q-Gaussian analysis of the electronic behavior in polymethylmetacrylate

Abstract

The behavior of the electrical conductivity of polymethylmetacrylate (PMMA) thin films was examined with q-Gaussian analysis. To this effect, the time evolutions of Al-PMMA-Al thin films' transient current data when subjected to an electric field at 295 K, 303 K and 313 K temperatures were considered; and the fitted long tailed q-Gaussian curves of the probability density functions were compared with normal Gaussian distributions. The q-exponential fits are definitely in better agreement with the experimental data than the normal Gaussian distributions. Additionally, it was shown that when the temperature parameter increases, the q value decreases. To the extent that q values can be considered to indicate the degree of correlation in a system, this result confirms that when the q value decreases, the correlation among PMMA atoms declines. (C) 2013 Elsevier Ltd. All rights reserved.