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Multifunctional Electronics Enabled by Ion-Based Organic Electrochemical Transistor with Large Threshold Voltage
Zhongliang Zhou1, Qiang He1, Cindy G Tang1,2
1School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
ACS Nano
|October 27, 2025
Summary
Researchers tuned organic electrochemical transistors (OECTs) by selecting different anions. This anion selection enabled dynamic threshold voltage shifts, enhancing OECTs for bioelectronics and neuromorphic computing applications.
Area of Science:
- Materials Science
- Organic Electronics
- Bioelectronics
Background:
- Organic electrochemical transistors (OECTs) are crucial for bioelectronics, wearables, and neuromorphic computing due to their high transconductance and low power needs.
- Controlling threshold voltage (Vth) in OECTs is vital for power efficiency, noise reduction, and enabling complex functionalities like artificial neurons.
- Stable doping/dedoping of conjugated polymers in aqueous electrolytes remains a challenge for OECTs.
Purpose of the Study:
- To demonstrate anion selection as a method for tuning the threshold voltage (Vth) of organic electrochemical transistors (OECTs).
- To achieve dynamic Vth tunability in OECTs for multifunctional device operation.
- To advance OECT performance for applications in bioelectronics and neuromorphic systems.
Main Methods:
- Utilized different anions to modulate the threshold voltage (Vth) of organic electrochemical transistors (OECTs).
- Evaluated OECT performance metrics including transconductance, ON/OFF ratio, and cycling stability.
- Fabricated and tested OECT-based devices such as amplifiers, inverters, and artificial spiking neurons.
Main Results:
- Achieved a threshold voltage (Vth) shift from -0.16 V to +0.29 V using different anions.
- Maintained high transconductance (>7 mS), high ON/OFF ratio (>10^5), and negligible degradation over 10,000 cycles.
- Demonstrated multifunctional devices including a zero-gate biased amplifier, complementary inverters, and artificial spiking neurons.
Conclusions:
- Anion selection provides a straightforward and effective method for tailoring OECT threshold voltage (Vth).
- Dynamic Vth tunability enables single OECTs to operate in multiple modes, enhancing device versatility.
- This approach significantly advances the development of low-power bioelectronic and neuromorphic systems.
Keywords:
event-driven neuronshigh-performing electrophysiological amplifierorganic electrochemical spiking neuronorganic electrochemical transistorsreversible threshold voltage tuningMore Related Videos
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