Helical Nanofiber Photoelectric Synaptic Devices for an Artificial Vision Nervous System

Abstract

Inspired by the helical structure and the resultant exquisite functions of biomolecules, helical polymers have received increasing attention. Here, a series of poly(3-hexylthiophene)-blockpoly(phenyl isocyanide) (P3HT-b-PPI) copolymers were prepared using a simple one-pot living polymerization method. Interestingly, the P3HT 80 -b-PPI 30 films were found to have a helical nanofiber structure. The corresponding device has superior optoelectronic properties, such as a broadened spectral response range from the visible band to the deep ultraviolet (DUV) and an approximately 5-fold longer carrier decay time after DUV light stimulation. An energy consumption of 1.44 fJ per synaptic event was obtained, which is the lowest energy consumption achieved so far with DUV light stimulation. The encryption and decryption of images are implemented using an array of devices. Finally, a photoreceptor neural pathway was constructed to achieve early warning for the recognition of the display of harmful light. This research provides an effective strategy for the development of a novel optoelectronic synaptic device.

Dual‐Mode Conversion of Photodetector and Neuromorphic Vision Sensor via Bias Voltage Regulation on a Single Device

“…Based on the unique design of our device structure, the lowest power consumption of our device is as minimal as 584 pJ per event (Figure 4j) according to the equation of E = I peak × V × t, where I peak , V, and t represent the maximum photoresponse current, operating voltage, and light pulse duration, respectively. Although this value obtained at 5 V is lower than conventional CMOS and most of the reported neuromorphic devices (Figure 4k and Table S3, Supporting Information), [66][67][68][69][70][71] it is still higher than biological synapses and some devices with ultra-low power consumption [72][73][74][75][76] due to the high bias voltage and photocurrent. Therefore, in terms of power consumption, it may be more advantageous in reducing power consumption if the device can act as an NVS at low voltages.…”

Highly Stretchable and Oriented Wafer-Scale Semiconductor Films for Organic Phototransistor Arrays

“…Inspired by biological vision systems, retina-like photodetectors that mimic the structural and functional features of human retinas have attracted widespread attention. − It not only makes it possible for some blind people to regain vision but also enhances human vision by multifunctional photodetectors such as the retina. , Importantly, the bioinspired photodetectors are required to be similar to the curvature of the human retinas to perceive external light signals. , There are primarily two strategies to construct these photodetectors containing micronano devices. One is the direct manufacturing of micronano devices on curved support substrates, which requires addressing significant technical challenges. − Another method possesses two steps; the first step is to place initially manufactured micronano devices on a flexible planar substrate.…”

Organic Heterojunction Phototransistors with Bi‐Directional Photoresponse for Vision Biomimetics

“…[9,10] The use of intelligent photoelectronic devices to complete visual bionics is conducive to the future development of visual prostheses and artificial intelligence, which is critical to the long-term and stable development of human beings. [11][12][13] Organic ambipolar transistors have attracted much attention due to their ability to combine p-type and n-type electrical properties into a single device. [14][15][16] The construction of a heterostructure channel layer using p-type and n-type semiconductor materials can realize the dual channel transmission of holes and electrons while also allowing for the controllable adjustment of bidirectional photoresponse under light illumination.…”