title: Picosecond transient photoconductivity in functionalized pentacene molecular crystals probed by terahertz pulse spectroscopy.
abstract: We have measured transient photoconductivity in functionalized pentacene molecular crystals using ultrafast optical pump-terahertz probe techniques. The single crystal samples were excited using 800 nm, 100 fs pulses, and the change in transmission of time-delayed, subpicosecond terahertz pulses was used to probe the photoconducting state over a temperature range from 10 to 300 K. A subpicosecond rise in photoconductivity is observed, suggesting that mobile carriers are a primary photoexcitation. At times longer than 4 ps, a power-law decay is observed consistent with dispersive transport.
authors.affiliation: Department of Physics, University of Alberta, Edmonton, Canada T6G 2J1. hegmann@phys.ualberta.ca
authors.forename: F A
authors.initials: FA
authors.lastname: Hegmann
authors.forename: R R
authors.initials: RR
authors.lastname: Tykwinski
authors.forename: K P H
authors.initials: KP
authors.lastname: Lui
authors.forename: J E
authors.initials: JE
authors.lastname: Bullock
authors.forename: J E
authors.initials: JE
authors.lastname: Anthony