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O: Fachverband Oberflächenphysik
O 10: Oxides I: Growth and Characterization
O 10.6: Vortrag
Montag, 16. März 2020, 11:45–12:00, WIL B321
Detecting Tiny Cation Nonstoichiometry in Complex Oxide Films — •Michele Riva, Giada Franceschi, Michael Schmid, and Ulrike Diebold — IAP, TU Wien, Austria
The rise of semiconductor-based electronics has gone hand in hand with the technological advancements allowing to reproducibly prepare materials with exceptionally small concentration of defects. A similar control of defects and composition is the key to making all-oxide electronics a reality, allowing to fully exploit the multitude of functionalities of these materials. Precise tuning of the oxide composition, however, requires the development of reliable tools to detect cation nonstoichiometry with extreme sensitivity: We develop an unconventional method based on STM that pushes down this detection limit by at least one order of magnitude [1].
We take advantage of the well-controlled surface reconstructions of SrTiO3(110), and use the established relation between those reconstructions and the surface composition to assess the cation excess deposited in PLD-grown SrTiO3(110) films. We demonstrate that a <0.1% change in cation non-stoichiometry is detectable by our approach, and show that, for thin films that accommodate all the non-stoichiometry at the surface, our method has no fundamental detection limit.
[1] Phys. Rev. Mater. 3, 043802 (2019)