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O: Fachverband Oberflächenphysik
O 61: Poster Session V: Oxide and insulator surfaces: Structure, epitaxy and growth I
O 61.8: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Charge Deposition on SrTiO3 as a Model for Spacecraft Surface Charging — •Mirco Wendt1, Franziska Dorn1, Regina Lange1, Jens Berdermann2, Ingo Barke1, and Sylvia Speller1 — 1Institute of Physics, University of Rostock, 18059 Rostock, Germany — 2Institute for Solar-Terrestrial Physics, German Aerospace Center (DLR), 17235 Neustrelitz, Germany
Differential charging due to high energy particle bombardment is a common reason for hardware degradation and sensor errors in spacecrafts. As a model for studying charge accumulation and dynamics, we propose SrTiO3, a transparent oxide with charges deposited by utilising the electron beam of a scanning electron microscope (SEM). In a first step, we show that charges deposited on SrTiO3 (100) surfaces can be observed in ambient environment by force microscopy methods (AFM). Using a plate capacitor model [1], we also estimate the total deposited charge and charge density. To meet the conditions at medium earth orbit and to address more extended life times, in situ AFM-SEM studies in UHV environment are set up.
[1] A. Berkowitz, et al, Appl Phys Lett 74, 472 (1999)