Researchers from the Beijing Institute of Technology, Peking University and Japan’s National Institute for Materials Science have developed a few-layer graphene/CrOCl/few-layer graphene van der Waals (vdW) heterostructure that functions as a broadband infrared optoelectronic synaptic device, notable for its tunable spike timing-dependent plasticity and a broad spectral response range of 520–2000 nanometers. This system addresses the limitations of conventional 2D synaptic devices, which are typically restricted to visible light due to their material bandgaps.
The device is composed of two thin graphene layers separated by a chromium oxychloride (CrOCl) barrier, all encapsulated in hexagonal boron nitride for stability. When a voltage is applied, electrons tunnel through the CrOCl layer, even in the absence of light—a behavior distinct from metal-contact devices. Upon illumination (including infrared wavelengths), interfacial coupling drives charge transfer from graphene to CrOCl, modulating the tunneling barrier and triggering synaptic plasticity effects, such as spike-number and frequency-dependent plasticity.
Researchers from the Beijing Institute of Technology, Peking University and Japan’s National Institute for Materials Science have developed a few-layer graphene/CrOCl/few-layer graphene van der Waals (vdW) heterostructure that functions as a broadband infrared optoelectronic synaptic device, notable for its tunable spike timing-dependent plasticity and a broad spectral response range of 520–2000 nanometers. This system addresses the limitations of conventional 2D synaptic devices, which are typically restricted to visible light due to their material bandgaps.
The device is composed of two thin graphene layers separated by a chromium oxychloride (CrOCl) barrier, all encapsulated in hexagonal boron nitride for stability. When a voltage is applied, electrons tunnel through the CrOCl layer, even in the absence of light—a behavior distinct from metal-contact devices. Upon illumination (including infrared wavelengths), interfacial coupling drives charge transfer from graphene to CrOCl, modulating the tunneling barrier and triggering synaptic plasticity effects, such as spike-number and frequency-dependent plasticity.
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