Optoelectronic synaptic devices integrating light-perception and signal-storage functions hold great potential in neuromorphic computing for visual information processing, as well as complex brain-like learning, memorizing, and reasoning. Herein, the successful growth of MoS 2 monolayer arrays assisted by gold nanorods guided precursor nucleation is demonstrated. Optical, spectral, and morphology characterizations of MoS 2 prove that arrayed flakes are homogeneous monolayers, and they are further fabricated as optoelectronic devices showing featured photocurrent loops and stable optical responses. Typical synaptic behaviors of photo-induced short-term potentiation, long-term potentiation, and paired pulse facilitation are recorded under different light stimulations of 450, 532, and 633 nm lasers at various excitation powers. A visual sensing system consisting of 5 × 6 pixels is constructed to simulate the light-sensing image mapped by forgetting curves in real time. Moreover, the system presents the ability of utilizing associated images to restore vague and incomplete memories, which successfully mimics human intelligent behaviors of association memory and logical reasoning. The work emulates the brain-like artificial intelligence using arrayed 2D semiconductors, which paves an avenue to achieve smart retina and complex brain-like system.
Advanced display devices acquire higher demands in large color gamut, high color purity, ultrahigh visual resolution, and small size pixel, all-inorganic lead halide perovskite (AILHP) nanocrystals (NCs) possess inherent advantages...
CsPbI3 perovskite quantum dots (QDs) are promising materials for high‐efficiency and low‐cost red fluorophores in advanced display and light‐sensing applications. However, structural and spectral stabilities of CsPbI3 QDs by traditional preparation are seriously broken in water or light environment. Here, a compositional engineering strategy with an additional PbI2‐recondition process to synthesize highly‐stable CsPbBr1.2I1.8 @ SiO2 QDs is demonstrated. Time‐ and temperature‐dependent photoluminescence and Raman measurements prove that spectral stability and exciton binding energy of QDs are greatly improved within this strategy. Notably, high‐resolution structure characterizations, point‐to‐point diffraction patterns and line‐scanning of element distributions provide strong and direct evidence at atomic‐level to reveal that PbI2‐recondition can repair defects well, which helps to construct perfect lattices and homogeneous SiO2 passivation layers to prevent the surface bonding of molecules. Moreover, our red perovskite QDs are further designed to prepare various anti‐counterfeiting labels as multi‐scale complex patterns to store and protect information. The proposed recondition strategy explores a new avenue to prepare stable and high‐quality red perovskite QDs for new‐generation lighting and light‐sensing devices.
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