August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【230】Sub-picosecond transient absorption of PbS nanocrystals on gold

Sep 1, 2021, 4:15 PM
Room C

Room C

Talk Surfaces, Interfaces and Thin Films Surfaces, Interfaces and Thin Films


Dario Grimaldi (University of Graz)


We investigate the optical dynamics of PbS nanocrystal layers on a gold thin film by microscopy-based ultrafast pump-probe spectroscopy. We probe with femtosecond resolution the transient absorption of nanocrystal films with specific thicknesses ranging from a few to 100 nm, as independently verified by atomic force microscopy. In stark contrast to individual nanocrystal and gold films, the combined system shows sub-picosecond dynamics depending on film thickness and probe wavelength. On basis of the observed parameter dependencies we discuss the models for the underlying charge dynamics in our semiconductor/metal system. While of interest for fundamental reasons, the thorough understanding of such effects is of importance for nanocrystal-based electrical and optoelectrical devices.

Primary authors

Dario Grimaldi (University of Graz) Joachim R. Krenn (University of Graz) Markus Koch (Graz University of Technology) Andreas Hohenau (University of Graz) Pascal Heim (Graz University of Technology) Harald Ditlbacher (University of Graz) Robert Schwarzl (Graz University of Technology)


Dmitry Dirin (ETH Zurich) Maksym Kovalenko (ETH Zurich)

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