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O: Fachverband Oberflächenphysik

O 111: Nanostructured Surfaces and Thin Films II: 1D and 2D Systems (joint session O/CPP)

O 111.8: Vortrag

Donnerstag, 19. März 2020, 16:45–17:00, WIL B321

Spatial Extent of Surface Photovoltage in the Vicinity of Individual Plasmon Excited Nanoparticles — •Katharina Engster, Kevin Oldenburg, Karl-Heinz Meiwes-Broer, Sylvia Speller, and Ingo Barke — Institute of Physics, University of Rostock

The investigation of photophysical processes of heterogeneous systems largely relies on local probing techniques [1]. For plasmon assisted electron-hole generation a key property is the size of the region that is affected by enhanced charge carrier density which is accessible via the local surface photovoltage (SPV). Here we present SPV studies of single resonantly excited Ag clusters [2] on Si(100)-(2x1) measured by energy-resolved two-photon photoemission electron microscopy (2PP-PEEM). Analysis of the distance dependence from the particles reveals an enhanced plasmon induced charge carrier density which decays on the scale of 1 µm. This observation is corroborated by comparing spatially averaged SPV for different particle densities. We envision opportunities in the context of plasmon enhanced solar cells, particularly regarding the choice of optimal particle concentrations.
[1] K. Sell et al., Phys. Stat. Sol. (b) 247, 1087 (2010).
[2] K. Oldenburg et al., J. Phys. Chem. C 123, 1379 (2019).