Photosensitized growth of TiO 2 nanoparticles improved the charge transfer dynamics of a bichromophoric dye

Hsuenli Chen, Jiannfong Lee, Saochin Tseng, Meihsiang Lin, Wenbin Liau

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Nanostructured TiO 2 particles utilized in dye-sensitized solar cells (DSSCs) provide a large surface area, which facilitates the adsorption of sensitizing dye and charge recombination due to the high density of surface traps. In this article, a modified surface of TiO 2 nanoparticles was successfully synthesized in the presence of (1-hydroxycyclohexyl)(phenyl) methanone (HCPM) as a sensitizer to control formation in a toluene/ethanol medium via a photolytic process. A particle-size analysis showed that the oxides which had fully oxidized to TiO 2 were 20∼35 nm in diameter. The structure of the TiO 2 particles being of an amorphous nature and the nearly defect-free distributions of Ti 4 and O 2- energy levels imply that the grain boundaries and surface trap sites were effectively suppressed. TiO 2 particles were subsequently blended with the bichromophoric dye, AMIP, to study fluorescence decay dynamics between AMIP/TiO 2 interfaces. Fluorescence lifetime measurements gave the rate constant for the charge-transfer process from the excited singlet of AMIP to the conduction band of TiO 2 as 1.2×10 9 s -l. When PL quenching measured as the TiO 2 contents of these composites reached a 2.5 wt% level, the maximum enhanced charge-transfer dynamics occurred. Structural properties and photophysical behaviors of composites of AMIP bound to TiO 2 were extensively demonstrated.

Original languageEnglish
Pages (from-to)2182-2187
Number of pages6
JournalJournal of Luminescence
Volume132
Issue number8
DOIs
Publication statusPublished - Aug 2012

Fingerprint

Nanoparticles
Charge transfer
Coloring Agents
dyes
charge transfer
nanoparticles
Growth
Fluorescence
Toluene
traps
Particle Size
sensitizing
fluorescence
Oxides
Genetic Recombination
Adsorption
composite materials
Composite materials
Ethanol
Conduction bands

Keywords

  • Charge-transfer process
  • Emission lifetime decay
  • Photosensitized growth of TiO
  • Surface states

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Chemistry(all)
  • Biochemistry
  • Biophysics

Cite this

Photosensitized growth of TiO 2 nanoparticles improved the charge transfer dynamics of a bichromophoric dye. / Chen, Hsuenli; Lee, Jiannfong; Tseng, Saochin; Lin, Meihsiang; Liau, Wenbin.

In: Journal of Luminescence, Vol. 132, No. 8, 08.2012, p. 2182-2187.

Research output: Contribution to journalArticle

Chen, Hsuenli ; Lee, Jiannfong ; Tseng, Saochin ; Lin, Meihsiang ; Liau, Wenbin. / Photosensitized growth of TiO 2 nanoparticles improved the charge transfer dynamics of a bichromophoric dye. In: Journal of Luminescence. 2012 ; Vol. 132, No. 8. pp. 2182-2187.
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