The relationship between the electric field-induced dissociation of charge transfer excitons and the photocurrent in small molecular/polymeric solar cells

Sahika Inal, Marcel Schubert, Alan Sellinger, Dieter Neher*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

A bulk heterojunction system consisting of a soluble poly(p- phenylenevinylene) donor and a small molecular electron acceptor based on Vinazene (2-vinyl-4,5-dicyanoimidazole) has been investigated with respect to the correlation between field-induced emission quenching and free charge carrier formation. Transient and steady-state emission properties measured at different voltages indicate that emissive charge transfer (CT) excitons formed at the heterojunction are prone to direct field-induced dissociation. However, the split-up of these CT excitons cannot fully account for the photocurrents observed on the very same devices. It is proposed that the formation of free carriers involves a nonemissive precursor and that the recombination of this precursor does not proceed via the formation of CT excitons.

Original languageEnglish (US)
Pages (from-to)982-986
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume1
Issue number6
DOIs
StatePublished - Mar 18 2010

Keywords

  • Macromolecules
  • Soft matter

ASJC Scopus subject areas

  • Materials Science(all)

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