Hole mobility within arylamine-containing polyfluorene copolymers: A time-of-flight transient-photocurrent study

R. U. A. Khan, D. Poplavskyy, T. Kreouzis, and D. D. C. Bradley
Phys. Rev. B 75, 035215 – Published 31 January 2007

Abstract

We report a time-of-flight transient photocurrent study of the hole mobility, measured as a function of electric field and temperature, within (i) poly(9,9-dioctylfluorene), (ii) poly(9,9-dioctylfluorene-co-bis-N,N-(4-butylphenyl)-bis-N,N-phenyl-1,4-phenylenediamine) (PFB), and (iii) three copolymers that contain differing proportions of the moieties 9,9-dioctylfluorene, N-(4-butylphenyl)diphenylamine, and bis-N,N-(4-butylphenyl)-bis-N,N-phenyl-1,4-phenylenediamine. The results are analyzed using the Gaussian disorder model as proposed by H. Bässler [Phys. Status Solidi B 175, 15 (1993)], the correlated disorder model as proposed by S. V. Novikov et al. [Phys. Rev. Lett. 81, 4472 (1998)], and finally, the polaronic correlated disorder model of R. E. Parris et al. [Phys. Rev. Lett. 87, 126601 (2001)]. We deduce values for the corresponding energetic and spatial disorder parameters, intersite hopping distance, wave-function decay constant, and polaronic activation energy, and consider how variations in chemical structure impact thereon.

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  • Received 17 May 2006

DOI:https://doi.org/10.1103/PhysRevB.75.035215

©2007 American Physical Society

Authors & Affiliations

R. U. A. Khan*, D. Poplavskyy, T. Kreouzis, and D. D. C. Bradley

  • Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom

  • *Corresponding author. Present address: The Diamond Trading Company, Belmont Road, Maidenhead, Berkshire SL6 6JW, United Kingdom. Electronic address: riz.khan@dtc.com
  • Present address: Innovalight, Inc., 3303 Octavius Drive, Suite 104, Santa Clara, California 950544, USA.
  • Present address: Department of Physics, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom.

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Issue

Vol. 75, Iss. 3 — 15 January 2007

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