Emulating Ebbinghaus forgetting behavior in a neuromorphic device based on 1D supramolecular nanofibres
Emulating Ebbinghaus forgetting behavior in a neuromorphic device based on 1D supramolecular nanofibres
Mimicking synaptic functions in hardware devices is a crucial step in realizing brain-like
computing beyond the von Neumann architecture. 1D nanomaterials with spatial extensions
of a few µm, similar to biological neurons, gain significance given the ease of electrical
transport as well as directionality. Herein, we have reported a two-terminal optically active
device based on 1D supramolecular nanofibres consisting of CS (coronene tetracarboxylate)
and DMV (dimethyl viologen) forming alternating D–A donor–acceptor) pairs. These fibres
self-assemble from water, are simple to process without much dependence on lithography,
enable miniaturization, reduce carrier scattering, and increase charge transport. They undergo
self-repair with exposure to humidity, a property that may play an important role in
integration. Thus, the nanofibre device has been fabricated to emulate synaptic functions such
as the STP (short-term potentiation), LTP (long-term potentiation), PPF (paired-pulse
facilitation), STDP (spike-time dependent plasticity) and learning–relearning behaviors. In
addition, an extensive study on the less explored Ebbinghaus forgetting curve has been
carried out. The supramolecular nanofibres being light sensitive, the potential of the device as
a visual system is demonstrated using a 3 × 3 pixel array.
