Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.91: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Photovoltage on Metallic and Semiconducting Surfaces in Vicinity of Metallic Nanostuctures — •Kevin Oldenburg, Kristian Sell, Stefan Polei, Sylvia Speller, and Ingo Barke — University of Rostock, Institute of Physics, 18051 Rostock, Germany

The effect of the local environment on the dynamics of electron-hole generation and decay is investigated by means of spatially resolved photovoltage measurements. For metallic surfaces such as Si(111)-(7x7) and Si(111)-(5x2)-Au a surprisingly low metal content results in saturation of the coverage-dependent photovoltage [1]. Experiments in progress include the comparison to samples with non-metallic surface states where pronounced spatial variations are expected. An experimental setup is presented that enables measurements at 405 nm wavelength, such that saturation conditions can be efficiently achieved with low thermal load. This is important to understand the spatial distribution of charge carriers at semiconducting surfaces in contact with clusters and metallic nanostructures.

[1] K. Sell, et al., Phys. Stat. Sol. (b) 247, 1087 (2010).