In‐situ Apparent Mobility of Charge Carriers in Polyaniline Films Measured with a New Four‐band Electrode

Abstract

The in-situ apparent mobility in polyaniline films was accurately measured in a wide doping region using a new four-band electrode. It was found the apparent mobility in polyaniline films rises with increasing the doping level or carrier density. The influence of film thickness on the conductivity and apparent mobility of charge carriers was also investigated. The relative higher conductivity observed in a thinner film under low and intermediate doping potentials is assigned to the higher inter-chain mobility related to the more ordered structure of the film. The mobility variations provide experimental evidence to confirm the inter-chain path for hopping transport of polarons and the intra-chain path for evolution of metallic conduction.