Electron injection and recombination in Ru(dcbpy)(2)(NCS)(2) sensitized nanostructured ZnO
2001 (English)In: Journal of Physical Chemistry B, ISSN 1089-5647, Vol. 105, no 24, 5585-5588 p.Article in journal (Refereed) Published
The dynamics of electron-transfer processes between bis(tetrabutylammonium) cis-bis(thiocyanato)bis(2,2'-bypiridine-4,4'-dicarboxylato)ruthenium(II) (called N719) and nanostructured ZnO films have been investigated by femtosecond and nanosecond spectroscopy. The incident photon to current conversion efficiency (IPCE) for these dye-sensitized electrodes was 36% in the maximum of 530 nm, corresponding to a quantum efficiency of 80%. The highest: IPCE values were obtained when the electrodes were prepared under conditions where formation of dye aggregates in the pores of the nanostructured films is avoided. For such films, the electron injection time was in the subpicosecond regime (< 300 fs), which is comparable to the N719-TiO2 system. The back electron-transfer kinetics between conduction band electrons and oxidized dye molecules were biexponential with time constants of 300 mus and 2.6 us. Variation of the light intensity did not affect the time constants, but only their relative weights. The kinetics of back electron transfer in the N719-ZnO and N719-TiO2 systems were found to be identical.
Place, publisher, year, edition, pages
2001. Vol. 105, no 24, 5585-5588 p.
titanium-dioxide films, thin-films, nanocrystalline, relaxation, interface, dynamics, kinetics, complex, state, cells
IdentifiersURN: urn:nbn:se:kth:diva-20719ISI: 000169371500001OAI: oai:DiVA.org:kth-20719DiVA: diva2:339415
QC 201005252010-08-102010-08-10Bibliographically approved