Regensburg 2016 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 12: Postersession DS

DS 12.45: Poster

Montag, 7. März 2016, 17:00–19:00, Poster A

Electronic Tuning in Phase Change Materials using Ionic Liquid Gating — •Bo Thöner, Hanno Volker, Tobias Schäfer, Peter Jost, Artur Romanov, and Matthias Wuttig — I. Physikalisches Institut (IA), RWTH Aachen University

Phase change materials (PCM), which are renowned for their pronounced optical and electrical property changes upon crystallization, receive renewed interest because of their potential applications in novel electronic storage devices.

Since disorder strongly affects their properties, PCMs are an obvious choice to examine the competing impact of electron correlation and disorder-induced localization, which both can explain metal-insulator transitions (MITs). In the scope of Anderson's theory, the MIT is achieved by moving the so-called mobility edge with respect to the Fermi energy. On the one hand, the mobility edge can be shifted by thermal annealing. On the other hand, it is reasonable to assume that a transition due to a shift of the Fermi energy by applying an electric field is also possible. This could allow for a more precise and reversible crossing of the MIT and a better understanding of the process. Hence, we have investigated the feasibility of using ionic liquid gating as a method to induce the MIT.

The use of ionic liquids as the gating electrolyte enables a potentially larger number of induced charge carriers compared to conventional gating which increases the range in which the Fermi energy can be shifted.