Abstract
A study of the transport properties of a polymer blend consisting of poly(3-octylthiophene) (POT) and ethylenevinylacetate doped with FeCl3 reveals a change in conductivity mechanism when the material is cross linked by electron irradiation. In heavily irradiated samples and in samples with a high POT content the temperature and the electric field dependences of the dc conductivity are in good agreement with the model of thermal-fluctuation-induced tunneling between metallic particles embedded in a dielectric matrix. In unirradiated samples with a low POT content, however, the data fit best the model of charging-energy-limited tunneling of a granular polymeric metal. These transport properties indicate an increase in the average size of the conducting particles as the polymer blend is cross linked.
Original language | English |
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Pages (from-to) | 5914-5918 |
Journal | Physical Review B: Condensed Matter |
Volume | 41 |
Issue number | 9 |
DOIs | |
Publication status | Published - 1990 |
MoE publication type | A1 Journal article-refereed |