Conductivity studies of nanostructured TiO2 films permeated with electrolyte
2004 (English)In: Journal of Physical Chemistry B, Vol. 108, no 33, 12388-12396 p.Article in journal (Refereed) Published
Charge transport in nanostructured TiO2 films permeated with an electrolyte was studied, using temperature-dependent conductivity and electron accumulation measurements. Two regions for charge transport were distinguished from the relationship between conductivity and electron concentration. In the first region (1−20 electrons per TiO2 particle), the effective electron mobility is dependent on the electron concentration and values between 7 × 10-4 and 78 × 10-4 cm2 V-1 s-1 were determined. The activation energy of the mobility was 0.3 eV. The charge transport can be described with a trapping/detrapping model that involves localized band-gap states. In the second region (> 20 electrons per TiO2 particle), the effective electron mobility is independent of electron concentration and values of 150 × 10-4 cm2 V-1 s-1 are calculated. The activation energy of mobility is in the range of 0−0.15 eV, depending on the electrolyte. Transport of electrons in the conduction band seems to be the most applicable model.
Place, publisher, year, edition, pages
2004. Vol. 108, no 33, 12388-12396 p.
IdentifiersURN: urn:nbn:se:uu:diva-91023DOI: 10.1021/jp037119pOAI: oai:DiVA.org:uu-91023DiVA: diva2:163591