Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Quantitative study of electron losses in nanoporous anatase using transient absorption spectroscopy
Autore:
vant Spijker, H; ORegan, B; Goossens, A;
Indirizzi:
Delft Univ Technol, Fac Sci Appl, Inorgan Chem Lab, NL-2628 BL Delft, Netherlands Delft Univ Technol Delft Netherlands NL-2628 BL 28 BL Delft, Netherlands Energy Ctr Netherlands, NL-1755 ZG Petten, Netherlands Energy Ctr Netherlands Petten Netherlands NL-1755 ZG Petten, Netherlands
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 30, volume: 105, anno: 2001,
pagine: 7220 - 7226
SICI:
1520-6106(20010802)105:30<7220:QSOELI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
TITANIUM-DIOXIDE FILMS; RU-DYE MOLECULES; SENSITIZED NANOCRYSTALLINE TIO2; NANOSTRUCTURED TIO2; SOLAR-CELLS; RECOMBINATION KINETICS; TRANSPORT; STATES; PHOTODISSOCIATION; PHOTOCHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: van't Spijker, H Delft Univ Technol, Fac Sci Appl, Inorgan Chem Lab, Julianalaan 136, NL-2628 BL Delft, Netherlands Delft Univ Technol Julianalaan 136 Delft Netherlands NL-2628 BL
Citazione:
H. van't Spijker et al., "Quantitative study of electron losses in nanoporous anatase using transient absorption spectroscopy", J PHYS CH B, 105(30), 2001, pp. 7220-7226

Abstract

To elucidate electron migration in dye-sensitized nanoporous anatase TiO2,time-of-flight short-circuit photocurrents and transient absorption spectra between 500 and 2000 nm have been recorded. It is found that electrons inTiO2 dominate the transient absorption between 900 and 1100 nm, whereas atwavelengths longer than 1100 nm absorption by electrons in the SnO2:F substrate prevails. To facilitate a qualitative analysis, the absorption cross-sections of electrons in TiO2 and SnO2:F have been measured. Combining transient absorption and photocurrent response data, the time-resolved recombination loss can be determined. When the excitation density is below 33.5 muJ/cm(2), on average less than one electron per nanoparticle is injected. Under this condition the IPCE equals unity. When higher excitation densities are applied, more than one electron per nanoparticle is injected, losses become significant, and the IPCE reduces to 40%. The time evolution of the recombination loss reveals that recombination primarily takes place within a few microseconds.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 10:30:07