Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 18: Thin Oxides and Oxide Layers 1

DS 18.2: Vortrag

Mittwoch, 7. September 2022, 15:15–15:30, H14

Mapping the local strain distribution of oxide membranes using polarization-dependent micro-Raman spectroscopy — •Matthias T. Elm, Alexander Konetschny, Marcel Weinhold, Christian Heiliger, and Peter J. Klar — Justus-Liebig University, Gießen, Germany

Free-standing ceramic membranes are of great interest for miniaturized electrochemical devices, such as micro-solid oxide fuel cells, sensors or memory devices. Free-standing membranes exhibit residual strain, which alters the electrical conductivity and, thus, the performance of the device. Detailed knowledge of the local strain distribution in the membrane is therefore of paramount importance. Here, we show that the local strain state of the membrane can be monitored using polarization dependent micro-Raman mapping. Due to the residual strain the triply degenerate F_2g mode splits and the contribution of their Raman intensity to the overall Raman signal depends on the measurement geometry and the polarization of the incoming and scattered light. Varying the polarization of the incoming excitation light results in different averaging of the Raman-active modes. These results clearly demonstrate that polarization-dependent Raman measurements have the potential to yield additional insight into the local strain distribution in free-standing oxide membranes.