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Ionic modulation and ionic coupling effects in MoS2 devices for neuromorphic computing
Xiaojian Zhu1, Da Li2, Xiaogan Liang2
1Department of Electrical Engineering and Computer Science, The University of Michigan, Ann Arbor, MI, USA.
Nature Materials
|December 19, 2018
Summary
Researchers demonstrated reversible phase transitions in molybdenum disulfide (MoS2) using electric-field-driven lithium-ion (Li+) migration. This enables memristive devices with potential for artificial neural networks.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Coupled ionic-electronic effects are crucial for advanced device development.
- Layered two-dimensional materials like MoS2 exhibit unique ionic transport properties.
Purpose of the Study:
- To investigate the reversible modulation of MoS2 films via electric-field-controlled ion migration.
- To explore the potential of these modulated films for memristive devices and neuromorphic computing.
Main Methods:
- Utilizing electric fields to control the migration of Li+ ions within MoS2 films.
- Observing phase transitions between the 2H (semiconductor) and 1T' (metal) phases of MoS2.
- Fabricating and characterizing coupled devices demonstrating memristive behavior.
Main Results:
- Achieved reversible modulation of MoS2 films, consistent with 2H-1T' phase transitions.
- Demonstrated excellent memristive behavior in the modulated MoS2 devices.
- Showcased direct coupling of devices through ionic exchange, leading to biological synaptic effects (competition and cooperation).
Conclusions:
- Field-driven ionic processes can directly modulate two-dimensional materials.
- This approach holds promise for future electronic and energy devices.
- Potential for biorealistic implementation of artificial neural networks using coupled ionic-electronic effects.
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