722:Chlorobenzenes / Q000737:chemistry; D011211:Electric Power Supplies; D004952:Esters; D037741:Fullerenes / Q000737:chemistry*; D055620:Optical Phenomena; D009930:Organic Chemicals / Q000737:chemistry*; D011422:Propionates / Q000737:chemistry; D012993:Solar Energy; D012995:Solubility; D013876:Thiophenes / Q000737:chemistry
chemical_list: D002722:Chlorobenzenes; D004952:Esters; D037741:Fullerenes; D009930:Organic Chemicals; D011422:Propionates; D013876:Thiophenes; C507295:poly(3-hexylthiophene); C069836:fullerene C70; C029658:propionic acid; C031294:chlorobenzene