Barra, Mario and Cassinese, Antonio and D'Angelo, Pasquale and Carella, Antonio and Roviello, Antonio (2007) Direct current and alternating current electrical transport properties of regioregular poly[3-(4-alkoxyphenyl)-thiophenes]. [Pubblicazione in rivista scientifica]

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Tipologia del documento: Pubblicazione in rivista scientifica
Lingua: English
Titolo: Direct current and alternating current electrical transport properties of regioregular poly[3-(4-alkoxyphenyl)-thiophenes].
Autori:
AutoreEmail
Barra, Mario[non definito]
Cassinese, Antonio[non definito]
D'Angelo, Pasquale[non definito]
Carella, Antonio[non definito]
Roviello, Antonio[non definito]
Autore/i: M. Barra, M. Biasiucci, A. Cassinese, P. D'Angelo, AC. Barone, A. Carella, A. Roviello
Data: 2007
Numero di pagine: 8
Dipartimento: Scienze fisiche
Titolo del periodico: JOURNAL OF APPLIED PHYSICS
Data: 2007
Volume: 102(9)
Numero: 9
Intervallo di pagine: 093712/1-093712/7
Numero di pagine: 8
Parole chiave: regioregular, electrical transport properties, polymers
Depositato il: 20 Ott 2010 08:34
Ultima modifica: 30 Apr 2014 19:42
URI: http://www.fedoa.unina.it/id/eprint/6743

Abstract

In this paper, the d.c. and a.c. (ac) elec. transport properties of doped and undoped regioregular poly[3-(4-alkoxyphenyl)-thiophenes], where the alkoxy groups are O-(CH2)n-1CH3 with n = 1,4,6, and 8, have been investigated. The films have been synthesized by an exptl. procedure based on the oxidn. of 3-(4-alkoxyphenyl)-thiophenes with mol. oxygen in presence of VO(acac)2, as the catalyst. Unlike other examples reported in the literature, this approach allows obtaining well structured spin-coated films without the necessity of further processes, such as annealing or exposition to solvent vapors. D.c.-voltage measurements, performed in planar and transverse configuration on 1 m thick films, show both ohmic and space charge limited current behavior, at low and high applied fields, resp. Due to the film ordered structure, a significant elec. anisotropy was found. In order to deeply investigate the basic conduction mechanisms, ac measurements have been also carried out in the frequency range between 100 Hz and 100 kHz. Finally, d.c. and a.c. cond. temp. dependence is discussed in the framework of thermally activated hopping and tunneling models.

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