Relationship of photophysical properties and the device performance of novel hybrid smallmolecular/polymeric solar cells

Sahika Inal, Mauro Castellani, Alan Sellinger, Dieter Neher*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We investigate solar cells comprised of a vinazene derivative (HV-BT) as the electron acceptor and the well-known polymer poly(3-hexylthiophene) as the electron donor. In the as-prepared blend, most of the excited state species, including the excimers on HV-BT, are quenched at the heterojunction. Although the photophysical properties of the blends change upon annealing, the blend solar cells largely remain uninfluenced by such treatments. A significant improvement is, however, observed when inducing phase separation at a longer length scale, for example, in solutionprocessed bilayer devices. Hereby, both the fill factor (FF) and the open circuit voltage are considerably increased, pointing to the importance of the heterojunction topology and the layer composition at the charge extracting contacts. An optimized device exhibits a power conversion efficiency of close to 1%.

Original languageEnglish (US)
Pages (from-to)1263-1268
Number of pages6
JournalMacromolecular Rapid Communications
Volume30
Issue number14
DOIs
StatePublished - Jul 16 2009

Keywords

  • Excimers
  • Interfaces
  • Morphology
  • Organic solar cells
  • Time-resolved spectroscopy

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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