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Anisotropic charge transport in organic single crystals based on dipolar molecules

Authors
Journal
Organic Electronics
1566-1199
Publisher
Elsevier
Publication Date
Volume
9
Issue
6
Identifiers
DOI: 10.1016/j.orgel.2008.07.006
Keywords
  • Organic Semiconductors
  • Single Crystals
  • Deep Traps
  • Anisotropic Transport

Abstract

Abstract We studied the anisotropic charge transport properties of solution-grown organic single crystals based on a dipolar molecule (4-hydroxy-cyanobenzene) by field effect devices and by spectral photocurrent analyses. Optical excitation differently affects the flow of charge carriers along the two main planar crystal axes, altering the charge transport anisotropy induced by the molecular π-orbitals stacking. We attribute this behaviour to the presence of an intrinsic molecular dipole and to its different orientation within the crystal lattice and we advance a hypothesis on the nature of the observed band of deep trapping states.

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