Temperature dependence of DC-conductivity in poly(3-alkylthiophenes) in temperature regime 20-400 K

Kimmo Väkiparta, J. Moulton, A. Heeger, P. Smith, Heikki Isotalo, Henrik Stubb

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Abstract

We present recent results on the effect of side chain length and thermal dedoping on the temperature dependence of the conductivity above room temperature. The temperature dependence of the dc-conductivity in heavily doped poly(3-alkylthiophenes) changes above room temperature: instead of increasing with increased temperature, as at low temperatures, the conductivity decreases after reaching a maximum between 300 and 370 K. This effect is not due to thermal dedoping, which should be an irreversible process (or at least a function of both time and temperature). We propose that this maximum is caused by the disorder resulting from the thermochromic transition. Below 300 K the temperature dependence is in good agreement with thermal fluctuation induced tunneling model (σ=σexp(-T1(T0+T)). We will discuss the anisotropy of conductivity in stretched samples in low temperature.
Original languageEnglish
Pages (from-to)903 - 906
Number of pages4
JournalSynthetic Metals
Volume41
Issue number3
DOIs
Publication statusPublished - 1991
MoE publication typeA1 Journal article-refereed

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direct current
conductivity
temperature dependence
Temperature
irreversible processes
temperature
room temperature
disorders
anisotropy
Chain length
Anisotropy
Hot Temperature

Cite this

Väkiparta, K., Moulton, J., Heeger, A., Smith, P., Isotalo, H., & Stubb, H. (1991). Temperature dependence of DC-conductivity in poly(3-alkylthiophenes) in temperature regime 20-400 K. Synthetic Metals, 41(3), 903 - 906. https://doi.org/10.1016/0379-6779(91)91523-D
Väkiparta, Kimmo ; Moulton, J. ; Heeger, A. ; Smith, P. ; Isotalo, Heikki ; Stubb, Henrik. / Temperature dependence of DC-conductivity in poly(3-alkylthiophenes) in temperature regime 20-400 K. In: Synthetic Metals. 1991 ; Vol. 41, No. 3. pp. 903 - 906.
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abstract = "We present recent results on the effect of side chain length and thermal dedoping on the temperature dependence of the conductivity above room temperature. The temperature dependence of the dc-conductivity in heavily doped poly(3-alkylthiophenes) changes above room temperature: instead of increasing with increased temperature, as at low temperatures, the conductivity decreases after reaching a maximum between 300 and 370 K. This effect is not due to thermal dedoping, which should be an irreversible process (or at least a function of both time and temperature). We propose that this maximum is caused by the disorder resulting from the thermochromic transition. Below 300 K the temperature dependence is in good agreement with thermal fluctuation induced tunneling model (σ=σ∞exp(-T1(T0+T)). We will discuss the anisotropy of conductivity in stretched samples in low temperature.",
author = "Kimmo V{\"a}kiparta and J. Moulton and A. Heeger and P. Smith and Heikki Isotalo and Henrik Stubb",
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Väkiparta, K, Moulton, J, Heeger, A, Smith, P, Isotalo, H & Stubb, H 1991, 'Temperature dependence of DC-conductivity in poly(3-alkylthiophenes) in temperature regime 20-400 K', Synthetic Metals, vol. 41, no. 3, pp. 903 - 906. https://doi.org/10.1016/0379-6779(91)91523-D

Temperature dependence of DC-conductivity in poly(3-alkylthiophenes) in temperature regime 20-400 K. / Väkiparta, Kimmo; Moulton, J.; Heeger, A.; Smith, P.; Isotalo, Heikki; Stubb, Henrik.

In: Synthetic Metals, Vol. 41, No. 3, 1991, p. 903 - 906.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Temperature dependence of DC-conductivity in poly(3-alkylthiophenes) in temperature regime 20-400 K

AU - Väkiparta, Kimmo

AU - Moulton, J.

AU - Heeger, A.

AU - Smith, P.

AU - Isotalo, Heikki

AU - Stubb, Henrik

N1 - Project code: puo0011

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N2 - We present recent results on the effect of side chain length and thermal dedoping on the temperature dependence of the conductivity above room temperature. The temperature dependence of the dc-conductivity in heavily doped poly(3-alkylthiophenes) changes above room temperature: instead of increasing with increased temperature, as at low temperatures, the conductivity decreases after reaching a maximum between 300 and 370 K. This effect is not due to thermal dedoping, which should be an irreversible process (or at least a function of both time and temperature). We propose that this maximum is caused by the disorder resulting from the thermochromic transition. Below 300 K the temperature dependence is in good agreement with thermal fluctuation induced tunneling model (σ=σ∞exp(-T1(T0+T)). We will discuss the anisotropy of conductivity in stretched samples in low temperature.

AB - We present recent results on the effect of side chain length and thermal dedoping on the temperature dependence of the conductivity above room temperature. The temperature dependence of the dc-conductivity in heavily doped poly(3-alkylthiophenes) changes above room temperature: instead of increasing with increased temperature, as at low temperatures, the conductivity decreases after reaching a maximum between 300 and 370 K. This effect is not due to thermal dedoping, which should be an irreversible process (or at least a function of both time and temperature). We propose that this maximum is caused by the disorder resulting from the thermochromic transition. Below 300 K the temperature dependence is in good agreement with thermal fluctuation induced tunneling model (σ=σ∞exp(-T1(T0+T)). We will discuss the anisotropy of conductivity in stretched samples in low temperature.

U2 - 10.1016/0379-6779(91)91523-D

DO - 10.1016/0379-6779(91)91523-D

M3 - Article

VL - 41

SP - 903

EP - 906

JO - Synthetic Metals

JF - Synthetic Metals

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