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Determination of the light-induced degradation rate of the solar cell sensitizer N719 on TiO2 nanocrystalline particles
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
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2005 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 109, no 47, 22413-22419 p.Article in journal (Refereed) Published
Abstract [en]

The oxidative degradation rate, k(deg), of the solar cell dye (Bu4N+)(2)[Ru(dcbpyH)(2)(NCS)(2)](2-), referred to as N719 or [RuL2(NCS)(2)], was obtained by applying a simple model system. Colloidal solutions of N719-dyed TiO2 particles in acetonitrile were irradiated with 532-nm monochromatic light, and the sum of the quantum yields for the oxidative degradation products [RuL2(CN)(2)], [RuL2(NCS)(CN)(2)], and [RuL2(NCS)(ACN)], Phi(deg) was obtained at eight different light intensities in the range of 0.1-16.30 mW/cm(2) by LC-UV-MS. The Phi(deg) values decreased from 3.3 x 10(-3) to 2.0 x 10(-4) in the applied intensity range. By using the relation k(deg) = Phi(deg)k(back) and back electron-transfer reaction rates, k(back), obtained with photoinduced absorption spectroscopy, it was possible to calculate an average value for the oxidative degradation rate of N719 dye attached to TiO2 particles, k(deg) = 4.0 x 10(-2) s(-1). The stability of N719 dye during solar cell operation was discussed based on this number, and on values of the electron-transfer rate between [(RuL2)-L-(III)(NCS)(2)] and iodide ion that are available in the literature.

Place, publisher, year, edition, pages
2005. Vol. 109, no 47, 22413-22419 p.
Keyword [en]
titanium-dioxide films, osmium polypyridyl complexes, electron-transfer, transient absorption, dye sensitization, colloidal tio2, oxidation, ruthenium, iodide, spectroscopy
URN: urn:nbn:se:kth:diva-15225DOI: 10.1021/jp052792vISI: 000233684500048ScopusID: 2-s2.0-29144508878OAI: diva2:333266
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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