title: Chiroselective assembly of a chiral porphyrin-fullerene dyad: photoconductive nanofiber with a top-class ambipolar charge-carrier mobility.
abstract: Upon slow admission of MeOH, the enantiomerically pure form of chiral amphiphilic porphyrin-fullerene dyad 1 in CH(2)Cl(2) self-assembles at 25 degrees C into nanofibers with a built-in donor/acceptor heterojunction, while its racemic form, under identical conditions, self-assembles into submicrometer-sized spheres with a donor/acceptor arrangement essentially different from that in the nanofiber assembly. Although a cast film of the latter hardly shows a photoconducting profile on micrometer-gap electrodes, the former sample clearly displays photoconduction with an ambipolar charge-transporting character. The electron and hole mobilities under zero electric field, as estimated from time-of-flight profiles, are 0.14 and 0.10 cm(2) V(-1) s(-1), respectively, which are comparable to or even better than those reported for top-class organic materials with a donor/acceptor heterojunction.
authors.affiliation: School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Yumi
authors.initials: Y
authors.lastname: Hizume
authors.forename: Kentaro
authors.initials: K
authors.lastname: Tashiro
authors.forename: Richard
authors.initials: R
authors.lastname: Charvet
authors.forename: Yohei
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Akinori
authors.initials: A
authors.lastname: Saeki
authors.forename: Shu
authors.initials: S
authors.lastname: Seki
authors.forename: Takuzo
authors.initials: T
authors.lastname: Aida