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Titolo:
Electron transfer dynamics in dye sensitized nanocrystalline solar cells using a polymer electrolyte
Autore:
Nogueira, AF; De Paoli, MA; Montanari, I; Monkhouse, R; Nelson, J; Durrant, JR;
Indirizzi:
Univ Estadual Campinas, Inst Quim, Lab Polimeros Conductores & Reciclagem,BR-13083970 Campinas, SP, Brazil Univ Estadual Campinas Campinas SP BrazilBR-13083970 BCpinas, SP, Brazil Univ London Imperial Coll Sci Technol & Med, Dept Chem, Ctr Elect Mat & Devices, London SW7 2AY, England Univ London Imperial Coll Sci Technol & MedLondon England SW7 2AY gland Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AY, England Univ London Imperial Coll Sci Technol & Med London England SW7 2AY gland
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 31, volume: 105, anno: 2001,
pagine: 7517 - 7524
SICI:
1520-6106(20010809)105:31<7517:ETDIDS>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
TITANIUM-DIOXIDE FILMS; CHARGE RECOMBINATION KINETICS; SOLID-STATE; PHOTOELECTROCHEMICAL CELL; SEMICONDUCTOR-FILMS; TIO2 ELECTRODES; TRANSPORT; POLYPYRROLE; SEPARATION; CONVERSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: De Paoli, MA Univ Estadual Campinas, Inst Quim, Lab Polimeros Conductores & Reciclagem,C Postal 6154, BR-13083970 Campinas, SP, Brazil Univ Estadual Campinas C Postal 6154 Campinas SP Brazil BR-13083970 BC
Citazione:
A.F. Nogueira et al., "Electron transfer dynamics in dye sensitized nanocrystalline solar cells using a polymer electrolyte", J PHYS CH B, 105(31), 2001, pp. 7517-7524

Abstract

Transient absorption spectroscopy was employed to study electron-transfer dynamics in dye sensitized nanocrystalline solar cells incorporating a polymer electrolyte, poly (epichlorohydrin-co-ethylene oxide) containing NaI and I-2, Solar cells employing this solid-state electrolyte have yielded solar to electrical energy conversion efficiencies of up to 2.6%. Electron-transfer kinetics were collected as a function of electrolyte composition, white light illumination, and device voltage and correlated with current/voltage characterization of the cell. The yield of electron injection from the dye excited state into the Tio, electrode was found to be insensitive to electrolyte composition or cell operating conditions. Regeneration of the dye ground state by electron transfer from I- ions in the polymer electrolyte exhibited half times of 4-200 Ais, depending upon the concentration of NaI inthe polymer electrolyte. A long-lived product of the regeneration reactionwas observed and assigned to the I-2(-) radical. At low NaI concentrations, kinetic competition was observed between this regeneration reaction and charge recombination of the oxidized dye with electrons injected into the semiconductor. The decay kinetics of the dye cation, and the yield Of I-2(-),were found to be unchanged by illumination of the cell under either short circuit or open circuit (V-oc = 0.75 V) conditions, From these observations, we conclude that the charge recombination dynamics in this cell are not strongly dependent upon the TiO2 Fermi level over this voltage range. Analogy with studies of recombination dynamics in three electrode photoelectrochemical cells employing a redox inactive liquid electrolyte suggest this observation may be related to the Lewis base nature of the polymer employed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 16:07:40