Charge transfer excitons in bulk heterojunctions of a polyfluorene copolymer and a fullerene derivative (Articolo in rivista)

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Label
  • Charge transfer excitons in bulk heterojunctions of a polyfluorene copolymer and a fullerene derivative (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/adfm.200601098 (literal)
Alternative label
  • Loi, MA; Toffanin, S; Muccini, M; Forster, M; Scherf, U; Scharber, M (2007)
    Charge transfer excitons in bulk heterojunctions of a polyfluorene copolymer and a fullerene derivative
    in Advanced functional materials (Internet); John Wiley & Sons Inc., Hoboken (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Loi, MA; Toffanin, S; Muccini, M; Forster, M; Scherf, U; Scharber, M (literal)
Pagina inizio
  • 2111 (literal)
Pagina fine
  • 2116 (literal)
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  • http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1616-3028 (literal)
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  • 17 (literal)
Rivista
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  • 6 (literal)
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  • 13 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1. Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands 2. Ist Studio Mat Nanostrutturati, Consiglio Nazl Res, I-40129 Bologna, Italy 3. Berg Univ Wuppertal, Macromol Chem Grp, D-42119 Wuppertal, Germany 4. Konarka Austria, A-4040 Linz, Austria (literal)
Titolo
  • Charge transfer excitons in bulk heterojunctions of a polyfluorene copolymer and a fullerene derivative (literal)
Abstract
  • The photophysical properties of blends of fluorene copolymer and the fullerene derivative PCBM are analyzed with a particu- lar attention to photovoltaic applications. The properties of the blends are determined by the relative alignment of the HOMO energy levels. In the blend where the HOMO levels of the copolymer and the fullerene are aligned there is not signature of charge stabilization and photovoltaic effect. While in the blend where there is an offset between the HOMO levels the charge stabilization is accompanied by good photovoltaic performances. The photoluminescence spectrum of the latter blend is charac- terized by the appearance of a new peak at low energy with a lifetime of a few ns that red-shifts with the increase of the PCBM percentage. The feature is attributed to the emission from a charge-transfer exciton that is red-shifted by the change of dielec- tric constant of the medium. (literal)
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