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Updated: Jan 23, 2026
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
Published on: July 18, 2025
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Laser-reconfigured MoS2/ZnO van der Waals synapse
Shu-Hong Shen1, Xue-Feng Wang1, Ye Tian1
1Institute of Microelectronics, Tsinghua University, Beijing 100084, China and Tsinghua Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, China. RenTL@tsinghua.edu.cn.
Nanoscale
|June 6, 2019
Summary
Researchers developed a novel optoelectronic synapse using a transition metal sulfide and zinc oxide heterojunction. This device mimics biological synapses, offering potential for advanced neuromorphic computing and photonic circuits.
Area of Science:
- Materials Science
- Neuroscience
- Computer Engineering
Background:
- Neuromorphic devices, inspired by biological neural systems, are crucial for advancing computing paradigms.
- Synapses are fundamental components of neuromorphic computing, driving significant research interest.
- Developing efficient artificial synapses is key to realizing next-generation computing.
Purpose of the Study:
- To propose and investigate a novel three-terminal transistor for emulating biological synapse functions.
- To explore the optoelectronic properties of a transition metal sulfide and zinc oxide heterojunction for synaptic applications.
- To demonstrate the device's capability in mimicking essential synaptic behaviors and its potential in optoelectronic interfaces.
Main Methods:
- Fabrication of a three-terminal transistor using a transition metal sulfide and zinc oxide heterojunction.
- Characterization of the transistor's electrical properties, including ON/OFF ratio and rectification.
- Evaluation of synaptic behaviors like excitatory postsynaptic current and paired-pulse facilitation.
- Investigation of the device's response to illumination and its impact on synaptic functions.
Main Results:
- The proposed transistor demonstrated a high ON/OFF ratio (10^4) and significant rectifying behavior (10^4).
- The device successfully emulated key synaptic functions: excitatory postsynaptic current, synaptic weight modulation, and paired-pulse facilitation.
- Optoelectronic modulation was observed, with current under illumination being ~10 times greater than in the dark, affecting transfer curves and post-synapse current.
- The device exhibits combined photonic and electric neuromorphic functions.
Conclusions:
- The developed optoelectronic synapse shows promise for integrated photonic circuits and mixed-mode electro-optical operations.
- This work opens new avenues for 2D-material electronics in neuro-electronics applications.
- The findings encourage further research into hybrid optoelectronic neuromorphic devices.
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