Bidirectional Non-Filamentary RRAM as an Analog Neuromorphic Synapse, Part I: Al/Mo/Pr<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> Material Improvements and Device Measurements
We report on material improvements to non-filamentary RRAM devices based on Pr<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> by introducing an MoOx buffer layer together with a reactive Al electrode, and on device measurements designed to help gauge the performance...
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| Auteurs principaux: | , , , , , , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
IEEE
2018
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| Sujets: | |
| Accès en ligne: | https://doaj.org/article/5fc8bb6568104ebfaee6c2b4c7bf4cd8 |
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| Résumé: | We report on material improvements to non-filamentary RRAM devices based on Pr<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> by introducing an MoOx buffer layer together with a reactive Al electrode, and on device measurements designed to help gauge the performance of these devices as bidirectional analog synapses for on-chip acceleration of the backpropagation algorithm. Previous Al/PCMO devices exhibited degraded LRS retention due to the low activation energy for oxidation of the Al electrode, and Mo/PCMO devices showed low conductance contrast. To control the redox reaction at the metal/PCMO interface, we introduce a 4-nm interfacial layer of conducting MoOx as an oxygen buffer layer. Due to the controlled redox reaction within this Al/Mo/PCMO device, we observed improvements in both retention and conductance on/off ratio. We confirm bidirectional analog synapse characteristics and measure “jump-tables” suitable for large scale neural network simulations that attempt to capture complex and stochastic device behavior [see companion paper]. Finally, switching energy measurements are shown, illustrating a path for future device research toward smaller devices, shorter pulses and lower programming voltages. |
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