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Atomistic mechanisms of copper filament formation and composition in Al2O3-based conductive bridge random access memory

Published on 29 March 2018
Atomistic mechanisms of copper filament formation and composition in Al2O3-based conductive bridge random access memory
Description
 
Date 
Authors
Nail C., Blaise P., Molas G., Bernard M., Roule A., Toffoli A., Perniola L., Vallée C.
Year2017-0350
Source-TitleJournal of Applied Physics
Affiliations
CEA/LETI, Grenoble, France, CNRS/LTM, Grenoble, France
Abstract
Conductive filament formation and composition in Oxide-based Conductive Bridge Random Access Memory (CBRAM) are investigated. To this end, Al2O3/Cu-based CBRAM is electrically characterized and studied. Current-voltage characteristics exhibit different forming behaviors depending on device polarization exposing the charged species involved during the forming process. In order to get more insights at the microscopic level, ion diffusion is investigated in depth by first-principles calculations. We study different point defects in Al2O3 which can come either from the post-process of the material itself or after top electrode deposition or during device operation. Since the role of Oxygen Vacancies (VO) and Copper (Cu) ions is core to the switching mechanism, ab initio calculations focus on their displacements. For different charge states in Al2O3, we extract the thermodynamic and activation energies of Cu, Te, Al, and O related point defects. The results reveal that Cu is not the only ion diffusing in the Al2O3-based CBRAM switching mechanism while Te ions appear unfavorable. A Cu/VO based hybrid filament model is proposed, and the impact of Aluminum Vacancies (VAl) on the forming process is demonstrated. © 2017 Author(s).
Author-Keywords
 
Index-Keywords
Activation energy, Aluminum alloys, Binary alloys, Calculations, Copper, Defects, Ions, Oxygen vacancies, Point defects, Vanadium alloys, Ab initio calculations, Atomistic mechanism, Conductive filaments, Conductive-bridge random access memory (cbram), Filament formation, First-principles calculation, Random access memory, Switching mechanism, Random access storage
ISSN218979
LinkLink

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