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Charge Transport in Thin Films of Polyaniline: Variable‐Range Hopping in a Parabolic Quasi‐Gap
Author(s) -
Granholm P.,
Paloheimo J.,
Stubb H.
Publication year - 1998
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/(sici)1521-3951(199801)205:1<315::aid-pssb315>3.0.co;2-7
Subject(s) - variable range hopping , polyaniline , condensed matter physics , coulomb , electric field , materials science , thin film , charge (physics) , range (aeronautics) , conductivity , electrical resistivity and conductivity , band gap , optoelectronics , nanotechnology , physics , thermal conduction , composite material , electron , quantum mechanics , polymer , polymerization
We report a study of charge transport in thin, conducting polyaniline films, fabricated by using the Langmuir‐Blodgett or layer‐by‐layer self‐assembly techniques. The conductivity was studied as a function of film thickness, temperature and electric field, all the results being consistent with theoretical models for variable‐range hopping in a parabolic quasi‐gap. Furthermore, the films showed a small n‐type field effect which can be simply explained by assuming that the parabolic quasi‐gap is a Coulomb gap.