Biomimetic Artificial Tetrachromatic Photoreceptors Based on Fully Light‐Controlled 2D Transistors

Abstract

Artificial photoreceptors offer a promising solution for developing biomimetic vision systems that incorporate in‐sensor processing, which can greatly reduce power consumption and operation latency compared to traditional machine vision systems. This work presents a tetrachromatic optical synaptic device based on a 2D tungsten diselenide optoelectronic p‐type transistor with a unique UV light‐activated surface electron doping layer. Fully light‐controlled bidirectional synaptic excitation and inhibition are demonstrated with visible and UV light stimuli, respectively, with a reasonable power density of <10 mW cm−2 that matches the imaging condition of a biological vision. The weight updates of up to 64 states, high dynamic range, and low nonlinearity are demonstrated for long‐term potentiation and depression behaviors. This artificial tetrachromatic photoreceptor can mimic the alert and foraging behaviors of a reindeer with low power consumption and enhanced signal contrast. Furthermore, it can be employed as an intelligent collision detection solution with in‐sensor processing capabilities. This bioinspired tetrachromatic photoreceptor offers a low‐cost, energy‐efficient, and low‐latency solution for future artificial machines.

Tailoring Wavelength-Adaptive Visual Neuroplasticity Transitions of Synaptic Transistors Comprising Rod-Coil Block Copolymers for Dual-Mode Photoswitchable Learning/Forgetting Neural Functions

“…Table summarizes the synaptic performance of the proposed photosynapse with its counterparts in fully light-controlled artificial synapses and memory devices. Overall, the proposed BCP-based photosynapses have decent PPF indices, which can compete with their inorganic counterparts under ultralow optical pulse widths. ,,,– This is one of the few works that can exhibit long-term memory behaviors with fully light-controlled modes. ,, Notably, this is the first work to demonstrate fully light-controlled short- and long-term memory based on organic material systems. These results underline the feasibility of employing the BCP photosynapses in real-time artificial visual devices and broaden their horizons for state-of-the-art high-speed image processing/memory systems utilizing all-optical operations.…”

Schottky barrier reduction on optoelectronic responses in heavy ion irradiated WSe2 memtransistors

“…In most of the reported optoelectronic nerve synaptic devices, light has been used as the stimulus input signal. 13,59–62 Light stimuli triggers photogenerated carriers in CVD-grown MoS 2 films with intrinsic defects, which can mimic the phototransduction process of the retina. 63 We then demonstrated the effects of SHI irradiation on the synaptic characteristics of WSe 2 devices.…”