title: Enforced one-dimensional photoconductivity in core-cladding hexabenzocoronenes.
abstract: Photoconductivity in contorted hexabenzocoronene liquid crystals is found to be exclusively one-dimensional. Spectroscopic measurements and density functional theory support the existence of two pi-systems attributed to a low-energy radialene-core and higher energy out-of-plane alkoxyphenyl rings. Persistent photocurrents, measured as a function of field, channel length, and intensity, fit a stretched exponential characteristic of intracolumnar transport, restricted through the radialene-core by the alkoxyphenyl-cladding. Bimolecular recombination is enhanced with increasing carrier concentration by the system's one-dimensionality.
authors.affiliation: Department of Chemistry, Columbia University, New York, New York 10027, USA.
authors.forename: Yaron S
authors.initials: YS
authors.lastname: Cohen
authors.forename: Shengxiong
authors.initials: S
authors.lastname: Xiao
authors.forename: Michael L
authors.initials: ML
authors.lastname: Steigerwald
authors.forename: Colin
authors.initials: C
authors.lastname: Nuckolls
authors.forename: Cherie R
authors.initials: CR
authors.lastname: Kagan