Conductivity studies of nanostructured TiO2 films permeated with electrolyte
2004 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, 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 (similar to1-20 electrons per TiO2 particle), the effective electron mobility is dependent on the electron concentration and values between 7 x 10(-4) and 78 x 10(-4) cm(2) V-1 s(-1) were determined. The activation energy of the mobility was similar to0.3 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 similar to150 x 10(-4) cm(2) 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.
nanocrystalline photovoltaic cells, solar-cells, charge-transfer, back-reaction, transport, conversion, nanoparticulate, efficiency, impedance, kinetics
IdentifiersURN: urn:nbn:se:kth:diva-23649DOI: 10.1021/jp037119pISI: 000223289500019OAI: oai:DiVA.org:kth-23649DiVA: diva2:342348
QC 201005252010-08-102010-08-10Bibliographically approved