A photoelectric synapse based on optimized perovskite CH3NH3PbBr3 quantum dot film detectors

Abstract

In this work, we report a high-performance photodetector based on perovskite CH3NH3PbBr3 quantum dots (QDs) films with a configuration of Au/CH3NH3PbBr3 QDs-Al2O3-indium tin oxide/Au as a bioinspired photoelectric synapse. The uniform CH3NH3PbBr3 QDs thin film is fabricated by a electrodepositing QDs solution and exhibits favorable long-term stability at ambient. By inserting an Al2O3 film, the dark current of the QDs film photodetectors is significantly suppressed as a result of the blocking effect, accompanied by the enhanced ON/OFF ratio. Furthermore, the optimal photodetector is utilized as a photoelectric synapse. Through modulating the light pulse stimuli, some underlying synaptic functions, including paired-pulse facilitation, axon-multi-synapses network function, and the transformation from short-term plasticity to long-term plasticity, are flexibly emulated on a single photoelectric synapse. These remarkable results are promising for building hardware units with neuromorphic architecture to mimic the human brain functionalities.

Tin Doping Induced High‐Performance Solution‐Processed Ga2O3 Photosensor toward Neuromorphic Visual System

“…To date, photosensors composed of a variety of photosensitive nanomaterials including metal oxides, chalcogenides, and perovskites have been used to construct NVSs. [9,10] Wide band gap metal oxides, such as indium gallium zinc oxide and zinc oxide are commonly used owing to their high transparency to visible light, low energy consumption, balanced photoresponse, material workability, and tunability of dopants and carrier transport. [11] Recently, Ga 2 O 3 based photosensors have drawn considerable interest for emulation of photonic synapses based on features including: i) oxygen vacancy defects with low theoretical formation energies that enable control over photo-generated current relaxation times and long-term retention characteristics.…”

A Light‐Stimulus Flexible Synaptic Transistor Based on Ion‐Gel Side‐Gated Graphene for Neuromorphic Computing

“…Recently, the rapid development of optogenetic technology has inspired researchers to use lights as stimulus signals. [31][32][33] Biologically speaking, optogenetic technology is that the activity of neurons can be activated or inhibited by light acting on the channel proteins. [34,35] J. Jiang et al had fabricated MoS 2 photoelectric synaptic transistor gated based on biopolymer electrolyte (sodium alginate), which realized synaptic enhancement and inhibitory filtering functions from short-term synaptic plasticity (STP), and successfully simulated non-Hebb rule and Hebb rule.…”