Tuning the stability of graphene layers by phthalocyanine-based oppv oligomers towards photo- and redoxactive materials

Linda Brinkhaus, Georgios Katsukis, Jenny Malig, Rubén D. Costa, Miguel Garcia-Iglesias, Purificaciõn Vázquez, Tomás Torres, Dirk M. Guldi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In contrast to pristine zinc phthalocyanine (1), zinc phthalocyanine based oPPV-oligomers (2-4) of different chain lengths interact tightly and reversibly with graphite, affording stable and finely dispersed suspensions of mono- to few-layer graphene - nanographene (NG) - that are photoactive. The p-type character of the oPPV backbones and the increasing length of the oPPV backbones facilitate the overall π-π interactions with the graphene layers. In NG/2, NG/3, and NG/4 hybrids, strong electronic coupling between the individual components gives rise to charge transfer from the photoexcited zinc phthalocyanines to NG to form hundreds of picoseconds lived charge transfer states. The resulting features, namely photo- and redoxactivity, serve as incentives to construct and to test novel solar cells. Solar cells made out of NG/4 feature stable and repeatable photocurrent generation during several 'on-off' cycles of illumination with monochromatic IPCE values of around 1%. Photoactive graphene hybrids: p-type oligo-para-phenylene vinylene zinc phthalocyanine oligomers exfoliate graphite, interact electronically with wet-chemically exfoliated graphite via charge transfer, and produce photocurrent upon illumination.

Original languageEnglish
Pages (from-to)2348-2357
Number of pages10
JournalSmall
Volume9
Issue number13
DOIs
Publication statusPublished - 2013 Jul 8
Externally publishedYes

Keywords

  • charge transfer
  • exfoliation
  • graphene
  • phthalocyanines
  • solar cells

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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  • Cite this

    Brinkhaus, L., Katsukis, G., Malig, J., Costa, R. D., Garcia-Iglesias, M., Vázquez, P., Torres, T., & Guldi, D. M. (2013). Tuning the stability of graphene layers by phthalocyanine-based oppv oligomers towards photo- and redoxactive materials. Small, 9(13), 2348-2357. https://doi.org/10.1002/smll.201202427