Complex TCNQ salts with asymmetric donors. I. Transport properties

K. Holczer, G. Mihaly, A. Janossy, G. Gruner, M. Kertesz

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The temperature dependence of transport properties (DC conductivity, 9.1 GHz conductivity and dielectric constant, thermoelectric power) measured on single crystals of a series of well-conducting, complex, charge-transfer salts of the form D(TCNQ)2 is presented. In all except one case the donors are asymmetric and the corresponding dipole moments were calculated by a molecular orbital method. It is demonstrated that donors with large dipole moments are arranged regularly leading to a charge-ordered state with low conductivity and a large energy gap. Smaller donor dipoles are stacked randomly. When intrachain and interchain Coulomb forces are much larger than the random donor-acceptor interactions the material is a band semiconductor with a small but well-defined energy gap. For large random site energies random localization is important; the implication of this on the transport properties is discussed in view of different theories.

Original languageEnglish
Article number016
Pages (from-to)4707-4725
Number of pages19
JournalJournal of Physics C: Solid State Physics
Volume11
Issue number23
DOIs
Publication statusPublished - Dec 1 1978

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)
  • Physics and Astronomy(all)

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