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.
Original language | English |
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Pages (from-to) | 903 - 906 |
Number of pages | 4 |
Journal | Synthetic Metals |
Volume | 41 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1991 |
MoE publication type | A1 Journal article-refereed |