Mr. Hans van't Spijker Profile

Hans van't Spijker

at Delft Univ of Technology

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Proceedings Article | 21 February 2002 Paper

Electron losses in nanostructured anatase using transient absorption spectroscopy

Hans van't Spijker, Albert Goossens

Proceedings Volume 4465, (2002) https://doi.org/10.1117/12.456928

KEYWORDS: Absorption, Nanoparticles, Ruthenium, Absorption spectroscopy, Electron transport, Nanostructuring, Quantum efficiency, Solar cells, Electrodes, Quartz

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In order to elucidate electron migration in dye-sensitised 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 in TiO₂ dominate the transient absorption between 900 and 1100 nm, whereas at wavelengths 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 (mu) J/cm₂, 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 with a few microseconds. One mechanism involves the recombination of electrons with dye cations, occurring in the first 20 ns after laser flash excitation.

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