InP Quantum Dots Tailored Oxide Thin Film Phototransistor for Bioinspired Visual Adaptation

Abstract

The exploration of bionic neuromorphic chips, capable of processing sensory data in a human‐like manner, is both a trend and a challenge. There is a strong demand for phototransistors that offer broadband in‐sensor adaptability. This study introduces a bioinspired vision sensor based on InP quantum dots (QDs)/InSnZnO hybrid phototransistors. This novel design combines the excellent electrical transportation features of oxide semiconductors with the superior optoelectronic response of InP QDs. The resulting hybrid devices exhibit exceptional gate controllability and a robust visible‐light response. These characteristics enable the emulation of multiple functions of the human visual system and the accommodation of varying light intensity environments. Furthermore, the phototransistor array successfully replicates the scotopic and photopic adaptation recognition behaviors of the human retina. Notably, the device demonstrates faultless competency in image processing, achieving an impressive 93% accuracy for digit recognition. These findings contribute to the advancement of bionic neuromorphic chips and offer promising opportunities for future developments in the bioinspired visual system.

Hardware‐Level Image Recognition System Based on ZnO Photo‐Synapse Array with the Self‐Denoising Function

“…[74] This dark adaptation behavior of the visual synapse demonstrates its ability to accumulate weak signals multiple times, achieving reliable classification and recognition of objects. [75] We verified the dark adaptation behavior of ZnO photo-synapse, as shown in Figure 2f. The EPSC under seven consecutive low-intensity light pulses (0.5 mW cm −2 ) reached the same value as that under a single high-intensity light pulse (1.5 mW cm −2 ).…”

Enhancement-Mode Carbon Nanotube Optoelectronic Synaptic Transistors with Large and Controllable Threshold Voltage Modulation Window for Broadband Flexible Vision Systems

“…Light adaptation refers to the photosensitivity and visual recovery behavior of the eyeball when transitioning from a dark to a bright environment, while dark adaptation is opposite to light adaptation. 70 The visual adaptation always follows Weber's law, which expresses the relationship between stimulus intensity and perception intensity. 71 At present, the excellent work of visual adaptation simulation and image perception of device arrays have been reported by adjusting gate voltage to channel current level under different incident power densities.…”

“…During the operation of the human eye, adaptive behaviors of the eyeball are triggered by changes in ambient light, including light adaptation, dark adaptation, and others. Light adaptation refers to the photosensitivity and visual recovery behavior of the eyeball when transitioning from a dark to a bright environment, while dark adaptation is opposite to light adaptation . The visual adaptation always follows Weber’s law, which expresses the relationship between stimulus intensity and perception intensity .…”

Heterostructure-Based Optoelectronic Neuromorphic Devices

“…The combination of electronic devices and their procedures forms an efficient processing information format, similar to the neurons in an organic brain [16][17][18]. This optoelectronic device, alongside artificial intelligence, provides both optical and electronic advantages within a single device to enhance adaptability, reconstruct images, and process information efficiently [19]. Furthermore, light provides the advantage of generating a wide range of light pulses based on wavelength, making it highly suitable for synaptic stimulation control inputs.…”