Photoelectric Visual Adaptation Based on 0D‐CsPbBr₃‐Quantum‐Dots/2D‐MoS₂ Mixed‐Dimensional Heterojunction Transistor

Abstract

Adaptation is the most common and basic feature of living systems, which gives species or individuals a survival advantage. In particular, visual adaptation can enable organisms with a clearer understanding of the real world, thereby avoiding potential harm, which is vital for the life activities of organisms. However, current adaptive devices based on logic circuits are still facing the great challenges for large-scale integration and limited bionic functions. Therefore, the hardware impleofmentation of biological visual adaptability through the emerging photoelectric devices may provide a great opportunity for the bionic systems facing complex environments. Here, a novel adaptive device based on a mixed-dimensional van der Waals heterostructure is fabricated by using a gate-modulated 0D-CsPbBr 3-quantum-dots/2D-MoS 2 heterostructure. The device has superior electric adaptabilities and excellent optical absorption abilities owing to its special energy-band structure. The key characteristics of biological adaptation, such as accuracy, sensitivity, inactivation, and desensitization behaviors, are successfully emulated in the device based on the unique trapping-detrapping mechanism. Most importantly, with a photoelectric synergy approach, the fascinating visual adaptation function based on an environment-adjustable threshold is finally demonstrated. These results indicate that the proposed device may be very promising for the future applications of artificial visual systems and intelligent bionic robots.

Lead‐Free Perovskites‐Based Photonic Synaptic Devices with Logic Functions

“…Metal halide perovskites (MHPs) have been used as active materials in photonic synaptic devices owing to their remarkable advantages such as long carrier lifetime, high light absorption coefficient, and facile solution process. [17][18][19][20] Recently reported perovskite-based photonic synaptic devices have mainly focused on multiple materials system [21,22] or multilayered structure, [23,24] thereby inevitably increasing the cost and complexity of device fabrication. In addition, lead-based perovskites such as CsPbBr 3 , [25] CsPbCl 3 , [26] CH 3 NH 3 PbBr 3 , [27] etc., have been used in devices, but the inherent toxicity of lead may lead to environment problems.…”

Optoelectronic Synapses Based on Photo‐Induced Doping in MoS2/h‐BN Field‐Effect Transistors

“…demonstrated an optoelectronic visual adaptive device with gate‐modulated 0D‐CsPbBr 3 ‐QDs/2D‐MoS 2 mixed‐dimensional van der Waals heterostructures. [ 20 ] Such devices can successfully mimic a series of important adaptive functions.…”

Recent Progress in Anisotropic 2D Semiconductors: From Material Properties to Photoelectric Detection

“…Many examples demonstrated clearly the value of optoelectronic devices in achieving polarized light detection with anisotropic 2D materials. [ 25–29 ] In the past few years, broadband photodetector is becoming increasingly popular due to its widespread application including polarization imaging technique, [ 30–32 ] optical communication, [ 33,34 ] infrared remote sensing, [ 35 ] and so on. However, more recently, anisotropic 2D devices have been proposed for the detection of polarized light that can be regarded as the next‐generation photodetectors.…”