Spontaneous room-temperature formation of broccoli-like Ag–GeTe nanostructures assisting filamentary resistive switching

Spontaneous room-temperature formation of broccoli-like Ag–GeTe nanostructures assisting... We report on a novel fabrication of nanostructures of silver (Ag) germanium telluride (GeTe) at room temperature and the control of resistive switching using them. We systematically fabricated Ag seed nanoparticles of various sizes by thermal annealing and demonstrated that deposition of GeTe by RF sputtering onto the Ag seed nanoparticles spontaneously produced nanostructures including broccoli-like, hollow nanostructures comprised predominantly of nanocrystalline grains of Ag, Ag3Ge, Ag2Te, and Ag5Te3. The nanostructure shape and the constituent crystalline phases depend on the amount of Ag used for the seeds. The nanostructure formation followed nanoscale phase separation and crystallization into an unexpected phase from the phase diagram, including a metastable state. The structural changes were characteristic of the Ag nanoparticles; no significant structural changes occurred for GeTe deposition onto Ag films. As an application of the spontaneously formed nanostructures, we demonstrated a control resistive switching when a voltage was applied with a lateral Ag electrode pair deposited onto the top. We found that the Ag amount used for the seed formation determined the polarity of resistive switching and the SET/RESET voltages. By increasing the Ag amount, the resistive switching turned from the clockwise direction to the counter-clockwise direction, and the SET/RESET voltages were lowered. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Spontaneous room-temperature formation of broccoli-like Ag–GeTe nanostructures assisting filamentary resistive switching

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-018-2493-z
Publisher site
See Article on Publisher Site

Abstract

We report on a novel fabrication of nanostructures of silver (Ag) germanium telluride (GeTe) at room temperature and the control of resistive switching using them. We systematically fabricated Ag seed nanoparticles of various sizes by thermal annealing and demonstrated that deposition of GeTe by RF sputtering onto the Ag seed nanoparticles spontaneously produced nanostructures including broccoli-like, hollow nanostructures comprised predominantly of nanocrystalline grains of Ag, Ag3Ge, Ag2Te, and Ag5Te3. The nanostructure shape and the constituent crystalline phases depend on the amount of Ag used for the seeds. The nanostructure formation followed nanoscale phase separation and crystallization into an unexpected phase from the phase diagram, including a metastable state. The structural changes were characteristic of the Ag nanoparticles; no significant structural changes occurred for GeTe deposition onto Ag films. As an application of the spontaneously formed nanostructures, we demonstrated a control resistive switching when a voltage was applied with a lateral Ag electrode pair deposited onto the top. We found that the Ag amount used for the seed formation determined the polarity of resistive switching and the SET/RESET voltages. By increasing the Ag amount, the resistive switching turned from the clockwise direction to the counter-clockwise direction, and the SET/RESET voltages were lowered.

Journal

Journal of Materials ScienceSpringer Journals

Published: May 29, 2018

References

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