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Thermoelectric Power in Inhomogeneous Metallic Polymers
Author(s) -
Kuivalainen P.,
Isotalo H.,
Stubb H.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221220245
Subject(s) - seebeck coefficient , variable range hopping , polyacetylene , materials science , doping , condensed matter physics , thermoelectric effect , electrical resistivity and conductivity , thermal conduction , metal , conductive polymer , polymer , atmospheric temperature range , conductivity , polypyrrole , thermodynamics , optoelectronics , physics , composite material , quantum mechanics , metallurgy , polymerization
Abstract Thermoelectric power (TEP) in well conducting doped polymers is studied within a simple model in which the existence of metallic strands separated by thin potential barriers is assumed. It is shown that if the barriers dominate the dc electrical conductivity σ dc ( T ) leading to a variable range hopping (VRH) conduction, they also give rise to a sub‐linear behaviour of TEP vs. temperature. The model predicts an enhanced TEP at high temperatures. It also indicates that due to the barriers the evaluation of Mott's parameters for VRH from the measured σ dc ( T ) typically leads to incorrect values for, e.g., the density of states. The calculated TEP vs. temperature is compared with experimental data on heavily doped polyacetylene and polypyrrole.