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Published on: February 4, 2018
High-gain and broadband in vivo amplifiers enabled by matched materials
Yuting Zheng1, Qi Li1, Xinyue Wang2
1Engineering Research Center of Ministry of Education for Adaptive Biomaterials and Medical Devices, School of Materials Science and Engineering, Peking University, Beijing, China.
Nature Communications
|July 16, 2026
Summary
This study introduces organic electrochemical transistor (OECT) circuits for in-sensor biosignal amplification. A novel complementary OECT design achieves high gain and low power, demonstrating effective in vivo signal amplification.
Area of Science:
- Organic electronics
- Biosensors
- Integrated circuits
Background:
- In-sensor biosignal amplification is crucial for advanced bioelectronic devices.
- Organic electrochemical transistors (OECTs) offer low-voltage operation and biological compatibility.
- Understanding OECT material-circuit design principles is key for high-performance amplifiers.
Purpose of the Study:
- To elucidate design principles for high-performance OECT-based amplifiers.
- To demonstrate in-sensor amplification capabilities using complementary OECT circuits.
- To establish a material-device-circuit framework for OECT amplifier design.
Main Methods:
- Development of a high-performance n-type polymer, P(lgFTDPP-2FT).
- Integration of the n-type polymer with a complementary p-type DPP polymer to form an inverter-based amplifier.
- Characterization of amplifier performance, including gain, bandwidth, and power consumption.
- In vivo testing of the OECT amplifier with mouse electrocorticographic (ECoG) signals.
Main Results:
- Achieved high voltage gain (>800 V/V) at low operating voltage (0.6 V).
- Demonstrated a wide bandwidth (>600 Hz) and ultralow power consumption (down to 0.57 nW at 0.2 V).
- Successfully amplified mouse ECoG signals in vivo with superior signal quality and good biocompatibility.
Conclusions:
- Established a matched n-p material system for complementary OECT circuits.
- Provided general design guidelines for developing high-performance OECT-based amplifiers.
- Highlighted the potential of OECTs for advanced in-sensor biosignal processing applications.
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