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A study of electron transfer in Ru(dcbpy)(2)(NCS)(2) sensitized nanocrystalline TiO2 and SnO2 films induced by red-wing excitation

Myllyperkio, Pasi LU ; Benko, Gabor LU ; Korppi-Tommola, Jouko; Yartsev, Arkady LU and Sundström, Villy LU (2008) In Physical Chemistry Chemical Physics 10(7). p.996-1002
Abstract
Excited state dynamics and electron transfer from the Ru(dcbpy)(2)(NCS)(2) (RuN3) sensitizer to semiconductor nanoparticles were studied using time-resolved femtosecond absorption spectroscopy. We found that excitation of the red wing of the absorption spectrum of the sensitizer populates the (MLCT)-M-3 state directly, both in solution and attached on semiconductor nanoparticle films. Electron injection is slowed down and becomes gradually less efficient as excitation moves towards red from the absorption maximum at 535 nm. At 675 nm the injection is non-exponential and characterized by 5, 30 and 180 ps time constants. The non-exponential electron injection observed is assigned to injection from a distribution of triplet states with... (More)
Excited state dynamics and electron transfer from the Ru(dcbpy)(2)(NCS)(2) (RuN3) sensitizer to semiconductor nanoparticles were studied using time-resolved femtosecond absorption spectroscopy. We found that excitation of the red wing of the absorption spectrum of the sensitizer populates the (MLCT)-M-3 state directly, both in solution and attached on semiconductor nanoparticle films. Electron injection is slowed down and becomes gradually less efficient as excitation moves towards red from the absorption maximum at 535 nm. At 675 nm the injection is non-exponential and characterized by 5, 30 and 180 ps time constants. The non-exponential electron injection observed is assigned to injection from a distribution of triplet states with energies below the semiconductor conduction band edge. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
10
issue
7
pages
996 - 1002
publisher
Royal Society of Chemistry
external identifiers
  • wos:000253013800009
  • scopus:38949214684
ISSN
1463-9084
DOI
10.1039/b713515g
language
English
LU publication?
yes
id
1bc13bd4-849c-4880-90fd-7f16fa2ac219 (old id 1198538)
date added to LUP
2008-09-10 14:41:22
date last changed
2017-09-03 04:10:56
@article{1bc13bd4-849c-4880-90fd-7f16fa2ac219,
  abstract     = {Excited state dynamics and electron transfer from the Ru(dcbpy)(2)(NCS)(2) (RuN3) sensitizer to semiconductor nanoparticles were studied using time-resolved femtosecond absorption spectroscopy. We found that excitation of the red wing of the absorption spectrum of the sensitizer populates the (MLCT)-M-3 state directly, both in solution and attached on semiconductor nanoparticle films. Electron injection is slowed down and becomes gradually less efficient as excitation moves towards red from the absorption maximum at 535 nm. At 675 nm the injection is non-exponential and characterized by 5, 30 and 180 ps time constants. The non-exponential electron injection observed is assigned to injection from a distribution of triplet states with energies below the semiconductor conduction band edge.},
  author       = {Myllyperkio, Pasi and Benko, Gabor and Korppi-Tommola, Jouko and Yartsev, Arkady and Sundström, Villy},
  issn         = {1463-9084},
  language     = {eng},
  number       = {7},
  pages        = {996--1002},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {A study of electron transfer in Ru(dcbpy)(2)(NCS)(2) sensitized nanocrystalline TiO2 and SnO2 films induced by red-wing excitation},
  url          = {http://dx.doi.org/10.1039/b713515g},
  volume       = {10},
  year         = {2008},
}