The ability to simulate biological neurobehavior with electronic devices has now attracted widespread attention. In the past few decades, people have tried a variety of device structures to simulate biological synaptic functions. Due to floating gate thin-film transistors' robust charge blocking and the existence of the tunneling layer, the trapped charge can be stored in a non-volatile manner, which has been considered one of the most suitable device structures for manufacturing artificial synapses. In this work, a photoelectric-stimulated artificial synaptic thin-film transistor was proposed. The MXene and self-assembled titanium dioxide on the surface serves as the floating gate layer and the tunneling layer, respectively. Moreover, the typical synaptic behaviors of synaptic transistors, such as excitatory postsynaptic current and paired-pulse facilitation, have been proven through electrical and optical pulse tests. Finally, through the simulation based on Butterworth's high-pass filter, the input images could be successfully sharpened. The characteristics of these photoelectric synapses reveal the huge potential of this device in neuromorphic vision applications. This work provides a very feasible solution for the application of artificial synaptic devices to image processing and recognition.
Gerile Oudeng,Seema Banerjee,Qin Wang,Ding Jiang,Yadi Fan,Honglian Wu,Feng Pan,Mo Yang
Retinitis pigmentosa is the main cause of inherited human blindness and is associated with dysfunctional photoreceptors (PRs). Compared with traditional methods, optoelectronic stimulation can better preserve the structural integrity and genetic content of the retina. However, enhancing the spatiotemporal accuracy of stimulation is challenging. Quantum dot-doped ZnIn 2 S 4 microflowers (MF) are utilized to construct a biomimetic photoelectric interface with a 0D/3D heterostructure, aiming to restore the light response in PR-degenerative mice. The MF bio interface has dimensions similar to those of natural PRs and can be distributed within the curved spatial region of the retina, mimicking cellular dispersion. The soft 2D nano petals of the MF provide a large specific surface area for photoelectric activation and simulate the flexibility interfacing between cells. This bio interface can selectively restore the light responses of seven types of retina ganglion cells that encode brightness. The distribution of responsive cells forms a pattern similar to that of normal mice, which may reflect the generation of the initial “neural code” in the degenerative retina. Patch-clamp recordings indicate that the bio interface can induce spiking and postsynaptic currents at the single-neuron level. The results will shed light on the development of a potential bionic subretinal prosthetic toolkit for visual function restoration.
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