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Understanding and Improving the Mechanism of Celle Solari Fotosensibilizzate for Enhanced Efficiency

This presentation explores the mechanism of Celle Solari Fotosensibilizzate and offers strategies for improving the efficiency of solar light absorption. It covers topics such as solar emission, conduction, valence, dye-sensitized solar cells, and modeling of TiO2 nanoparticles. The speaker is Filippo De Angelis from the Istituto CNR di Scienze e Tecnologie Molecolari.

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Understanding and Improving the Mechanism of Celle Solari Fotosensibilizzate for Enhanced Efficiency

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  1. Celle Solari Fotosensibilizzate:Comprendere il meccanismo, migliorare l’efficienza • Filippo De Angelis • Istituto CNR di Scienze e Tecnologie Molecolari (ISTM), c/o Dipartimento di Chimica, Università di Perugia, I-06123 Perugia, Italy

  2. The problem is to gather solar light at an effective cost! Solar Emission CONDUCTION 1100 nm 1.12 eV SILICON TiO2 VALENCE CONDUCTION SILICON 380 nm 3.20 eV TiO2 300 Wavelength (nm) 2500 4.13 Energy (eV) 0.50 VALENCE

  3. (N3-N34-)‏ Acidic COOH groups Dye-sensitized solar cells: =11.3 % Ru(II)-polypyridyl sensitizers on TiO2 iph  rate of electron injection Voc  position of the conduction band =iph Voc ff / Is O’Regan, B.; Grätzel, M. Nature, 1991, 353, 737 ; M. Grätzel, Nature, 2001, 414, 338.

  4. Dye-Sensitized Solar Cells: Flexible, colorful, transparent PVs ERG, Permasteelisa, Dyesol IT, Tozzi Renewable Energy, Targetti Sankey, Colorobbia

  5. 3 KEYNOTE SPEAKERS • Michael Grätzel James Durrant Arthur J. Nozik 14 INVITED SPEAKERS 64 ORAL PRESENTATIONS 30 COUNTRIES 260 PARTICIPANTS

  6. Absorption spectrum of N719 in water: Exp. Theor. * HOMO-3 HOMO LUMO Intensity (arb. units)‏ MLCT (II)‏ MLCT (I)‏ Energy (eV)‏ S. Fantacci, F. De Angelis, A. SelloniJ. Am. Chem. Soc. 2003, 125, 4381. F. De Angelis, S. Fantacci, A. SelloniChem. Phys. Lett. 2004, 389, 204. F. De Angelis, S. Fantacci, M.K. Nazeeruddin Chem. Phys. Lett. 2005, 415, 115. F. De Angelis,. S. Fantacci, M. Grätzel et al. J. Am. Chem. Soc. 2005, 127, 16835.

  7. Modeling of TiO2 nanoparticles: Stoichiometric anatase (TiO2)38 and (TiO2)82 clusters of 1 and 2 nm dimensions exposing (101) surfaces 20.5 Å 18.5 Å Ti82O164 B3LYP/3-21g* B3LYP/DZVP TD-DFT gap in water 3.20/3.41 eV 3.13/3.35 eV Experimental gap in acqueous solutions: 3.20 – 3.30 eV F. De Angelis, A. Tilocca, A. Selloni J. Am. Chem. Soc. 2004, 126, 15024

  8. Alignment of excited state potentials: F. De Angelis, S. Fantacci, A. Selloni, Nanotechnology, 2008, 19, 424002.

  9. Charge generation and injection mechanisms: N3 + hν N3* N3+ + 1 e - hν 1 e - F. De Angelis, S. Fantacci, A. Selloni, M. GrätzelJ. Am. Chem. Soc.2007, 129, 10320.

  10. From Design to Prototypes: The TECNO-SOLART spin-off Regione dell’Umbria Comune di Perugia

  11. Approved Projects:  MIUR PRIN 2008 ongoing  IIT-SEED 2009 ongoing • Dyesol 2009 ongoing • ESF 2009 ongoing • EU-FP7: ENERGY-2009-India2010 • EU-FP7: NMP-2009 2010 • PON 2010 (Tozzi Renable Energy) • Cariplo 2010 (Fondazione Cariplo) • MATTM 2010 (Targetti Sankey/Daunia Solar Cells) Submitted Projects:

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