A single n-type semiconducting polymer-based photo-electrochemical transistor

Area of Science:

• Organic Electronics
• Bioelectronics
• Materials Science

Background:

• Conjugated polymer films conduct ionic and electronic charges, crucial for soft electronics.
• The interplay between light absorption and mixed conductivity in biological media is not fully exploited.
• A single polymer film for solar-switchable, reversible, redox-free organic bioelectronic circuits is lacking.

Purpose of the Study:

• To demonstrate a light-responsive conjugated polymer film for bioelectronic circuits.
• To develop a solar-switchable organic bioelectronic circuit (OPECT) for potentiometric photodetection and current modulation.
• To explore applications in biomedical devices.

Main Methods:

• Fabrication of an electron and cation-transporting conjugated polymer film.
• Characterization of light-induced reversible modulation of electrochemical potential and conductivity.
• Design and testing of an n-type photo-electrochemical transistor (n-OPECT).

Main Results:

• Light absorption reversibly modulates the polymer film's electrochemical potential and conductivity.
• The developed n-OPECT mimics gate voltage control through light intensity modulation.
• The micron-scale n-OPECT shows high signal-to-noise ratio and sensitivity to low light.

Conclusions:

• The n-OPECT platform offers a novel approach for light-controlled bioelectronic circuits.
• Demonstrated applications include photoplethysmogram recording, light-controlled inverter circuits, and artificial synapses.
• This technology is suitable for various biomedical applications sensitive to light intensity changes.