Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: Oxide and Insulator Surfaces: Structure, Epitaxy and Growth

O 48.4: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

First stages of growth of SrxLa(1-x)MnO3 on SrTiO3(110) by PLD — •Giada Franceschi, Michele Riva, Ulrike Diebold, and Michael Schmid — IAP, TU Wien

Among energy conversion devices, solid-oxide fuel-cells (SOFCs) are attracting worldwide interest, being extremely efficient and environmentally friendly. Electricity is generated through electrochemical oxidation of fuels, which is initiated by incorporating oxygen at the cathode surface of the device. The state-of-the-art cathode material is strontium-doped lanthanum manganite (LSM), and current research on SOFCs aims at understanding the mechanisms behind the oxygen incorporation at its surface. As recently demonstrated, the latter must be addressed through atomic scale investigation, but to do so, a well-defined single-crystalline model system needs to be established in advance: within our project, we aimed at obtaining such a single-crystalline model system in the form of thin, atomically flat LSM films, grown by pulsed laser deposition onto SrTiO3(110) substrates. First, we home-prepared and characterized the target for pulsed laser deposition growth. After the optimization of the growth parameters, we incrementally grew LSM on different SrTiO3(110) substrates, and investigated the first stages of growth by employing in-situ STM, LEED, and XPS. For a proper set of growth parameters, LSM realized an ordered growth, resulting in atomically flat surfaces. We observed a changing periodicity with the film thickness, related to some non-trivial interaction mechanisms with the substrate. Atomic scale investigations were used to study the morphology of the grown films.