Effect of polar additives on hole mobilities in photorefractive polymers

Arosha W. Goonesekera, Stephen Ducharme, James M. Takacs

Research output: Contribution to journalConference articlepeer-review


In this report, we demonstrate the effect of the polar non-linear chromophore and other polar additives on hole mobilities in photorefractive polymer systems. The hole mobility measurements are presented as a function of applied field and temperature in two model systems. The nonlinear optical chromophore 4′ nitro-4′-aminostilbene (NAS), having a large dipole moment of 6.7 Debye, is doped or covalently attached into a polymer matrix containing 30% by weight of diethylamino-benzaldehyde diphenyl hydrazone (DEH), a hole transport agent. The results are described by the Gaussian disorder model based on hopping through a manifold of states with superimposed energetic and positional disorder. We conclude from the results that the main effect produced by the polar additives is the reduced mobility, in agreement with the dipolar disorder model. The dipolar chromophores required in photorefractive polymers significantly decrease carrier mobility and also the speed of response.

Original languageEnglish (US)
Pages (from-to)195-206
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1997
EventXerographic Photoreceptors and Organic Photorefractive Materials II - San Diego, CA, United States
Duration: Jul 28 1997Jul 28 1997


  • Disorder
  • Hopping
  • Mobility
  • Nonlinear optical
  • Photorefractive
  • Polar additives

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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