Novel Carbazole-Phenothiazine Dyads for Dye-Sensitized Solar Cells: A Combined Experimental and Theoretical Study (Articolo in rivista)

Type
Label
  • Novel Carbazole-Phenothiazine Dyads for Dye-Sensitized Solar Cells: A Combined Experimental and Theoretical Study (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/am402675q (literal)
Alternative label
  • Marotta, Gabriele (1); Reddy, Marri Anil (2); Singh, Surya Prakash (2); Islam, Ashraful (3); Han, Liyuan (3); De Angelis, Filippo (1); Pastore, Mariachiara (1); Chandrasekharam, Malapaka (2) (2013)
    Novel Carbazole-Phenothiazine Dyads for Dye-Sensitized Solar Cells: A Combined Experimental and Theoretical Study
    in ACS applied materials & interfaces (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Marotta, Gabriele (1); Reddy, Marri Anil (2); Singh, Surya Prakash (2); Islam, Ashraful (3); Han, Liyuan (3); De Angelis, Filippo (1); Pastore, Mariachiara (1); Chandrasekharam, Malapaka (2) (literal)
Pagina inizio
  • 9635 (literal)
Pagina fine
  • 9647 (literal)
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  • http://pubs.acs.org/doi/abs/10.1021/am402675q (literal)
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  • 5 (literal)
Rivista
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  • 13 (literal)
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  • 19 (literal)
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  • 1. Computational Laboratory for Hybrid Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Molecolari, via Elce di Sotto 8, I-06123, Perugia, Italy 2. Network of Institutes for Solar Energy (CSIR-NISE), Inorganic & Physical Chemistry Division, CSIR--Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad -500607, India 3. Photovoltaic Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan (literal)
Titolo
  • Novel Carbazole-Phenothiazine Dyads for Dye-Sensitized Solar Cells: A Combined Experimental and Theoretical Study (literal)
Abstract
  • We report a joint experimental and computational work on new organic donor-acceptor dye sensitizers in which a carbazole (CZ) and a phenothiazine (PTZ) units are linked together by an alkyl C6H13, while two different anchoring groups are employed: the cyanoacrylic acid (CS1A, CSORG1) and the rhodanine-3-acetic acid (CS4A, CSORG4). The CZ moiety has multiple roles of (i) acting as an extra-electron donor portion, providing more electron density on the PTZ; (ii) suppressing the back-electron transfer from TiO2 to the electrolyte by forming a compact insulating dye layer; (iii) modulating dye aggregation on the semiconductor surface; and (iv) acting as an antenna, collecting photons and, through long-range energy transfer, redirecting the captured energy to the dye sensitizer. We show that the introduction of the CZ donor remarkably enhances the photovoltaic performances of the rhodanine-based dye, compared to the corresponding simple PTZ dye, with more than a two-fold increase in the overall efficiencies, while it does not bring beneficial effects in the case of the cyanoacrylic-based sensitizer. Based on quantum mechanical calculations and experimental measurements, we show that, in addition to a favored long-range energy transfer, which increases the light absorption in the blue region of the spectrum, the presence of the CZ unit in the CSORG4 dye effectively induces a beneficial aggregation pattern on the semiconductor surface, yielding a broadened and red-shifted light absorption, accounting for the two-fold increase in the generated photocurrent. (literal)
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