SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 2: Focus: Dislocations in Ceramics: Mechanics, Structures and Functionality (joint session KFM/MA)
KFM 2.5: Vortrag
Montag, 27. März 2023, 16:25–16:45, POT 51
Dislocation-tuned Schottky barrier in oxide ceramics — •Mehrzad Soleimany1,2, Till Frömling1, Lukas Porz1, Enrico Bruder1, Marin Alexe2, and Jürgen Rödel1 — 1Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287 Darmstadt, Germany — 2Department of Physics, University of Warwick, CV4 7AL Coventry, UK
For decades manipulation of interfaces and point defects in semiconductors have been the main focus of scientists for tuning the functional properties of materials. However, dislocations which are considered as one-dimensional defects, have not only been neglected but also tried to be avoided due to the assumption that they degrade desired properties of semiconductors. Nevertheless, it has recently been shown that this speculation can be challenged and dislocations can even be used to tune the thermal, electrical, and ferroelectric properties of materials, especially when they are introduced in high densities. In this work dislocation densities higher than 4 × 1013 m−2 were introduced in a large volume of the n-type and p-type SrTiO3 by mechanical deformation and cyclic loading. That has been confirmed via sample thinning and electron channeling contrast imaging. Utilizing electrochemical impedance spectroscopy and DC electrical measurements, we showed that based on doping, dislocations can reduce the Schottky barrier in the n-type SrTiO3 by a factor of seven and can increase that by a factor of three in the p-type one.