Dispersive charge transport due to strong charge-dipole interactions of cyano-group in the cyano-carbazole based molecular glass

Dong Keun Oh, Sung Mok Hong, Cheol Eui Lee, B. S. Kim, J. I. Jin

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Using the time of flight (ToF) method, we investigated the bipolar charge transport for two glass-forming molecules containing carbazole and cyano-carbazole moiety. The enhanced electron mobility was observed in the cyano-carbazole compound. From the numerical method based the Laplace formalism, the distribution of hole trapping energy was obtained for the carbazole compound. This result was compared with the exponential distribution extracted from dispersion parameter for the cyano-carbazole material. Considering charge-dipole interactions as a reason for the disordered trapping mechanism, we discussed dispersive charge transport induced by a strong dipolar (i.e. cyano) group by comparing the distributions of hole trapping sites for two compounds.

Original languageEnglish
Pages (from-to)585-590
Number of pages6
JournalSolid State Communications
Issue number11-12
Publication statusPublished - 2005 Dec 1



  • A. Disordered system
  • A. Organic glasses
  • D. Electronic transport
  • D. Recombination and trapping

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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