Jump to main content
Jump to site search

Issue 34, 2017
Previous Article Next Article

Extending charge separation lifetime and distance in patterned dye-sensitized SnO2–TiO2 μm-thin films

Author affiliations

Abstract

A simple method for the preparation of patterned dye-sensitized SnO2–TiO2 thin films, designed to prolong the lifetime of the interfacial charge separated state is presented. Using microfluidic technology, the thin films were sensitized with the organic sensitizer D35 such that they contain SnO2–TiO2 areas with dye and SnO2 dye-free areas at which injected electrons can be accumulated. Single wavelength transient absorption spectroscopy confirmed significantly extended charge separation lifetime at the dye-semiconductor interface. Sufficiently high density of injected electrons results in substantial decrease of charge recombination rate constants (kcr); a factor of ∼50 compared to dye-sensitized TiO2 thin films and a factor of ∼2000 compared to dye-sensitized SnO2 thin films. Furthermore, the potential of this approach was confirmed by photoinduced conduction band mediated electron transfer from the dye to a model electron acceptor, Co protoporphyrin IX, which was adsorbed to the SnO2-only regions.

Graphical abstract: Extending charge separation lifetime and distance in patterned dye-sensitized SnO2–TiO2 μm-thin films

Back to tab navigation

Supplementary files

Publication details

The article was received on 04 Jul 2017, accepted on 10 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP04486K
Citation: Phys. Chem. Chem. Phys., 2017,19, 22684-22690
  •   Request permissions

    Extending charge separation lifetime and distance in patterned dye-sensitized SnO2–TiO2 μm-thin films

    V. Saavedra Becerril, E. Sundin, M. Mapar and M. Abrahamsson, Phys. Chem. Chem. Phys., 2017, 19, 22684
    DOI: 10.1039/C7CP04486K

Search articles by author

Spotlight

Advertisements