[PDF]    http://dx.doi.org/10.3952/lithjphys.45209

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 45, 133–137 (2005)


NONLINEAR I–V CHARACTERISTICS IN POLYANILINE DUE TO PHONON-ASSISTED TUNNELLING
A. Kiveris and P. Pipinys
Department of Physics, Vilnius Pedagogical University, Studentų 39, LT- 08106 Vilnius, Lithuania
E-mail: studsk@vpu.lt

Received 11 April 2005

Non-linear temperature-dependent current–voltage (I–V) characteristics of an organic polyaniline (PAN) thin films diodes measured by Kieffel et al. (Synth. Met. 135–136, 325–326 (2003)) is explained on the basis of phonon-assisted tunnelling initiated by electrical field. The results of temperature dependence of conductivity in PAN films presented in references: Gosh et al., Phys. Lett. A 260, 138–148 (1999), Mzenda et al., Synth. Met. 127, 285–289 (2002), and Maser et al., Mater. Sci. Engin. C 23, 87–91 (2003) are also explained on the basis of the free charge carrier generation tunnelling mechanism. From the fit of the experimental data with the present model the density of localised states which take part in the current flow is estimated.
Keywords: polyaniline, current–voltage characteristics, phonon-assisted tunnelling
PACS: 72.10.Di, 73.61.Ph, 73.40.Gk


POLIANILINO VOLTAMPERINIŲ PRIKLAUSOMYBIŲ NETIESIŠKUMAS FONONAIS PASKATINTŲ TUNELINIŲ ŠUOLIŲ POŽIŪRIU
A. Kiveris, P. Pipinys
Vilniaus pedagoginis universitetas, Vilnius, Lietuva

Netiesinės polianilino plonų plėvelių voltamperinių charakteristikų temperatūrinės priklausomybės (eksperimentiniai autorių duomenys iš [1, 7, 8, 14]) palygintos su teorinėmis krūvininkų tunelinių šuolių dalyvaujant fononams tikimybių priklausomybėmis nuo temperatūros ir elektrinio lauko stiprio. Eksperimento duomenys gerai atitinka apskaičiuotas tuneliavimo spartos priklausomybes nuo lauko stiprio ir temperatūros. Palyginus eksperimentinius duomenis su teorinėmis priklausomybėmis rastas paviršinis srovę sąlygojančių lokalizuotų centrų tankis, lygus ≈1016 m−2.


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