“…Boron‐doped Si nanocrystals were also utilized by Yin et al to design optically‐stimulated transistors to emulate demanded essential synaptic functionalities, such as EPSC (IPSC), PPF, STDP, the simulation of aversion learning and the logic functions . Figure a demonstrates the structure of the synaptic phototransistor and boron‐doped Si nanocrystals film, which is served as the channel of the synaptic phototransistor, is about 647 nm thickness.…”
Implementing synaptic functions with electronic devices is critical to achieve neuromorphic systems on the hardware platform, as synapses play important roles in brain computing and memory. Synapses modulated by light signals, which are also referred as photonic synapses, can not only make effective use of the outstanding properties of light to provide devices with ultrahigh propagation speed, high bandwidth and low crosstalk but also provide a noncontact writing method, which can facilitate the evolution of optical wireless communication and operation. More importantly, real‐time image processing can also be performed by photonic synapses which possess temporary memory. Thus far, tremendous efforts have been taken to design and fabricate photonic synapses. Herein, a summary of the development of different kinds of emerging materials utilized in photonic synaptic devices including memristors, field‐effect transistors, and phase change memory is presented, followed by the innovative applications of photonic synapses for neuromorphic systems. Finally, some current challenges and future study directions are discussed.
“…Boron‐doped Si nanocrystals were also utilized by Yin et al to design optically‐stimulated transistors to emulate demanded essential synaptic functionalities, such as EPSC (IPSC), PPF, STDP, the simulation of aversion learning and the logic functions . Figure a demonstrates the structure of the synaptic phototransistor and boron‐doped Si nanocrystals film, which is served as the channel of the synaptic phototransistor, is about 647 nm thickness.…”
Implementing synaptic functions with electronic devices is critical to achieve neuromorphic systems on the hardware platform, as synapses play important roles in brain computing and memory. Synapses modulated by light signals, which are also referred as photonic synapses, can not only make effective use of the outstanding properties of light to provide devices with ultrahigh propagation speed, high bandwidth and low crosstalk but also provide a noncontact writing method, which can facilitate the evolution of optical wireless communication and operation. More importantly, real‐time image processing can also be performed by photonic synapses which possess temporary memory. Thus far, tremendous efforts have been taken to design and fabricate photonic synapses. Herein, a summary of the development of different kinds of emerging materials utilized in photonic synaptic devices including memristors, field‐effect transistors, and phase change memory is presented, followed by the innovative applications of photonic synapses for neuromorphic systems. Finally, some current challenges and future study directions are discussed.
Silicon-based inorganic-organic hybrid optoelectronic synaptic devices simulating cross-modal learning SCIENCE CHINA Information Sciences Recent multiple evidences for high stability of perovskite optoelectronic devices Science Bulletin 64, 1731 (2019); Recent progress in devices and circuits based on wafer-scale transitionmetal dichalcogenides SCIENCE CHINA Information Sciences 62, 220401 (2019); Recent progress in ZnO-based heterojunction ultraviolet light-emitting devices
Neuromorphic computing has been extensively studied to mimic the brain functions of perception, learning, and memory because it may overcome the von Neumann bottleneck. Here, with the light‐induced bidirectional photoresponse of the proposed Bi2O2Se/graphene hybrid structure, its potential use in next‐generation neuromorphic hardware is examined with three distinct optoelectronic applications. First, a photodetector based on a Bi2O2Se/graphene hybrid structure presents positive and negative photoresponsibility of 88 and −110 A W−1 achieved by the excitation of visible wavelength and ultraviolet wavelength light at intensities of 1.2 and 0.3 mW cm−2, respectively. Second, this unique photoresponse contributes to the realization of all optically stimulated long‐term potentiation or long‐term depression to mimic synaptic short‐term plasticity and long‐term plasticity, which are attributed to the combined effect of photoconductivity, bolometric, and photoinduced desorption. Third, the devices are applied to perform digital logic functions, such as “AND” and “OR,” using full light modulation. The proposed Bi2O2Se/graphene‐based optoelectronic device represents an innovative and efficient building block for the development of future multifunctional artificial neuromorphic systems.
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