Resistance Drift Convergence and Inversion in Amorphous Phase Change Materials
Advanced Functional Materials, vol. 32
Abstract
Abstract Phase change materials (PCMs) are key to the development of artificial intelligence technologies such as high‐density memories and neuromorphic computing, thanks to their ability for multi‐level data storage through stepwise resistive encoding. Individual resistance levels are realized by adjusting the crystalline and amorphous volume fraction of the memory cell. However, the amorphous phase exhibits a drift in resistance over time that has so far hindered the commercial implementation of multi‐level storage schemes. In this study, the underlying physical process of resistance drift with the goal of modeling is elucidated that will help minimize and potentially overcome drift in PCM memory devices. Clear evidence is provided that the resistance drift is dominated by glass dynamics. Resistivity convergence and drift inversion for the amorphous chalcogenide Ge15Te85 and the PCM Ge3Sb6Te5 are experimentally demonstrated and these changes are successfully predicted with a glass dynamics model. This new insight into the resistance drift process provides tools for the development of advanced PCM devices.
Authors 6
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Affiliation as printed
Institute of Physics IA RWTH Aachen University 52074 Aachen Germany
Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany
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Affiliation as printed
Institute of Physics IA RWTH Aachen University 52074 Aachen Germany
Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany
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Affiliation as printed
PGI‐10 Forschungszentrum Jülich 52425 Jülich Germany
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Affiliation as printed
Department of Chemistry Aarhus University DK‐8000 Aarhus‐C Denmark
Department of Chemistry, Aarhus University, DK-8000 Aarhus-C, Denmark
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Affiliation as printed
Department of Materials Science and Engineering University of Arizona Tucson AZ 85721 USA
Department of Materials Science and Engineering, University of Arizona, Tucson, AZ, 85721 USA
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Institute of Physics IA RWTH Aachen University 52074 Aachen Germany
PGI‐10 Forschungszentrum Jülich 52425 Jülich Germany
Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany
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