Abstract
All solid-state lithium-ion transistors are considered as promising synaptic devices for building artificial neural networks for neuromorphic computing. However, the slow ionic conduction in existing electrolytes hinders the performance of lithium-ion-based synaptic transistors. In this study, we systematically explore the influence of ionic conductivity of electrolytes on the synaptic performance of ionic transistors. Isovalent chalcogenide substitution such as Se in Li3PO4 significantly reduces the activation energy for Li ion migration from 0.35 to 0.253 eV, leading to a fast ionic conduction. This high ionic conductivity allows linear conductance switching in the LiCoO2 channel with several discrete nonvolatile states and good retention for both potentiation and depression steps. Consequently, optimized devices demonstrate the smallest nonlinearity ratio of 0.12 and high on/off ratio of 19. However, Li3PO4 electrolyte (with lower ionic conductivity) shows asymmetric and nonlinear weight-update characteristics. Our findings show that the facilitation of Li ionic conduction in solid-state electrolyte suggests potential application in artificial synapse device development.
Highlights
The recent advances in development of redox transistor such as lithium-ion synaptic transistor (LIST) to build an artificial neural networks exhibit tremendous advantages over the existing memristors technology[1,2,3]
In spite the recent advances in developing high Li+ conducting electrolyte, in this study we have demonstrate Se doping in Li3PO4 electrolyte and develop a LIST device compatible Li3POxSex solid electrolyte
Without a way to address the influence of ionic conductivity and develop high ionic conductive in thin film electrolyte, the LIST cannot function as an ideal synaptic device
Summary
The recent advances in development of redox transistor such as lithium-ion synaptic transistor (LIST) to build an artificial neural networks exhibit tremendous advantages over the existing memristors technology[1,2,3]. The polymer-based solid-state electrolyte, polyethylene oxide: lithium perchlorate (PEO: LiClO4), has been proven to be capable of achieving excellent synaptic functionality owing to the high ionic conductivity of PEO substitute[2]. The polymer-based solid-state electrolyte PEO: LiClO4 is soluble in a commonly used lithographic solvent that complicates the creation of the top gate architecture These devices are always fabricated with a lateral gate architecture with gaps of several micrometers from a channel that induces a large electric double layer formation, which causes an adverse effect on ion migration reversibility. In spite the recent advances in developing high Li+ conducting electrolyte, in this study we have demonstrate Se doping in Li3PO4 electrolyte and develop a LIST device compatible Li3POxSex solid electrolyte. To enhance the practicality of employing LIST as an ideal synapse device, we devoted our study to develop a LIST compatible thin film electrolyte and systematically explore its effect on synaptic functionalities
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