title: Narrow-band-gap conjugated chromophores with extended molecular lengths.
abstract: The influence of extending the molecular length of donor-acceptor chromophores on properties relevant to organic optoelectronic devices has been studied by using two new narrow-band-gap systems. Most significantly, we find that the higher molecular weight systems exhibit higher thermal stabilities (beyond 200 °C) when introduced into field effect transistor devices. It is also possible to fabricate bulk heterojunction solar cells using PC(61)BM with power conversion efficiencies >6%. These high values are not heavily influenced by the blend composition and are achieved without the influence of solvent additives or postdeposition thermal annealing.
authors.affiliation: Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Liu
authors.forename: Yanming
authors.initials: Y
authors.lastname: Sun
authors.forename: Louis A
authors.initials: LA
authors.lastname: Perez
authors.forename: Wen
authors.initials: W
authors.lastname: Wen
authors.forename: Michael F
authors.initials: MF
authors.lastname: Toney
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Heeger
authors.forename: Guillermo C
authors.initials: GC
authors.lastname: Bazan