Pressure dependence of d.c. conductivity in poly(3-alkylthiophenes)

Heikki Isotalo, Markus Ahlskog, Henrik Stubb

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

Pressure dependence of d.c. conductivity of poly(3-octylthiophene) (POT), poly(3-decylthiophene) (PDT) and poly(3-dodecylthiophene) (PDDT) has been measured under hydrostatic pressure up to 6 kbar as a function of FeCl3 doping. In all cases conductivity increased with pressure. The increase depends on the ambient pressure conductivity and side chain length. A maximum in the pressure dependence was found in the low conductivity region. With increasing side chain length, the pressure dependence increased and its maximum shifted to higher conductivity. At dilute doping levels Kivelson's theory for intersoliton hopping was applied. The three-dimensional variable range hopping model was used in the intermediate doping region. The Kivelson theory was applied to give numerical values for the bulk compressibility ranging from 2 × 10−10 m2/N (POT) to 6 × 10−10 m2/N (PDDT). In the metallic region the measured pressure effect on conductivity is small and less dependent on the side chain length.
Original languageEnglish
Pages (from-to)313-323
Number of pages11
JournalSynthetic Metals
Volume48
Issue number3
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

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pressure dependence
conductivity
Chain length
Doping (additives)
low conductivity
Pressure effects
Hydrostatic pressure
pressure effects
Compressibility
hydrostatic pressure
compressibility

Cite this

Isotalo, Heikki ; Ahlskog, Markus ; Stubb, Henrik. / Pressure dependence of d.c. conductivity in poly(3-alkylthiophenes). In: Synthetic Metals. 1992 ; Vol. 48, No. 3. pp. 313-323.
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abstract = "Pressure dependence of d.c. conductivity of poly(3-octylthiophene) (POT), poly(3-decylthiophene) (PDT) and poly(3-dodecylthiophene) (PDDT) has been measured under hydrostatic pressure up to 6 kbar as a function of FeCl3 doping. In all cases conductivity increased with pressure. The increase depends on the ambient pressure conductivity and side chain length. A maximum in the pressure dependence was found in the low conductivity region. With increasing side chain length, the pressure dependence increased and its maximum shifted to higher conductivity. At dilute doping levels Kivelson's theory for intersoliton hopping was applied. The three-dimensional variable range hopping model was used in the intermediate doping region. The Kivelson theory was applied to give numerical values for the bulk compressibility ranging from 2 × 10−10 m2/N (POT) to 6 × 10−10 m2/N (PDDT). In the metallic region the measured pressure effect on conductivity is small and less dependent on the side chain length.",
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Pressure dependence of d.c. conductivity in poly(3-alkylthiophenes). / Isotalo, Heikki; Ahlskog, Markus; Stubb, Henrik.

In: Synthetic Metals, Vol. 48, No. 3, 1992, p. 313-323.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Pressure dependence of d.c. conductivity in poly(3-alkylthiophenes)

AU - Isotalo, Heikki

AU - Ahlskog, Markus

AU - Stubb, Henrik

N1 - Project code: PUO2020

PY - 1992

Y1 - 1992

N2 - Pressure dependence of d.c. conductivity of poly(3-octylthiophene) (POT), poly(3-decylthiophene) (PDT) and poly(3-dodecylthiophene) (PDDT) has been measured under hydrostatic pressure up to 6 kbar as a function of FeCl3 doping. In all cases conductivity increased with pressure. The increase depends on the ambient pressure conductivity and side chain length. A maximum in the pressure dependence was found in the low conductivity region. With increasing side chain length, the pressure dependence increased and its maximum shifted to higher conductivity. At dilute doping levels Kivelson's theory for intersoliton hopping was applied. The three-dimensional variable range hopping model was used in the intermediate doping region. The Kivelson theory was applied to give numerical values for the bulk compressibility ranging from 2 × 10−10 m2/N (POT) to 6 × 10−10 m2/N (PDDT). In the metallic region the measured pressure effect on conductivity is small and less dependent on the side chain length.

AB - Pressure dependence of d.c. conductivity of poly(3-octylthiophene) (POT), poly(3-decylthiophene) (PDT) and poly(3-dodecylthiophene) (PDDT) has been measured under hydrostatic pressure up to 6 kbar as a function of FeCl3 doping. In all cases conductivity increased with pressure. The increase depends on the ambient pressure conductivity and side chain length. A maximum in the pressure dependence was found in the low conductivity region. With increasing side chain length, the pressure dependence increased and its maximum shifted to higher conductivity. At dilute doping levels Kivelson's theory for intersoliton hopping was applied. The three-dimensional variable range hopping model was used in the intermediate doping region. The Kivelson theory was applied to give numerical values for the bulk compressibility ranging from 2 × 10−10 m2/N (POT) to 6 × 10−10 m2/N (PDDT). In the metallic region the measured pressure effect on conductivity is small and less dependent on the side chain length.

U2 - 10.1016/0379-6779(92)90234-A

DO - 10.1016/0379-6779(92)90234-A

M3 - Article

VL - 48

SP - 313

EP - 323

JO - Synthetic Metals

JF - Synthetic Metals

SN - 0379-6779

IS - 3

ER -