Author/Authors :
Kerp، نويسنده , , H.R. and Donker، نويسنده , , H. and Koehorst، نويسنده , , R.B.M. and Schaafsma، نويسنده , , T.J. and van Faassen، نويسنده , , E.E.، نويسنده ,
Abstract :
The mean free path length for excitons was determined in flat organic dye films. From simulations of the photocurrent response of solar cells, consisting of n-type perylene tetracarboxy diimide and a p-type organic dye, we found an exciton diffusion length of 30±10 nm for zinc phthalocyanine (ZnPc), and 7±3 nm for zinctetra-(octylphenyl)-porphyrin (ZnTOPP). The value for ZnTOPP was independently confirmed by the luminescence quenching observed in ZnTOPP layers doped with a variable concentration of quenchers. The results show the direct correlation between the photovoltaic yield of a macroscopic device and the process of energy migration on a molecular scale.
