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Photoinduced ultrafast dynamics of comnarin 343 sensitized p-type-nanostructured NiO films
KTH, Skolan för kemivetenskap (CHE), Kemi, Fysikalisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
2005 (Engelska)Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 109, nr 41, s. 19403-19410Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Photoinduced electron transfer from the valence band of nanocrystalline NiO, a p-type semiconductor, to an excited bound dye, coumarin 343, and the subsequent recombination have been measured by femtosecond transient absorbance spectroscopy probing with white light. It was found that both processes are nonexponential. The photoinduced electron transfer from the semiconductor to the excited bound dye has an ultrafast component (similar to 200 fs), which is comparable to the time constants measured for photoinduced electron injection in C343-TiO2 colloid solutions. The process is very efficient and constitutes the main path of deactivation of the excited dye. Back electron transfer is also remarkably fast, with the main part of the recombination process happening with a time constant of similar to 20 ps. Dye-sensitized nanostructured p-type semiconductors are attractive materials due to their potential use as photocathodes in dye-sensitized solar cells and solid electrolytes in solid-state dye-sensitized solar cells. To our knowledge, this is the first time that the photoinduced electron-transfer kinetics of a sensitized p-type semiconductor has been studied.

Ort, förlag, år, upplaga, sidor
2005. Vol. 109, nr 41, s. 19403-19410
Nyckelord [en]
interfacial electron-transfer, pumped dye lasers, solvation dynamics, titanium-dioxide, pulse-radiolysis, coumarin dyes, solar-cell, spectral sensitization, triplet-state, tio2 films
Identifikatorer
URN: urn:nbn:se:kth:diva-15123DOI: 10.1021/jp053230eISI: 000232612100054Scopus ID: 2-s2.0-27544461477OAI: oai:DiVA.org:kth-15123DiVA, id: diva2:333164
Anmärkning
QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Boschloo, GerritHagfeldt, Anders
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