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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Design and characterisation of bodipy sensitizers for dye-sensitized NiO solar cells.

Author

  • Gareth H Summers
  • Jean-François Lefebvre
  • Fiona A Black
  • E Stephen Davies
  • Elizabeth A Gibson
  • Tönu Pullerits
  • Christopher J Wood
  • Karel Zidek

Summary, in English

A series of photosensitizers for NiO-based dye-sensitized solar cells is presented. Three model compounds containing a triphenylamine donor appended to a boron dipyrromethene (bodipy) chromophore have been successfully prepared and characterised using emission spectroscopy, electrochemistry and spectroelectrochemistry, to ultimately direct the design of dyes with more complex structures. Carboxylic acid anchoring groups and thiophene spacers were appended to the model compounds to provide five dyes which were adsorbed onto NiO and integrated into dye-sensitized solar cells. Solar cells incorporating the simple dye were surprisingly promising relative to the more complex dye . Cell performances were improved with dyes which had increased electronic communication between the donor and acceptor, achieved by incorporating a less hindered bodipy moiety. Further increases in performances were obtained from dyes which contained a thiophene spacer. Thus, the best performance was obtained for which generated a very promising photocurrent density of 5.87 mA cm(-2) and an IPCE of 53%. Spectroelectrochemistry combined with time-resolved transient absorption spectroscopy were used to determine the identity and lifetime of excited state species. Short-lived (ps) transients were recorded for , and which are consistent with previous studies. Despite a longer lived (25 ns) charge-separated state for /NiO, there was no increase in the photocurrent generated by the corresponding solar cell.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2016

Language

English

Pages

1059-1070

Publication/Series

Physical chemistry chemical physics : PCCP

Volume

18

Issue

2

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Physical Chemistry
  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1463-9084