Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.181
Publication date: 18th July 2019
Colloidal nanostructured semiconductor materials, e.g. dot-in-rod heteronanostructures, gained a lot of interest over the past decade as sensitizers for the light-driven water-reduction half reaction by coupling such nanostructures with potential catalysts, e.g. metal nanoparticles. The electronic and optical properties of these nanostructures, which are tunable via their dimensions, render them perfect model systems to study fundamental aspects of their function spectroscopically.
Recently, one of the essential steps in the photocatalytic scheme, the charge separation at the semiconductor/catalyst interface, was studied for a series of CdSe@CdS nanorods tipped with Ni nanoparticles by applying time-resolved transient absorption and photoluminescence spectroscopy. The results indicate that the efficiency of this step depends sensitively on the size of the metal tip, which can be explained based on a model comprising two opposing trends: a size dependent Coulomb blockade and Schottky barrier.[1,2] Further, indications for the need to put charge-carrier transport between the spot of exciton generation and the separating interface into consideration, especially for anisotropic nanostructures with one dimension in the 10s of nm, are currently under closer investigation.
Financial support is acknowledged by the Fonds der Chemischen Industrie (FCI), the COST Action CM1202 PERSPECT-H2O, and the German Research Foundation (DFG) – project number 364549901 - TRR234 [CataLight, B4)].
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