Complex TCNQ salts with asymmetric donors. I. Transport properties

K. Holczer, G. Mihály, A. Jánossy, 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 - 1978

Fingerprint

Dipole moment
Transport properties
dipole moments
Energy gap
Salts
transport properties
salts
conductivity
low conductivity
Thermoelectric power
Beam plasma interactions
Molecular orbitals
Charge transfer
molecular orbitals
Permittivity
direct current
charge transfer
Single crystals
permittivity
Semiconductor materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Complex TCNQ salts with asymmetric donors. I. Transport properties. / Holczer, K.; Mihály, G.; Jánossy, A.; Gruner, G.; Kertesz, M.

In: Journal of Physics C: Solid State Physics, Vol. 11, No. 23, 016, 1978, p. 4707-4725.

Research output: Contribution to journalArticle

@article{d263e5b2c8bc47b5926b0adf13a31d28,
title = "Complex TCNQ salts with asymmetric donors. I. Transport properties",
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.",
author = "K. Holczer and G. Mih{\'a}ly and A. J{\'a}nossy and G. Gruner and M. Kertesz",
year = "1978",
doi = "10.1088/0022-3719/11/23/016",
language = "English",
volume = "11",
pages = "4707--4725",
journal = "Journal of Physics Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing Ltd.",
number = "23",

}

TY - JOUR

T1 - Complex TCNQ salts with asymmetric donors. I. Transport properties

AU - Holczer, K.

AU - Mihály, G.

AU - Jánossy, A.

AU - Gruner, G.

AU - Kertesz, M.

PY - 1978

Y1 - 1978

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0343884562&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0343884562&partnerID=8YFLogxK

U2 - 10.1088/0022-3719/11/23/016

DO - 10.1088/0022-3719/11/23/016

M3 - Article

AN - SCOPUS:0343884562

VL - 11

SP - 4707

EP - 4725

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 23

M1 - 016

ER -