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Charge transport in nanostructured TiO2 films permeated with an electrolyte was studied, using temp.-dependent cond. and electron accumulation measurements. Two regions for charge transport were distinguished from the relationship between cond. and electron concn. In the first region (∼1-20 electrons per TiO2 particle), the effective electron mobility is dependent on the electron concn. and values between 7 × 10-4 and 78 × 10-4 cm2 V-1 s-1 were detd. 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 concn. and values of ∼150 × 10-4 cm2 V-1 s-1 are calcd. 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.
Majed Chergui, Malte Oppermann, Lijie Wang
Giulia Tagliabue, Fateme Kiani Shahvandi, Alan Richard Bowman, Theodoros Tsoulos
Giulia Tagliabue, Fateme Kiani Shahvandi, Alan Richard Bowman, Theodoros Tsoulos