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Summary: In this work, an electronic/optoelectronic memory device based on tellurium-based 2D van der Waals heterostructure is reported. It features both long-term and short-term memory behaviors using electrical and optical pulses in the short-wave infrared (SWIR) region. This device enables a fully memristive in-sensor RC system for optical fiber signal processing.
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Summary: Van der Waals ferroelectrics have stable layered structures with strong intralayer forces and weak interlayer forces. They are easily stackable and can be integrated with different materials without interfacial issues. This review discusses the experimentally verified van der Waals ferroelectrics, their unique characteristics, and their potential applications in post-Moore's law electronics.
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Sifan Li et al.
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Prashant Singh et al.
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Mei Er Pam et al.
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Chemistry, Physical
Jongmin Park et al.
Summary: In this study, we developed a W/HfO2/TiN vertical resistive random-access memory (VRRAM) for neuromorphic computing. The basic electrical properties, conduction mechanism, and current behavior relative to temperature were investigated. The practicality of the device was evaluated using a convolutional neural network, and 8-bit reservoir computing with higher efficiency was achieved.
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Tingting Jia et al.
Summary: This study evaluates the ferroelectric and electric properties of the two-dimensional van der Waals material CuInP2S6, and finds that defects in local regions lead to ferroelectric phase transition. The electrochemical strain microscopy reveals different responses between Cu ions and IPS ionospheres, and proposes an interfacial Schottky barrier mechanism for dynamic control of current flow.
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Shun Wang et al.
Summary: This study investigates the application of transition metal thiophosphate material CuInP2S6 (CIPS) in photoelectrochemical water splitting. Through photoassisted acid oxidation, chemically driven oxygen incorporation is achieved, leading to an enhanced photocurrent density of CIPS. The mechanism of oxygen doping is revealed, and a strategy for improving the photoelectrocatalytic performance of similar materials is proposed.
ACS APPLIED MATERIALS & INTERFACES
(2022)
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Marti Checa et al.
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Chemistry, Physical
Dahye Kim et al.
Summary: In this study, a Ni/WOx/ITO-glass memristor device was used to investigate its short-term memory characteristics for reservoir computing systems. The chemical and material compositions of each layer were verified using transmission electron microscopy (TEM) image and X-ray photoelectron spectroscopy (XPS). The device exhibited a characteristic where the current decreased with time but showed a reverse current decay phenomenon. Potentiation and depression data were obtained through modulated pulses and measurement methods, leading to meaningful pattern recognition accuracy. The study also demonstrated that gradual conductance modulation could be controlled through pulse amplitude and time interval between the pulses. Reservoir computing was successfully realized based on the short-term characteristics of the device, with all 16 states of 4 bits being implemented and classified using a simple learning algorithm after reading them with pulses. The study also proposed a method to reduce power consumption in the system.
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Ruofan Du et al.
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Keqin Liu et al.
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NATURE ELECTRONICS
(2022)
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Shuang Zhou et al.
Summary: CuInP2S6 has attracted much attention due to its van der Waals layered structure and robust ferroelectricity at room temperature. This review provides an overview of its various properties, potential applications, and remaining questions and research directions related to this fascinating material and other compounds of the same family.
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(2021)
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Junwei Chu et al.
Summary: The emergence of 2D polarized materials has demonstrated unique quantum behaviors at atomic scales and their applications in information storage and processing have developed significantly in recent years. This review focuses on the basic 2D polarized materials system and their applications in spintronics, valleytronics, and electronics, highlighting the underlying physical mechanisms, symmetry broken theory, and modulation process through heterostructure engineering. These summarized works will continue to enrich the understanding of 2D quantum systems and promising practical applications.
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(2021)
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Dawei Zhang et al.
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Yanan Zhong et al.
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