Low temperature thermally stimulated current characterization of nanoporous TiO2 films. Issue 8 (25th April 2014)

• Record Type: Journal Article
• Authors: Bruzzi, Mara; Mori, Riccardo; Carnevale, Ennio; Scaringella, Monica; Bogani, Franco
• Is Part Of: Physica status solidi. Volume 211:Issue 8(2014:Aug.)
• Page Start: 1691
• Page End: 1697
• Publication Date: 2014-04-25
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201330608
• Languages: English
• ISSNs: 1862-6300

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssa201330608-sec-0001" sec-type="section"> <p>Nanoporous films of TiO₂ have been obtained by deposition on an alumina substrate of a commercial colloid and Au contacts have been put on surface for in‐plane conductivity measurements. Samples have been characterized by means of a series of sequential thermally stimulated currents scans, from nearly liquid He temperature up to 200 K, in order to get information on: conduction mechanisms, distribution of intragap density of states and recombination times of free an localized carriers. A model for hopping conductivity has been considered to properly take into account of localized states filling; it has been used to fit the experimental data, without a‐priori assumptions on the nature of the conduction mechanisms. It is found that hopping conductivity prevails over free‐carrier, in quasi‐equilibrium regime, in the investigated temperature range.</p> </sec> </abstract>