Thermoelectric power and field-effect mobility in self-assembled films of poly- and oligoanilines

Jari Paloheimo, Kaarina Laakso, Heikki Isotalo, Henrik Stubb

Research output: Contribution to journalArticleScientificpeer-review

38 Citations (Scopus)

Abstract

Thin conducting films of polyanilines and oligoanilines were deposited by using a layer-by-layer self-assembly process. Conductivity, thermoelectric power and field-effect measurements were performed on the films. The highest conductivities were around 1 S cm−1 at room temperature. The conductivity was studied as a function of temperature and was found to obey the law of variable-range hopping. The thermoelectric power of the films was initially n-type in air at room temperature, but changed its sign to p-type under vacuum or with time. A linear temperature dependence was observed and related to the contribution from metallic polymer chain segments. The field effect, measured using thin film transistor structures, was always n-type and the field-effect mobilities about 10−6-10−3cm2 V−1 S−1. The Coulomb gap model gives a good description of the system still lacking an expression for the field effect.
Original languageEnglish
Pages (from-to)249-257
JournalSynthetic Metals
Volume68
Issue number3
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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