Jump to main content
Jump to site search

Issue 8, 1999
Previous Article Next Article

Transient photoconduction in discotic liquid crystals

Abstract

The hole transport properties of ester substituted hexaalkyloxytriphenylenes are investigated and compared with the materials without ester substituents. The high hole mobilities of the recently investigated discotic liquid crystals of the hexaalkyloxytriphenylene-type are restricted to the very small temperature range of their mesophase. It is extended substantially by substitution of one ester group, as this hinders crystallization and results in glass formation. It is found that the substitution of an ester group alters the temperature and field dependence of the mobility completely. In the ester substituted compounds the mobility µ is not independent of temperature but follows a ln µ∝1/T2 law. We attribute this to the dipole moment of the ester group which causes random fluctuations in the local electric field and leads to disorder dominated charge carrier hopping as the prevailing transport mechanism.

Back to tab navigation

Article type: Paper
DOI: 10.1039/A808615J
Citation: Phys. Chem. Chem. Phys., 1999,1, 1757-1760
  •   Request permissions

    Transient photoconduction in discotic liquid crystals

    A. Ochse, A. Kettner, J. Kopitzke, J. H. Wendorff and H. Bässler, Phys. Chem. Chem. Phys., 1999, 1, 1757
    DOI: 10.1039/A808615J

Search articles by author

Spotlight

Advertisements