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Chen JB, Zhang K, Jiang ZJ, Gao LY, Xu JW, Chen JT, Zhao Y, Li Y, Wang CW. Cu xS nanosheets with controllable morphology and alignment for memristor devices. NANOTECHNOLOGY 2022; 33:245204. [PMID: 35272277 DOI: 10.1088/1361-6528/ac5ca4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 03/10/2022] [Indexed: 06/14/2023]
Abstract
In electrochemical metallization memristor, the performance of resistive switching (RS) is influenced by the forming and fusing of conductive filaments within the dielectric layer. However, the growth of filaments, mostly, is unpredictable and uncontrollable. For this reason, to optimize ions migration paths in the dielectric layer itself in the Al/CuxS/Cu structure, uniform CuxS nanosheets films have been synthesized using anodization for various time spans. And the Al/CuxS/Cu devices show a low operating voltage of less than 0.3 V and stable RS performance. At the same time, a reversible negative differential resistance (NDR) behavior is also demonstrated. And then, the mechanism of repeatable coexistence of RS effect and NDR phenomenon is investigated exhaustively. Analyses suggest that the combined physical model of space-charge limited conduction mechanism and conductive filaments bias-induced migration of Cu ions within the CuxS dielectric layer is responsible for the RS operation, meanwhile, a Schottky barrier caused by copper vacancy at the CuxS/Cu interface is demonstrated to explain the NDR phenomenon. This work will develop a new way to optimize the performance of non-volatile memory with multiple physical attributes in the future.
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Affiliation(s)
- Jian Biao Chen
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Kai Zhang
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Zi Jin Jiang
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Li Ye Gao
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Jiang Wen Xu
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Jiang Tao Chen
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Yun Zhao
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Yan Li
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Cheng Wei Wang
- Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
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Molecular Insight into the Deformation of Single Crystal Copper Loaded by High-Speed Shock Wave. METALS 2021. [DOI: 10.3390/met11030446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Molecular dynamics simulations were performed to study the evolution of single crystal copper with and without a nanovoid (located at the middle of crystal with a diameter of ~2.9 nm) when loaded with shock waves of different velocities. The simulation results show that the average particle velocity of single crystal copper linearly relates to the velocity of the loaded shock wave for both the systems (crystal with and without a nanovoid). When loaded by the shock wave, the equilibrated temperature and pressure of the system with a nanovoid are found to be slightly larger than those of the system without the nanovoid, while the volume of the system with the nanovoid is found to be lower than that of the void-free system. The single crystal copper undergoes a phase transition from face-centered cubic (FCC) to hexagonal-close packed (HCP) and a dislocation structure forms around the nanovoid. The existence of a nanovoid can induce the rearrangement and deformation of the crystalline structure and eventually lead to the plastic deformation of the system. This work provides molecular-level insight into the effect of nanovoids on the shock plasticity of metals, which can aid in the ultimate application of the control of material structure damage in shock-wave propagation.
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Li M, Xia Y, Luo Y, Zhong Y, Cui J. Cation vacancy related crystal structure and bandgap and their effects on the thermoelectric performance of Cu-ternary systems Cu 3+δIn 5Te 9 ( δ = 0–0.175). Phys Chem Chem Phys 2020; 22:7004-7011. [DOI: 10.1039/d0cp00626b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fundamental impact of the crystal distortion (CD) on the lattice part (κL) has been revealed in the Cu3In5Te9-based ternary system.
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Affiliation(s)
- Min Li
- School of Materials & Chemical Engineering
- Ningbo University of Technology
- Ningbo 315211
- China
- Materials Science and Engineering College
| | - Yafen Xia
- Commercial School
- Zhejiang Fashion Institute of Technology
- Ningbo 315211
- China
| | - Yong Luo
- Materials Science and Engineering College
- China University of Mining and Technology
- Xuzhou 221116
- China
| | - Yaqiong Zhong
- School of Materials & Chemical Engineering
- Ningbo University of Technology
- Ningbo 315211
- China
- Materials Science and Engineering College
| | - Jiaolin Cui
- School of Materials & Chemical Engineering
- Ningbo University of Technology
- Ningbo 315211
- China
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