Polaronic transport in TiO 2 thin films with increasing Nb content

YILDIZ A., Mardare D.

Philosophical Magazine, vol.91, no.34, pp.4401-4409, 2011 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 91 Issue: 34
  • Publication Date: 2011
  • Doi Number: 10.1080/14786435.2011.623143
  • Journal Name: Philosophical Magazine
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4401-4409
  • Keywords: Electrical transport, Small polaron hopping model, Thin films, Titanium oxide
  • Ankara Yıldırım Beyazıt University Affiliated: Yes

Abstract

The temperature dependence of the charge transport in TiO 2 films was investigated to establish the correlation between the Nb content and electrical properties. It was identified that temperature-dependent conductivity of the films is dominated by a phonon-assisted small polaron hopping model in the non-adiabatic regime. Applying the polaron hopping models of Mott, Schnakenberg and Emin to describe the observed behavior, temperature-dependent conductivity data of the films were analyzed. A detailed analysis in terms of small polaron hopping parameters in the investigated temperature regime was used to correlate electrical properties with the percentage of Nb. © 2011 Taylor & Francis.