• English
  • Deutsch
  • Log In
    Password Login
    Research Outputs
    Fundings & Projects
    Researchers
    Institutes
    Statistics
Repository logo
Fraunhofer-Gesellschaft
  1. Home
  2. Fraunhofer-Gesellschaft
  3. Artikel
  4. Exciton diffusion and energy transfer in organic solar cells based on dicyanovinyl-terthiophene
 
  • Details
  • Full
Options
2008
Journal Article
Title

Exciton diffusion and energy transfer in organic solar cells based on dicyanovinyl-terthiophene

Abstract
We discuss exciton transport and energy transfer in organic solar cells based on dicyanovinyl-terthiophene (DCV3T). Time-resolved surface luminescence quenching experiments on double layers of DCV3T and zinc-phthalocyanine as luminescence quencher are analyzed in the framework of a three-level luminescence model with an initially absorbing state of short lifetime that relaxes to a longer living emitting state. Luminescence quenching of the emitting state is assigned to Forster-type energy transfer with an apparent Forster radius of 2.1 nm, which is in accordance with the Forster radius obtained from the spectral overlap integral. A diffusion based analysis for the emitting state yields a diffusion length of L-e=6.9 nm. The short living initial state is quenched by diffusion of the excitons to the interface with a diffusion length of L-a=5.3 nm. External quantum efficiency measurements of the photocurrent in a corresponding organic solar cell structure evaluated with a two-level diffusion model give a diffusion length of L-EQE=6.0 nm, whereas a two-level model for stationary luminescence quenching yields a diffusion length of L-cw=12 nm. This suggests that only one type of the excitons contributes to the photocurrent.
Author(s)
Holzhey, A.
Uhrich, C.
Brier, E.
Reinhold, E.
Bäuerle, P.
Leo, K.
Hoffmann, M.
Journal
Journal of applied physics  
DOI
10.1063/1.2976317
Language
English
Fraunhofer-Institut für Photonische Mikrosysteme IPMS  
  • Cookie settings
  • Imprint
  • Privacy policy
  • Api
  • Contact
© 2024