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

Fingerprint

Thermoelectric power
Polyaniline
conductivity
Temperature
Conductive films
room temperature
Thin film transistors
Self assembly
self assembly
Polymers
transistors
Vacuum
conduction
vacuum
temperature dependence
polyaniline
air
polymers
thin films
Air

Cite this

Paloheimo, Jari ; Laakso, Kaarina ; Isotalo, Heikki ; Stubb, Henrik. / Thermoelectric power and field-effect mobility in self-assembled films of poly- and oligoanilines. In: Synthetic Metals. 1995 ; Vol. 68, No. 3. pp. 249-257.
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Thermoelectric power and field-effect mobility in self-assembled films of poly- and oligoanilines. / Paloheimo, Jari; Laakso, Kaarina; Isotalo, Heikki; Stubb, Henrik.

In: Synthetic Metals, Vol. 68, No. 3, 1995, p. 249-257.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Thermoelectric power and field-effect mobility in self-assembled films of poly- and oligoanilines

AU - Paloheimo, Jari

AU - Laakso, Kaarina

AU - Isotalo, Heikki

AU - Stubb, Henrik

PY - 1995

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AB - 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.

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