Role of side groups in pyridine and bipyridine ruthenium dye complexes for modulated surface photovoltage in nanoporous TiO2


Sahin Ç., Dittrich T., Varlikli C., Icli S., Lux-Steiner M. C.

SOLAR ENERGY MATERIALS AND SOLAR CELLS, vol.94, no.4, pp.686-690, 2010 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 94 Issue: 4
  • Publication Date: 2010
  • Doi Number: 10.1016/j.solmat.2009.11.008
  • Journal Name: SOLAR ENERGY MATERIALS AND SOLAR CELLS
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.686-690
  • Keywords: Ruthenium (II) complex, Surface photovoltage spectroscopy, Electron backtransfer, Titanium dioxide, NANOCRYSTALLINE TIO2, SENSITIZATION, LIGHT

Abstract

The influence of molecular side groups on the electron backtransfer into ruthenium-dye molecules adsorbed on ultra-thin nanoporous TiO2 layers has been investigated by modulated surface photovoltage spectroscopy in argon atmosphere. All ruthenium-dye molecules contained one bipyridine (bpy) ligand with two carboxylic groups for anchoring at the TiO2 surface. Ruthenium (II) complexes with a second bpy ligand with branching and non-branching side groups containing C and H only and ruthenium (II) complexes with a second pyridine (py) ligand with side groups containing different numbers of -C-O-C- sequences were synthesized. The electron backtransfer was practically not affected by branching or non-branching side groups in the bpy-bpy complexes. In contrast, electron backtransfer was much less for bpy-py complexes in comparison to bpy-bpy complexes and increased strongly with increasing number of -C-O-C- sequences in the side groups. (C) 2009 Elsevier B.V. All rights reserved.