http://www.cnr.it/ontology/cnr/individuo/prodotto/ID310104
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
- 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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