Abstract
In this paper, we have shown that the sign inversion of photocarrier in a fusible conjugated polymer, regiorandom poly(3-octadecylthiophene) associated with the solid-liquid phase transition. The transient photocurrent by hole is clearly observed in the solid state, while it weakens to be below the noise level in the liquid state. On the other hand, the transient photocurrent by a negative carrier can be clearly observed not in the solid state but in the liquid state. The mobility has been found in a narrow range from 10-6 to 10-5 cm2/V·s for both positive and negative carriers, except for the temperature near the melting point. This indicates not only that the photocarrier in the liquid state is not ionic but electronic one, but also that the same mechanism, i.e. interchain hopping of carrier, dominantly limits their transport. The drastic conformational change of polymer backbone induced by the thermal activation of side chain vibration, which is responsible for the thermochromism in poly(3-alkylthiophene)s, may play a key role for this unique phenomenon.
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