Abstract
A series of cobalt-containing redox couples, based on [Co(1, 10-phenanthroline)3](ClO4)2 and its derivatives, were prepared for use as regenerators/shuttles in dye-sensitized solar cells featuring modified TiO2 photoelectrodes. Surface modification and trap-state passivation of the TiO2 nanoparticle film electrodes were accomplished via atomic layer deposition of an ultrathin alumina coating. Electron lifetimes were then extracted from open-circuit voltage decay measurements. Cells employing alumina barrier/passivation layers exhibited higher open-circuit voltages as shuttles with more positive redox potentials were used, with the Co(5-nitro-phen)33+/2+ couple exhibiting the highest V∞ (0.844 V). Analysis of the open-circuit voltages and electron lifetimes indicate Marcus normal-region behavior for back electron transfer from the TiO2 photoanode to these compounds.
Original language | English |
---|---|
Pages (from-to) | 9082-9087 |
Number of pages | 6 |
Journal | Langmuir |
Volume | 26 |
Issue number | 11 |
DOIs | |
Publication status | Published - Jun 1 2010 |
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Spectroscopy
- Electrochemistry