Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Magnetic Thin Films III
MA 32.7: Vortrag
Donnerstag, 26. März 2009, 11:45–12:00, HSZ 403
Analysis of electronic defect states in lanthanum manganite / strontium titanate heterointerfaces by photovoltage and photoconductivity spectroscopy — •Elke Beyreuther1, Andreas Thiessen1, Stefan Grafström1, Kathrin Dörr2, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany — 2Institut für Metallische Werkstoffe, IFW Dresden, D-01171Dresden, Germany
Similar to conventional microelectronic device structures, the performance of all-oxide electronic devices crucially depends on the electronic defect state distribution at the surfaces and interfaces of a given heterostructure. As soon as wide-bandgap oxides are involved, the analysis of the electronic properties becomes a challenge due to low carrier concentrations, which make classical electrical characterization methods fail.
Thus, in the present approach we choose optical techniques such as surface photovoltage and photoconductivity spectroscopy to map the distribution of defect states in heterostructures, consisting of lanthanum manganite (La0.7Ca0.3MnO3, La0.7Ce0.3MnO3) thin films on SrTiO3 substrates.
Within the framework of a comparative evaluation of our spectra we also discuss the information content and the perspective of the methods applied.