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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. The problem is to gather solar light at an effective cost!.
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Celle Solari Fotosensibilizzate:Comprendere il meccanismo, migliorare l’efficienza
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
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.
Dye-Sensitized Solar Cells: Flexible, colorful, transparent PVs
ERG, Permasteelisa, Dyesol IT, Tozzi Renewable Energy, Targetti Sankey, Colorobbia
James Durrant
Arthur J. Nozik
14 INVITED SPEAKERS
64 ORAL PRESENTATIONS
30 COUNTRIES
260 PARTICIPANTS
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.
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
Alignment of excited state potentials:
F. De Angelis, S. Fantacci, A. Selloni, Nanotechnology, 2008, 19, 424002.
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.
MIUR PRIN 2008 ongoing
IIT-SEED 2009 ongoing
Submitted Projects:
