Abstract
Electrical conductivity and thermoelectric power (TEP) of poly (2-Butoxy-5-Methoxy-1, 4-Phenylene Vinylene) films doped with iodine and FeCl 3 are investigated. The FeCl 3 doped film stretched to 2.0 times its original length shows maximum conductivity σ ∥ (RT) = 5.7×10 2 S/cm along the stretched direction. The anisotropy at room temperature for this sample is σ ∥/ σ ⊥ = 50 and it increases upon cooling indicating that the interchain hopping conduction is important. The room temperature TEP value varies with the dopant concentrations but it is independent of the stretching ratios. Temperature dependence of TEP is quasi-linear for all doped samples characteristic to be metallic. The change of ionization potential due to the substituted rings on PPV chain seems to be the origin for the conductivity enhancement when the polymer is doped.
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