Organic solar cells with sensitized phosphorescent absorbing layers

Barry P. Rand, Sarah Schols, David Cheyns, Hans Gommans, Claudio Girotto, Jan Genoe, Paul Heremans, Jef Poortmans

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

We demonstrate an increase of the exciton diffusion length (LD) of a fluorescent donor layer via the process of sensitized phosphorescence, whereby initially generated singlet excitons are transferred to triplet excitons via a properly chosen dopant molecule. Using a poly(p-phenylene vinylene) host doped with the phosphorescent molecule platinum octaethylporphyrin, LD increases from 4 ± 1 to 9 ± 1 nm for an optimal doping of 5 wt%. As a result of the increased LD, the photocurrent from the doped layer increases by 40%. By doping with the fluorescent, non-metalated analogue octaethylporphyrin, a reduction in photocurrent is shown, providing further evidence of the sensitized phosphorescence mechanism.

Original languageEnglish (US)
Pages (from-to)1015-1019
Number of pages5
JournalOrganic Electronics
Volume10
Issue number5
DOIs
StatePublished - Aug 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Keywords

  • 31.50.Df
  • 72.80.Le
  • 84.60.Jt
  • Excition diffusion length
  • Organic photovoltaic cells
  • Sensitized phosphorescence

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