Influence of dipole moment of the transport agents on the carrier mobility in photorefractive polymers

Arosha Goonesekera, Stephen Ducharme, James M. Takacs

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


In this report, we demonstrate the effect of the dipole moment of the charge transport agent on carrier mobilities in photorefractive polymer systems. The charge carrier mobility measurements are presented as a function of applied field and temperature in several model systems. In these model systems, 30% by weight of a hole or an electron transport agent covering a range of dipole moments from 0.8 to 4 Debye, is doped into a polystyrene (PS) polymer matrix containing 25% by weight of the nonlinear optical chromophore 2,5-dimethyl-4-(p-nitrophenylazo)phenol (EHDNPB) having a dipole moment of 7.6 Debye. The results are described by the Gaussian disorder model (GDM) based on hopping through a manifold of states with superimposed energetic and positional disorder, with the addition of a dipolar disorder contribution. We conclude from the results that the dipole moment of the charge transport agent has a strong influence on carrier mobility even in the presence of strongly polar nonlinear optical chromophores. Transport agents with low dipole moments significantly increase the carrier mobility and thus provides a useful alternative approach to improve photorefractive speeds.

Original languageEnglish (US)
Pages (from-to)4-15
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventXerographic Photoreceptors and Organic Photorefractic Materials IV - San Diego, CA, United States
Duration: Jul 22 1998Jul 23 1998


  • Dipole moment
  • Energetic disorder
  • Mobility
  • Molecularly doped polymers
  • Photorefractive polymers
  • Transport agents

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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