Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Poster Monday: Surface Structure, Epitaxy, Growth and Tribology
O 22.3: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Distance dependence of local work function on Pb/Si(111) island — Thomas Späth1, •Daniel Rothhardt2, Manuel Schulze2, and Regina Hoffmann-Vogel2 — 1Karlsruhe Institut Technology, D76131 Karlsruhe, Germany — 2Universtity of Potsdam, Institute of Physics and Astronomy, Experimentelle Physik kondensierter Materie, D14469 Potsdam, Germany
In order to gain a better understanding of diffusion of Lead (Pb) islands on Si(111)-(7x7), it is extremely important to provide a complete description of the electronic properties and the forces acting on the system. Using a Scanning Force Microscope in non-contact mode with Pt coated Si-cantilever allows us to perform point bias-approach measurements at 115 K on Pb islands. We have investigated how the local work function changes as a function of tip-sample distance and how the electrostatic force changes as a function of the applied bias between tip and sample. The resulting force was calculated from the frequency shift distance curves using Baratoff's force inversion method. A significant change in the work function was found when the tip-sample distance was less than 1 nm, which could arise from the overlap of the tip wave functions and the sample wave functions.