Abstract
Deviations from Ohm's law are reported for electrical conduction in thin films of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS). A bridge method is used with two independent currents: a `pump' current flowing through mainly one resistive part and a small `probe' current. Changes in resistance are independent of the probe current, but linearly proportional to the electrical power delivered by the pump current. The change in resistance is interpreted in terms of Joule heating and a constant relating the relative change in resistance to the heat production is extracted: αs=8×10−8 √s cm3/J.
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