Data from: Tunable anti-ambipolar vertical bilayer organic electrochemical transistor enable neuromorphic retinal pathway

Increasing demand for bio-interfaced human-machine interfaces propels the
development of organic neuromorphic electronics with small form factors
leveraging both ionic and electronic processes. Ion-based organic
electrochemical transistors (OECTs) showing anti-ambipolarity (OFF-ON-OFF
states) reduce the complexity and size of bio-realistic Hodgkin-Huxley(HH)
spiking circuits and logic circuits.  However, limited stable
anti-ambipolar organic materials prevent the design of integrated,
tunable, and multifunctional neuromorphic and logic-based systems. In this
work, a general approach for tuning anti-ambipolar characteristics is
presented through assembly of a p-n bilayer in a vertical OECT (vOECT)
architecture. The vertical OECT design reduces device footprint, while the
bilayer material tuning controls the anti-ambipolarity characteristics,
allowing control of the device’s on and off threshold voltages, and peak
position, while reducing size thereby enabling tunable threshold spiking
neurons and logic gates. Combining these components, a mimic of the
retinal pathway reproducing the wavelength and light intensity encoding of
horizontal cells to spiking retinal ganglion cells is demonstrated. This
work enables further incorporation of conformable and adaptive OECT
electronics into biointegrated devices featuring sensory coding through
parallel processing for diverse artificial intelligence and computing
applications.