AC conductivity of unoxydized tetrathiafulvalene (TTF) polymer thin films

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Abstract
This new class of pendant group polymeric coatings has been of interest in obtaining stable electroactive surfaces. To understand the electronic conduction mechanism within the polymer, wide frequency (10−3–106 Hz) and temperature (2.6–316 K) range admittance measurements were carried out in a sealed cryogenic vacuum chamber. Submicron thick samples were spun onto e-beam evaporated platinum, with a gold or other metal counterelectrode. Low field results indicate a power law frequency dependence of both the conductance and capacitance parts of the admittance, giving a frequency independent phase angle similar to some other systems. The power law exponent is temperature dependent, approaching 1 as the temperature decreases to 0. The data support a model by Pike based on classical hopping over barriers with a height distribution caused by random spatial site distribution. The dc conductivity has an activation energy of 0.53 eV and exhibits a Poole–Frenkel dependence at high fields.

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