Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.11: Poster

Thursday, March 19, 2015, 09:30–12:00, Poster A

Resistive Switching Properties of Chemically Synthesized TiO2 Nanoparticles and Sb2Te3 Hexagonal Platelets — •Tobias Saltzmann¹, Dirk Oliver Schmidt¹, Hehe Zhang², Manuel Bornhöfft³, Michael Noyong¹, Susanne Hoffmann-Eifert², Joachim Mayer³, and Ulrich Simon¹ — ¹IAC, RWTH Aachen University and JARA - FIT, 52074 Aachen, Germany — ²Forschungszentrum Juelich GmbH, PGI 7 and JARA - FIT, 52425 Juelich, Germany — ³GFE, RWTH Aachen University, Aachen, 52074, Germany

We chemically synthesized TiO2 nanoparticles (NPs) and Sb2Te3 hexagonal platelets (HPs) as resistively switching nanostructures and electrically characterized these structures in situ in a SEM by means of a nanomanipulator setup. As a model material for phase change switching, we synthesized single crystalline Sb2Te3 HPs via a solvothermal reaction route. We identified four characteristic reaction intermediates and monitored their evolution by means of nanodiffraction in a STEM. The single HPs were electrically addressed and we monitored phase change switching. As model valence change material we synthesized spherical TiO2 NPs which were subsequently calcined or vacuum-annealed, respectively. For vacuum-annealed NPs we report I-V curves exhibiting forming-free bipolar as well as complementary resistive switching, whereas as synthesized or calcined NPs showed no I-V hysteresis. The properties of the individual NPs were compared with TiOx thin films grown by atomic layer deposition, from which comparable results were obtained.