To access the full text documents, please follow this link: http://hdl.handle.net/2117/24430

Title:	Hopping conductivity and polarization effects in a fullerene derivative salt
Author:	Macovez, Roberto; Zachariah, Manesh; Romanini, Michela; Zygouri, Panagiota; Gournis, Dimitrios; Tamarit Mur, José Luis
Other authors:	Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
Abstract:	Impedance spectroscopy is employed to probe the frequency-dependent conductivity and dielectric response of the C60O24Na 24 fulleride. The conduction properties of this organic material match the so-called universal behavior of the ac conductivity in disordered media [Dyre, J. C.; Schroder, T. B. Rev. Mod. Phys. 2000, 72, 873-892]. In the whole temperature range studied, electrical conduction is due to intermolecular hopping processes of electronic charge carriers, characterized by an effective activation energy ranging between 0.7 eV at room temperature and 0.9 eV at 475 K. A single dielectric loss feature is observed, associated with the hopping of charge carriers surrounded by a polarization cloud. The polarizability of the material is mainly due to the distortion of the ionic O-Na bonds of the fullerene derivative, which are tight enough that no ionic contribution to the conductivity is observed up to the highest temperature probed (550 K). © 2014 American Chemical Society.
Subject(s):	-Àrees temàtiques de la UPC::Energies::Energia elèctrica -Àrees temàtiques de la UPC::Enginyeria dels materials::Materials funcionals -Spectrum analysis -Nanotechnology -Conduction properties -Effective activation energy -Electrical conduction -Frequency dependent conductivity -Fullerene derivative -Hopping conductivity -Impedance spectroscopy -Intermolecular hopping -Espectroscopis -Nanotecnologia
Rights:	Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Document type:	Article - Published version Article
Share:

Show full item record