Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 19: Vacuum Science & Technology: Theory and Applications – Poster

O 19.5: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Contact electrification between Au and hydrogen-passivated Si(111) surfaces — •Christian Gruber, Andre Mölleken, Tobias Prost, Hermann Nienhaus, and Rolf Möller — Experimental Physics, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)

The charge of 1mm Au spheres bouncing on a hydrogen-passivated Si(111) surface under vacuum conditions is measured in a parallel-plate capacitor setup with fC charge sensitivity and microsecond time resolution [1]. The transferred charge between metal and semiconductor is determined as a function of impact velocity ranging from 1 to 0 m/s, of doping and of surface condition after preparation. Light exposure to the semiconductor surfaces during experiments shows no significant influence on the results. On p-doped samples the Au spheres collect a charge of typical a few 100fC with each contact. The dependence on the preparation is not as clear as on n-doped samples, on which the quality of the surface preparation clearly causes a polarity change. On n-doped samples the Au spheres collect a typical charge of a few 100 fC to over 1000 fC. However, in the limit of zero impact velocity the variations between the different samples become negligible and Au is found to be charged negative. The results are compared with predicted charge transfer between Au and Si in static Schottky diode models.

[1] M. Kaponig, A. Mölleken, H. Nienhaus, R. Möller, Dynamics of contact electrification, Sci. Adv. 2021, 7 (22), eabg7595.

Keywords: Contact electrification; Triboelectricity; Charge transfer