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Organic Synaptic Transistors Exhibiting Interface Photoisomerizable Effect with Enhanced UV-NIR Response and
Zechen Liang1, Jingpeng Wu1, Xian Tang1
1Frontier Institute of Science and Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 712046, China.
ACS Applied Materials & Interfaces
|October 4, 2025
Summary
Researchers developed a novel organic synaptic transistor using spiropyran and PVP. This device shows broadband light response and bidirectional synaptic modulation, crucial for advanced neuromorphic computing and simulations.
Area of Science:
- Materials Science
- Electronics
- Neuroscience
Background:
- Neuromorphic devices aim to overcome limitations of traditional von Neumann architectures.
- Organic field-effect transistors (OFETs) are explored for neuromorphic computing due to their potential for multifunctional simulations.
- Existing synaptic transistors often lack broadband light response and struggle with bidirectional (excitatory/inhibitory) optical modulation in unipolar devices.
Purpose of the Study:
- To develop an organic synaptic transistor with enhanced broadband light responsivity.
- To achieve bidirectional optical modulation (excitatory/inhibitory) in a unipolar device.
- To explore applications in neuromorphic computing, multispectral imaging, and dynamic image encryption.
Main Methods:
- Fabrication of an organic synaptic transistor utilizing a blended interface modification layer of spiropyran (SP) and poly(4-vinylphenol) (PVP).
- Characterization of the device's photoresponse across a broad spectrum (UV to NIR).
- Demonstration of bidirectional synaptic modulation through gate voltage control exploiting voltage-dependent photogenerated zwitterions.
Main Results:
- The fabricated device exhibits enhanced broadband responsivity from UV to NIR.
- Achieved ultralow electrical energy consumption (0.104 fJ/spike).
- Successfully demonstrated bidirectional synaptic modulation (excitatory and inhibitory) in a unipolar transistor via gate voltage control.
Conclusions:
- The SP and PVP blended interface enables enhanced broadband optical responsiveness and ultralow energy consumption in organic synaptic transistors.
- The developed strategy allows for bidirectional synaptic modulation in unipolar devices, opening new avenues for optical control.
- This work presents an accessible method for creating advanced organic synaptic transistors for diverse neuromorphic applications and dynamic image encryption.
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