Enhanced photocurrent response in photocells made with platinum-poly-yne/C60 blends by photoinduced electron transfer

A. Köhler, H. F. Wittmann, R. H. Friend, M. S. Khan, J. Lewis

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

We report photocurrent and photoluminescence measurements on blends of the organometallic polymer Pt-poly-yne and C60. Due to efficient intersystem crossing, triplet excitons with a binding energy of at least 0.8 eV are created after photoexcitation of Pt-poly-yne. We find that electrons are transferred from Pt-poly-yne onto C60 by efficient ionization of the triplet exciton. This process gives rise to a photocurrent quantum yield of up to 1-2% in photocells fabricated in a layer structure of indium-tin oxide (ITO)/Pt-poly-yne and 7 wt.% C60/aluminium. Evidence for the ionization of the strongly bound triplet excitons is provided by studies of luminescence in the blends. There is only partial quenching of the singlet emission band, but complete quenching of the triplet emission band, and the lifetime of the triplet emission at room temperature is reduced from 2 to 0.1 μs upon addition of 7 wt.% C60.

Original languageEnglish
Pages (from-to)147-150
Number of pages4
JournalSynthetic Metals
Volume77
Issue number1-3
DOIs
Publication statusPublished - Feb 1996

Fingerprint

Photoelectric cells
photoelectric cells
Platinum
Photocurrents
Excitons
photocurrents
electron transfer
platinum
excitons
Ionization
Electrons
Quenching
organometallic polymers
quenching
ionization
Photoexcitation
Organometallics
Quantum yield
Tin oxides
Binding energy

Keywords

  • Blends
  • Fullerene
  • Photocells
  • Photocurrent
  • Platinum

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Enhanced photocurrent response in photocells made with platinum-poly-yne/C60 blends by photoinduced electron transfer. / Köhler, A.; Wittmann, H. F.; Friend, R. H.; Khan, M. S.; Lewis, J.

In: Synthetic Metals, Vol. 77, No. 1-3, 02.1996, p. 147-150.

Research output: Contribution to journalArticle

Köhler, A. ; Wittmann, H. F. ; Friend, R. H. ; Khan, M. S. ; Lewis, J. / Enhanced photocurrent response in photocells made with platinum-poly-yne/C60 blends by photoinduced electron transfer. In: Synthetic Metals. 1996 ; Vol. 77, No. 1-3. pp. 147-150.
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N2 - We report photocurrent and photoluminescence measurements on blends of the organometallic polymer Pt-poly-yne and C60. Due to efficient intersystem crossing, triplet excitons with a binding energy of at least 0.8 eV are created after photoexcitation of Pt-poly-yne. We find that electrons are transferred from Pt-poly-yne onto C60 by efficient ionization of the triplet exciton. This process gives rise to a photocurrent quantum yield of up to 1-2% in photocells fabricated in a layer structure of indium-tin oxide (ITO)/Pt-poly-yne and 7 wt.% C60/aluminium. Evidence for the ionization of the strongly bound triplet excitons is provided by studies of luminescence in the blends. There is only partial quenching of the singlet emission band, but complete quenching of the triplet emission band, and the lifetime of the triplet emission at room temperature is reduced from 2 to 0.1 μs upon addition of 7 wt.% C60.

AB - We report photocurrent and photoluminescence measurements on blends of the organometallic polymer Pt-poly-yne and C60. Due to efficient intersystem crossing, triplet excitons with a binding energy of at least 0.8 eV are created after photoexcitation of Pt-poly-yne. We find that electrons are transferred from Pt-poly-yne onto C60 by efficient ionization of the triplet exciton. This process gives rise to a photocurrent quantum yield of up to 1-2% in photocells fabricated in a layer structure of indium-tin oxide (ITO)/Pt-poly-yne and 7 wt.% C60/aluminium. Evidence for the ionization of the strongly bound triplet excitons is provided by studies of luminescence in the blends. There is only partial quenching of the singlet emission band, but complete quenching of the triplet emission band, and the lifetime of the triplet emission at room temperature is reduced from 2 to 0.1 μs upon addition of 7 wt.% C60.

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