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Exciton diffusion and energy transfer in organic solar cells based on dicyanovinyl-terthiophene.
- Source :
-
Journal of Applied Physics . Sep2008, Vol. 104 Issue 6, p064510. 8p. 4 Diagrams, 1 Chart, 10 Graphs. - Publication Year :
- 2008
-
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 Förster-type energy transfer with an apparent Förster radius of 2.1 nm, which is in accordance with the Förster radius obtained from the spectral overlap integral. A diffusion based analysis for the emitting state yields a diffusion length of Le=6.9 nm. The short living initial state is quenched by diffusion of the excitons to the interface with a diffusion length of La=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 LEQE=6.0 nm, whereas a two-level model for stationary luminescence quenching yields a diffusion length of Lcw=12 nm. This suggests that only one type of the excitons contributes to the photocurrent. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 104
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 34622047
- Full Text :
- https://doi.org/10.1063/1.2976317