title: Small molecule BHJ solar cells based on DPP(TBFu)2 and diphenylmethanofullerenes (DPM): linking morphology, transport, recombination and crystallinity.
abstract: The effect of alkyl chains in substituted diphenylmethano[70]fullerenes (C70-DPM) on the device characteristics of DPP(TBFu)2 small molecule-based bulk heterojunction (BHJ) organic solar cell devices is investigated. By measuring charge carrier mobilities as well as the morphology and crystallinity of each device we have been able to understand and explain the differences found between solar cells made with the different C70-DPM fullerenes despite the general lack of simple relationships between the molecular structure, orbital level positioning and power conversion efficiency. Our study then concludes with some general rules for the future design of acceptors for DPP(TBFu)2 containing photoactive layers in the search for efficient organic solar cells.
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans, 16, Tarragona 43007, Spain. epalomares@iciq.es nazmar@quim.ucm.es.
authors.forename: Daniel
authors.initials: D
authors.lastname: Fernández
authors.forename: Aurélien
authors.initials: A
authors.lastname: Viterisi
authors.forename: James William
authors.initials: JW
authors.lastname: Ryan
authors.forename: Francesc
authors.initials: F
authors.lastname: Gispert-Guirado
authors.forename: Sara
authors.initials: S
authors.lastname: Vidal
authors.forename: Salvatore
authors.initials: S
authors.lastname: Filippone
authors.forename: Nazario
authors.initials: N
authors.lastname: Martín
authors.forename: Emilio
authors.initials: E
authors.lastname: Palomares