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Artificial Synapse Emulated through Fully Aqueous Solution-Processed Low-Voltage In2O3 Thin-Film Transistor with
Youhang Zhou1, Jun Li1, Yaohua Yang1
1School of Material Science and Engineering , Shanghai University , Jiading, Shanghai 201800 , People's Republic of China.
ACS Applied Materials & Interfaces
|December 10, 2019
Summary
Researchers developed a new aqueous solution-processed oxide synaptic transistor using Indium Oxide and Gadolinium Oxide. This device mimics brain synapse behavior, offering potential for efficient, self-learning neuromorphic computing systems.
Area of Science:
- Materials Science
- Electronics Engineering
- Neuroscience
Background:
- Neuromorphic computing offers efficient, self-learning, and parallel processing capabilities, presenting an alternative to traditional computers.
- Synaptic transistors are crucial for mimicking brain synapse behavior in neuromorphic systems.
- Solid oxide-based synaptic transistors are preferred for large-scale fabrication over liquid or organic alternatives.
Purpose of the Study:
- To investigate the potential of aqueous solution-processed Gadolinium Oxide (Gd2O3) as a solid electrolyte for synaptic transistors.
- To fabricate and characterize a fully aqueous solution-processed Indium Oxide (In2O3)/Gd2O3 thin-film transistor (TFT) for artificial synapse applications.
- To study the synaptic behavior and plasticity of the fabricated TFT, including its response to various stimuli.
Main Methods:
- Microstructure and dielectric properties of Gd2O3 films were analyzed.
- A fully aqueous solution-processed In2O3/Gd2O3 TFT was fabricated.
- Electrical performance, including threshold voltage and subthreshold swing, was measured.
- Artificial synapse behavior, short-term plasticity, and excitatory postsynaptic current were stimulated and studied.
- The effect of illumination stress on synaptic behavior was investigated.
Main Results:
- Gd2O3 films exhibited suitable microstructure and dielectric properties for synaptic transmission simulation.
- The In2O3/Gd2O3 TFT demonstrated acceptable electrical performance with a low threshold voltage (1.24 V) and subthreshold swing (0.12 V/decade).
- The device successfully emulated artificial synapse behavior, showing short-term plasticity.
- Excitatory postsynaptic current dependence on pulse magnitude, width, and frequency was confirmed.
- Illumination stress affected synaptic transmission, linked to oxygen vacancy ionization.
Conclusions:
- Aqueous solution-processed Gd2O3 is a viable solid electrolyte for synaptic transistors.
- The fabricated In2O3/Gd2O3 TFT shows promise as an artificial synapse.
- This approach offers a scalable and efficient method for developing oxide synaptic transistors for neuromorphic computing.
