Accurate measurement of the exciton diffusion length in a conjugated polymer using a heterostructure with a side-chain cross-linked fullerene layer

Denis E. Markov, Emiel Amsterdam, Paul W.M. Blom, Alexander B. Sieval, Jan C. Hummelen

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Abstract

Exciton diffusion and photoluminescence quenching in conjugated polymer/fullerene heterostructures are studied by time-resolved photoluminescence. It is observed that heterostructures consisting of a spin-coated poly(p-phenylene vinylene) (PPV)-based derivative and evaporated C-60 are ill-defined because of diffusion of C60 into the polymer, leading to an overestimation of the exciton diffusion length. This artifact is resolved by the use of a novel, thermally side-chain polymerizing and cross-linking fullerene derivative (F2D) containing two diacetylene moieties, forming a completely immobilized electron acceptor layer. With this heterostructure test system, an exciton diffusion length of 5 +/- 1 nm is derived for this PPV derivative from time-integrated luminescence quenching data.

Original languageEnglish
Pages (from-to)5266-5274
Number of pages9
JournalThe Journal of Physical Chemistry A
Volume109
Issue number24
DOIs
Publication statusPublished - 23-Jun-2005

Keywords

  • PHOTOINDUCED ELECTRON-TRANSFER
  • PLASTIC SOLAR-CELLS
  • PHOTOVOLTAIC CELLS
  • HETEROJUNCTION
  • BUCKMINSTERFULLERENE
  • DISSOCIATION
  • EFFICIENT
  • C-60
  • LUMINESCENCE
  • BLENDS

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