Extending charge separation lifetime and distance in patterned dye-sensitized SnO2–TiO2 µm-thin films
Journal article, 2017

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 B50 compared to dye-sensitized TiO2 thin films and a factor of B2000 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.

charge separation

thin films

SnO2

DSSC

TiO2

Author

Valeria Saavedra

Chalmers, Chemistry and Chemical Engineering

Elin Sundin

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry, Physical Chemistry

Mokhtar Mapar

Chalmers, Physics, Biological Physics

Maria Abrahamsson

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry, Physical Chemistry

Physical Chemistry Chemical Physics

1463-9076 (ISSN) 1463-9084 (eISSN)

Vol. 19 34 22684-22690

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Chemical Sciences

DOI

10.1039/c7cp04486k

PubMed

28812752

More information

Created

10/7/2017