Porphyrin sensitizer solar cell: a comparison with meso disubstituted push-pull and ?-pyrrolic ZnII-porphyrinates (Abstract/Poster in atti di convegno)

Type
Label
  • Porphyrin sensitizer solar cell: a comparison with meso disubstituted push-pull and ?-pyrrolic ZnII-porphyrinates (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • G. Di Carlo, A. Orbelli Biroli, M. Pizzotti, F. Tessore, V. Trifiletti, R. Ruffo, A. Abbotto, A. Amat, F. De Angelis, P. R. Mussini (2013)
    Porphyrin sensitizer solar cell: a comparison with meso disubstituted push-pull and ?-pyrrolic ZnII-porphyrinates
    in NIS Colloquium - Dye sensitised solar cells: from materials to devices, Torino, 31 Gennaio - 1 Febbraio 2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Di Carlo, A. Orbelli Biroli, M. Pizzotti, F. Tessore, V. Trifiletti, R. Ruffo, A. Abbotto, A. Amat, F. De Angelis, P. R. Mussini (literal)
Note
  • Poster (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Chimica dell'Università degli Studi di Milano, Unità di Ricerca dell'INSTM, via C. Golgi 19, 20133 Milano, Italy Istituto di Scienze e Tecnologie Molecolari del CNR (CNR-ISTM), via C. Golgi 19, 20133 Milano, Italy Department of Materials Science, Solar Energy Research Center MIB-SOLAR, and INSTM Research Unit, University of Milano Bicocca, Via Cozzi 53, I-20125 Milano, Italy Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto di Scienze e Tecnologie Molecolari del CNR (CNR-ISTM), Via Elce di Sotto 8, 06123 Perugia, Italy (literal)
Titolo
  • Porphyrin sensitizer solar cell: a comparison with meso disubstituted push-pull and ?-pyrrolic ZnII-porphyrinates (literal)
Abstract
  • Today renewable energy is a hot topic, both in academic and in industrial research, due to the request of sustainable energy sources; of course, in the more specific field of photovoltaics, dye-sensitized solar cells may represent an alternative low-cost kind of device. In particular, in the last years, push-pull meso disubstituted porphyrins have shown the best photon-to-electron conversion efficiencies as sensitizers in these kind of solar cells,1 however, these dyes can be obtained only by a multistep synthesis with very low total yields. In this work, a facile and fast approach, based on microwave enhanced Sonogashira coupling, was employed to obtain, with good yields, both mono and, for the first time, disubstituted push-pull ZnII-porphyrinates bearing a variety of ethynylphenyl moiety in b-pyrrolic position. Furthermore a comparative experimental, electrochemical and theoretical investigation was carried out between such b mono or disubstituted ZnII-porphyrinates and meso disubstituted push-pull ZnII-porphyrinates. We produced evidence that, although the HOMO-LUMO energy gap of the meso disubstituted push-pull dyes is lower, so that the charge transfer along the push-pull system is easier for these latter, the b mono or disubstituted push-pull porphyrinic dyes show comparable or better efficiencies when acting as sensitizers in DSSCs. This behaviour is probably due to a more facile charge injection into TiO2 surface as suggested by the DFT electron distribution and by the positive effect of the b substitution on the IPCE spectra, which show a relevant intensity over a broad range of wavelengths (350-650 nm). Finally the positive effect due to the presence of a cyanoacrylic group in the ethynyl-phenyl substituent has been analysed with a photophysical and theoretical approach supporting the evidence of a contribution of charge transfer transitions to both the B and Q bands, thus producing, by conjugation, excited electrons close to the carboxylic anchoring group. (literal)
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