Cataloguing MoSi2N4 and WSi2N4 van der Waals Heterostructures: An Exceptional Material Platform for Excitonic Solar Cell Applications
作者:
Tho, Che Chen;Yu, Chenjiang;Tang, Qin;Wang, Qianqian;Su, Tong;...
期刊:
Advanced Materials Interfaces ,2023年10(2):2201856- ISSN:2196-7350
通讯作者:
Ang, Yee Sin(yeesin_ang@sutd.edu.sg);Wang, Guangzhao(wangyan6930@yznu.edu.cn)
作者机构:
[Wang, Qianqian; Feng, Zhuoer; Ang, Lay Kee; Tho, Che Chen; Su, Tong; Yang, Shengyuan A.; Wu, Qingyun; Ang, Yee Sin] Singapore Univ Technol & Design, Sci Math & Technol Cluster, Singapore 487372, Singapore.;[Wang, Guangzhao; Tang, Qin; Yu, Chenjiang] Yangtze Normal Univ, Sch Elect Informat Engn, Key Lab Extraordinary Bond Engn & Adv Mat Technol, Chongqing 408100, Peoples R China.;[Nguyen, C. V.] Le Quy Don Tech Univ, Dept Mat Sci & Engn, Hanoi 100000, Vietnam.;[Ong, Wee-Liat] Zhejiang Univ, ZJU UIUC Inst, Coll Energy Engn, Haining 314400, Zhejiang, Peoples R China.;[Ong, Wee-Liat] Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China.
通讯机构:
[Guangzhao Wang; Yee Sin Ang; Guangzhao Wang Guangzhao Wang Guangzhao Wang; Yee Sin Ang Yee Sin Ang Yee Sin Ang] S;Science Mathematics and Technology Cluster, Singapore University of Technology and Design, Singapore, 487372 Singapore<&wdkj&>School of Electronic Information Engineering, Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing, Yangtze Normal University, Chongqing, 408100 China
关键词:
2D materials;density functional theory simulations;electrical contacts;excitonic solar cells;van der Waals heterostructures
摘要:
2D materials van der Waals heterostructures (vdWHs) provide a revolutionary route toward high-performance solar energy conversion devices beyond the conventional silicon-based pn junction solar cells. Despite tremendous research progress accomplished in recent years, the searches of vdWHs with exceptional excitonic solar cell conversion efficiency and optical properties remain an open theoretical and experimental quest. Here, this study shows that the vdWH family composed of MoSi2N4 and WSi2N4 monolayers provides a compelling material platform for developing high-performance ultrathin excitonic solar cells and photonics devices. Using first-principle calculations, 51 types of MoSi2N4 and WSi2N4-based [(Mo,W)Si2N4] vdWHs composed of various metallic, semimetallic, semiconducting, insulating, and topological 2D materials are constructed and classified. Intriguingly, MoSi2N4/(InSe, WSe2) are identified as Type II vdWHs with exceptional excitonic solar cell power conversion efficiency reaching well over 20%, which are competitive to state-of-the-art silicon solar cells. The (Mo,W)Si2N4 vdWH family exhibits strong optical absorption in both the visible and UV regimes. Exceedingly large peak UV absorptions over 40%, approaching the maximum absorption limit of a freestanding 2D material, can be achieved in (Mo,W)Si2N4/α2-(Mo,W)Ge2P4 vdWHs. The findings unravel the enormous potential of (Mo,W)Si2N4 vdWHs in designing ultimately compact excitonic solar cell device technology. © 2022 The Authors. Advanced Materials Interfaces published by Wiley-VCH GmbH.
语种:
英文
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Linear analysis of plasma pressure-driven mode in reversed shear cylindrical tokamak plasmas
作者:
Zhang, Ding-Zong;Feng, Xu-Ming;Ma, Jun;Guo, Wen-Feng;Huang, Yan-Qing;...
期刊:
中国物理B ,2023年32(1):449-454 ISSN:1674-1056
通讯作者:
Ma, Jun(junma@ipp.ac.cn);Guo, Wen-Feng(wfguo@ipp.ac.cn)
作者机构:
[Huang, Yan-Qing; Liu, Hong-Bo; Feng, Xu-Ming; Zhang, Ding-Zong] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China.;[Guo, Wen-Feng; Feng, Xu-Ming; Zhang, Ding-Zong; Ma, Jun] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China.
通讯机构:
[Ma, J.; Guo, W.-F.] I;Institute of Plasma Physics, China
关键词:
magnetohydrodynamics (MHD);double tearing mode;pressure-driven mode
摘要:
The linear behavior of the dominant unstable mode (m = 2, n = 1) and its high order harmonics (m = 2n, n ≥ 2) are numerically investigated in a reversed magnetic shear cylindrical plasma with two q = 2 rational surfaces on the basis of the non-reduced magnetohydrodynamics (MHD) equations. The results show that with low beta (beta is defined as the ratio of plasma pressure to magnetic field pressure), the dominant mode is a classical double tearing mode (DTM). However, when the beta is sufficiently large, the mode is driven mainly by plasma pressure. In such a case, both the linear growth rate and mode structures are strongly affected by pressure, while almost independent of the resistivity. This means that the dominant mode undergoes a transition from DTM to pressure-driven mode with the increase of pressure, which is consistent with the experimental result in ASDEX Upgrade. The simulations also show that the distance between two rational surfaces has an important influence on the pressure needed in mode transition. The larger the distance between two rational surfaces, the larger the pressure for driving the mode transition is. Motivated by the phenomena that the high-m modes may dominate over low-m modes at small inter-resonance distance, the high-m modes with different pressures and q profiles are studied too. © 2023 Chinese Physical Society and IOP Publishing Ltd.
语种:
英文
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Engineering Active Iron Sites on Nanoporous Bimetal Phosphide/Nitride Heterostructure Array Enabling Robust Overall Water Splitting
作者:
Xuan Zhou;Yuxue Mo;Fang Yu;Liling Liao;Xinru Yong;...
期刊:
Advanced Functional Materials ,2023年33(6):2209465- ISSN:1616-301X
通讯作者:
Yu, Fang(fyu@hunnu.edu.cn);Zhou, Haiqing(hqzhou@hunnu.edu.cn);Sheng, Tian(tsheng@ahnu.edu.cn)
作者机构:
[Yuxue Mo; Yuxue Mo Yuxue Mo Yuxue Mo] College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang, 421002 P. R. China;[Xuan Zhou; Fang Yu; Liling Liao; Xinru Yong; Fangming Zhang; Dongyang Li; Qian Zhou; Haiqing Zhou; Xuan Zhou Xuan Zhou Xuan Zhou; Fang Yu Fang Yu Fang Yu; Liling Liao Liling Liao Liling Liao; Xinru Yong Xinru Yong Xinru Yong; Fangming Zhang Fangming Zhang Fangming Zhang; Dongyang Li Dongyang Li Dongyang Li; Qian Zhou Qian Zhou Qian Zhou; Haiqing Zhou Haiqing Zhou Haiqing Zhou] Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081 P. R. China;[Tian Sheng; Tian Sheng Tian Sheng Tian Sheng] College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000 P. R. China
通讯机构:
[Fang Yu; Haiqing Zhou; Fang Yu Fang Yu Fang Yu; Haiqing Zhou Haiqing Zhou Haiqing Zhou] K;[Tian Sheng; Tian Sheng Tian Sheng Tian Sheng] C;Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081 P. R. China<&wdkj&>College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000 P. R. China
关键词:
bifunctional water splitting;cobalt nitride;heterostructures;iron phosphide;large current density
摘要:
Self‐supported Fe2P/Co2N porous heterostructure arrays are in situ constructed with abundant iron sites exposing at the surface, which presents superb bifunctional catalytic activity for hydrogen and oxygen evolution reactions in base, substantially expediting the overall water splitting at 500 mA cm−2 with only 1.663 V, prominently superior to IrO2(+)//Pt(−) coupled electrodes and most of non‐noble bifunctional electrocatalysts. Abstract Alkaline water electrolysis is a commercially viable technology for green H2 production using renewable electricity from intermittent solar or wind energy, but very few non‐noble bifunctional catalysts simultaneously exhibit superb catalytic efficiency and stability at large current densities for hydrogen and oxygen evolution reactions (HER and OER, respectively), especially for iron‐based catalysts. Given that iron is the most abundant and least expensive transition metal, iron‐based compounds are very attractive low‐cost targets as active electrocatalysts for bifunctional water splitting with large‐current durability. Herein, the in situ construction of a self‐supported Fe2P/Co2N porous heterostructure arrays possessing superb bifunctional catalytic activity in base is reported, featured by low overpotentials of 131 and 283 mV to attain a current density of 500 mA cm−2 for HER and OER, respectively, outperforming most of non‐noble bifunctional electrocatalysts reported hitherto. Particularly, this hybrid catalyst also displays an excellent overall water splitting activity, requiring low voltages of 1.561 and 1.663 V to attain 100 and 500 mA cm−2 with excellent durability in 1 m KOH, respectively. Most importantly, the catalyst is stable for >120 h, even when the current density is 500 mA cm−2, which is prominently superior to IrO2(+)//Pt(−) coupled noble electrodes, and is among the very best bifunctional catalysts reported thus far. Detailed theoretical calculations reveal that the interfacial interaction between Fe2P and Co2N can further improve the H* binding energy at the iron sites.
语种:
英文
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The electronic properties and application of sawtoothlike C3N nanoribbon
作者:
Liu, Zhongyu;Zheng, Yuqi;Zhang, Meng;Cao, Liemao;Zhou, Guanghui
期刊:
Chemical Physics Letters ,2023年825:140598 ISSN:0009-2614
通讯作者:
Cao, LM
作者机构:
[Cao, Liemao; Liu, Zhongyu; Zheng, Yuqi; Cao, LM; Zhang, Meng] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Zhou, Guanghui] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;[Zhou, Guanghui] Shaoyang Univ, Coll Sci, Dept Phys, Shaoyang 422001, Peoples R China.
通讯机构:
[Cao, LM ] H;Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
关键词:
DFT;Electronic properties;Nanoribbon
摘要:
The two-dimensional material C3N is expected to be an ideal material for the next generation of high-strength electronic devices based on its excellent properties. Here we systemically study the electronic properties for the sawtoothlike C3N nanoribbons by using the first principles calculations. We find that the fully polarized system occurs for specific windows of energies in the pristine nanoribbons. Passivation of the nanoribbons edges with hydrogen atoms can enhance the stability of the nanoribbon and change its electronic properties. The passivated Tree-saw C3N nanoribbons transforms into a direct band gap semiconductor. While the passivated Christmas tree C3N nanoribbons exhibit semiconducting or metallic properties depending on the edge. Finally, we propose a molecular junction based on the zigzag graphene nanoribbons electrode. The computational results imply that the device can be used as a rectifier or a spin valve. These results are helpful expand the application of C3N in nanoelectronic devices. © 2023 Elsevier B.V.
语种:
英文
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An efficient differential analysis method based on deep learning
作者:
Huang, Ying;Li, Lang;Guo, Ying;Ou, Yu;Huang, Xiantong
期刊:
Computer Networks ,2023年224:109622 ISSN:1389-1286
通讯作者:
Li, Lang(lilang@hynu.edu.cn)
作者机构:
[Li, Lang] Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.
通讯机构:
[Li, L.] C;College of Computer Science and Technology, Hengyang Normal University, China
关键词:
Deep learning;Differential analysis;MLP;ResNet
摘要:
Differential analysis is a vital tool for evaluating the security of cryptography algorithms. There has been a growing interest in the differential distinguisher based on deep learning. Various neural network models have been created to increase the accuracy of distinguishing between ciphertext and random sequences. However, few studies have focused on differential analysis at the design stage of cryptographic algorithms. This paper presents an appropriate model for differential analysis of block ciphers. The model is similar to multilayer perceptron (MLP) models in simplicity and clarity. It also introduces a shortcut connection that enables one to learn more information about the differential analysis dataset. The model is used to predict the minimum number of active S-boxes (AS), linking differential analysis results to algorithm features. This model and two classical neural network models are compared under fair experimental conditions. The findings indicate that our model predicts the AS values with an accuracy of 97%. It can effectively predict the results of differential analysis. In addition, the differential analysis dataset is constructed for SPN structure cryptographic algorithms. It can be used for further differential analysis studies based on deep learning. © 2023 Elsevier B.V.
语种:
英文
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Understanding the influence of bending on OER activity in metal phthalocyanines: A first-principles study
作者:
Zhou, Zhong-Peng;Hao, Ning-Jing;Zhang, Qian-Kui;Deng, Xiao-Hui;Zhang, Hui;...
期刊:
Applied Surface Science ,2023年618:156582 ISSN:0169-4332
通讯作者:
Tang, Zhen-Kun(zktang@hynu.edu.cn)
作者机构:
[Zhou, Zhong-Peng; Deng, Xiao-Hui; Zhang, Qian-Kui; Tang, Zhen-Kun] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Zhou, Zhong-Peng; Tong, Chuan-Jia; Hao, Ning-Jing] Cent South Univ, Sch Phys & Elect, Hunan Key Lab Nanophoton & Devices, Hunan Key Lab Super Microstructure & Ultrafast Pro, Changsha 410083, Peoples R China.;[Zhang, Hui] Shenyang Univ, Normal Sch, Shenyang 110044, Peoples R China.
通讯机构:
[Tang, Z.-K.] C;College of Physics and Electronics Engineering, China
关键词:
Electronic structure;First-principles study;Metal phthalocyanines;OER overpotential;Single-walled carbon nanotubes
摘要:
Carbon-supported nonprecious metals catalysts have been extensively studied and proved effective in electrocatalytic reactions in recent years. In this paper, we systematically investigate the microstructure and electronic properties of metal phthalocyanines (MPc, M = Fe, Co, Ni) supported on single-walled carbon nanotubes (SWCNTs) based on density functional theory (DFT) simulations. The effects of three SWCNTs substrates with different diameters on the catalytic activity are also explored. The results demonstrate that SWCNTs substrate can cause the bending of MPc and the increase of the diameter of the SWCNTs strengthens the adsorption to MPc molecules, which enlarges the N-Metal-N (N-M−N) angles (angels for diagonally opposite nitrogen atoms of metal-N4 coordination sphere) of the MPc structure. Furthermore, the enlargement of the N-M−N angles of MPc can decrease the overpotential of the oxygen evolution reaction (OER), indicating improved catalytic activity. The introduction of SWCNTs substrate improves the conductivity of MPc molecules, and changes the N-M−N angles of MPc, which in turn optimizes the bonding strength between MPc and oxygen-containing intermediates and improves the catalytic activity. Such findings are expected to be employed in more planar molecular complexes catalyzed reactions. © 2023 Elsevier B.V.
语种:
英文
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Non-Markovianity of an atom in a semi-infinite rectangular waveguide
作者:
Zeng, Jing;Song, Yaju;Lu, Jing;Zhou, Lan
期刊:
中国物理B ,2023年32(3):128-136 ISSN:1674-1056
作者机构:
[Zeng, Jing; Lu, Jing; Zhou, Lan] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contro, Innovat Ctr Quantum Effects & Applicat, Dept Phys & Synerget,Key Lab Matter Microstruct &, Changsha 410081, Peoples R China.;[Song, Yaju] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
关键词:
open system;non-Markovianity;waveguide QED;quantum information
摘要:
We investigate the non-Markovianity (NM) of a waveguide QED with a two-level atom as the system and a semi-infinite rectangular waveguide as the environment, where the transverse magnetic (TM$_{mn}$) modes define the quantum channels of guided photons. The perfect mirror imposed by the finite end exerts a retarded feedback mechanism to allow for information backflow, which leads to NM dynamics. For the energy separation of the atom far away from the cutoff frequencies of transverse modes, the delay differential equations are obtained with single-excitation initial in the atom. Our attention is focused on the effects of multiple quantum channels involved in guiding photons on the degree of non-Markovian behavior. An asymptotic value of the non-Markovianity $\mathcal{N}_{1}$ can be found as the atom-mirror distance is large enough, however, the asymptotic value of $\mathcal{N}_{2}$ of the atom interacting with the effective double-modes is lower than that of the atom interacting with the effective single-mode. We also show that $\mathcal{N}_{1}$ is a constant, and the analytical expression for $\mathcal{N}_{2}$ is related to the parameters associated with the modes, which is related to the interference of the two modes.
语种:
英文
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DBST: a lightweight block cipher based on dynamic S-box
作者:
Yan, Liuyan;Li, Lang;Guo, Ying
期刊:
计算机科学前沿(英文) ,2023年17(3):177-185 ISSN:2095-2228
通讯作者:
Li, Lang(lilang911@126.com)
作者机构:
[Guo, Ying; Li, Lang; Yan, Liuyan] Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.;[Guo, Ying; Li, Lang; Yan, Liuyan] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.
通讯机构:
[Lang Li] C;College of Computer Science and Technology, Hengyang Normal University, Hengyang, China<&wdkj&>Hunan Provincial Key Laboratory of Intelligent Information Processing and Application, Hengyang Normal University, Hengyang, China
关键词:
internet of things;5G;dynamic S-box;bit-slice technology;lightweight block cipher
摘要:
IoT devices have been widely used with the advent of 5G. These devices contain a large amount of private data during transmission. It is primely important for ensuring their security. Therefore, we proposed a lightweight block cipher based on dynamic S-box named DBST. It is introduced for devices with limited hardware resources and high throughput requirements. DBST is a 128-bit block cipher supporting 64-bit key, which is based on a new generalized Feistel variant structure. It retains the consistency and significantly boosts the diffusion of the traditional Feistel structure. The SubColumns of round function is implemented by combining bit-slice technology with subkeys. The S-box is dynamically associated with the key. It has been demonstrated that DBST has a good avalanche effect, low hardware area, and high throughput. Our S-box has been proven to have fewer differential features than RECTANGLE S-box. The security analysis of DBST reveals that it can against impossible differential attack, differential attack, linear attack, and other types of attacks. © 2023, Higher Education Press.
语种:
英文
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Three-in-one organic-inorganic heterostructures: From scalable ball-milling synthesis to freestanding cathodes with high areal capacity for aqueous zinc-ion batteries
作者:
Yang, Hengyu;Wang, Yuan;Wang, Panpan;Liu, Xiong;Liang, Yongle;...
期刊:
Chemical Engineering Journal ,2023年457:141140 ISSN:1385-8947
通讯作者:
Yang, Liwen(ylwxtu@xtu.edu.cn)
作者机构:
[Wang, Panpan; Liang, Yongle; Liu, Xiong; Ni, Wentao; Wang, Yuan; Yang, Liwen; Yang, Hengyu] Xiangtan Univ, Sch Phys & Optoelect, Xiangtan 411105, Hunan, Peoples R China.;[Xu, Guobao] Xiangtan Univ, Sch Mat Sci & Engn, Xiangtan 411105, Hunan, Peoples R China.;[Wei, Xiaolin] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
通讯机构:
[Yang, L.] S;School of Physics and Optoelectronics, China
关键词:
Aqueous zinc-ion batteries;Freestanding cathode;Heterostructures;High areal-capacity;Vanadium-based oxides
摘要:
Aqueous Zn-ion batteries (AZIBs) have great potential in large-scale energy storage, however, developing suitable cathodes with high energy/power densities remains highly challenging. Herein, a unique organic-inorganic heterostructures (denoted as Ov-PVO/G) of poly(3,4-ethylenedioxythiophene) intercalated V2O5 nanocrystals anchored on few-layer graphene by a simple and scalable ball-milling approach are demonstrated for high areal-capacity AZIBs cathodes, in which, adjusted interlayer spacing, abundant oxygen vacancies and robust heterointerfaces can be simultaneously constructed. Moreover, the feature of being well dispersed in different polar solvents (H2O, NMP, etc.) enable facile incorporation of the Ov-PVO/G heterostructures into conductive networks of single-walled carbon nanotubes to fabricate freestanding composite cathodes. Electrochemical measurement and first-principles calculations indicate that such “Three-in-One” heterostructure can significantly enhance Zn2+ adsorption/desorption, electrical conductivity and charge transfer due to strong synergy, thereby exhibiting high-capacity and accelerated reaction kinetics during cycling. Specifically, at a practical mass loading of 12.0 mg/cm2, the freestanding Ov-PVO/G cathodes show a high areal-capacity of 6.1 mAh/cm2 at 2.4 mA/cm2 and works stable with an area-capacity of 1.63 mAh/cm2 at 120 mA/cm2 after 500 cycles. More importantly, flexible soft-packaged AZIBs based on 3×3 cm2 high mass-loading Ov-PVO/G cathodes deliver record-high and stable electric energy beyond 21.5 mAh at different bending states. This work paves a more promising way to practical application of high-performance AZIBs. © 2022 Elsevier B.V.
语种:
英文
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Pd doping Au(111) surfaces enhancing formaldehyde adsorption: A first-principle study
作者:
Wu, Guang;Xu, Wang-Ping;Zuo, Hua-Mei;Wei, Xiao-Lin;Cao, Jue-Xian
期刊:
计算材料学(英文) ,2023年216:111885 ISSN:2057-3960
通讯作者:
Wei, Xiao-Lin(xlw@xtu.edu.cn)
作者机构:
[Xu, Wang-Ping; Wei, Xiao-Lin; Cao, Jue-Xian; Wu, Guang; Zuo, Hua-Mei] Xiangtan Univ, Dept Phys, Xiangtan 411105, Peoples R China.;[Wei, Xiao-Lin] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.;[Xu, Wang-Ping; Wei, Xiao-Lin; Cao, Jue-Xian; Wu, Guang; Zuo, Hua-Mei] Xiangtan Univ, Hunan Inst Adv Sensing & Informat Technol, Xiangtan 411105, Peoples R China.
通讯机构:
[Wei, X.-L.] D;Department of Physics & Hunan Institute of Advanced Sensing and Information Technology, China
关键词:
First-principles;Gas sensor;HCHO adsorption;Sensitive materials
摘要:
Toxic gas detection is essential and valuable in pollution monitoring. We used first-principles computations to investigate the adsorption behavior and interaction mechanism of formaldehyde (HCHO) molecules on the Pd/Au(1 1 1) surface. The results reveal that HCHO is physisorbed on the Au(1 1 1) surface and chemisorbed on the Pd(1 1 1) surface. Furthermore, Pd atoms doped on the Au(1 1 1) surface can significantly increase the adsorption energies and charge transfers of the HCHO molecule, implying that the Pd metal can function as an excellent sensitive material for HCHO response. Additionally, the interaction mechanism between the HCHO molecule and the Pd atoms demonstrated that the two must meet the rules of energy-level matching and orbital wave function maximum overlap perfectly. Our research could pave the way for developing high-performance gas sensors by exploring gas-sensitive materials. © 2022 Elsevier B.V.
语种:
英文
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A dynamic multi-objective particle swarm optimization algorithm based on adversarial decomposition and neighborhood evolution
作者:
Zheng, Jinhua;Zhang, Zeyu;Zou, Juan;Yang, Shengxiang;Ou, Junwei;...
期刊:
Swarm and Evolutionary Computation ,2022年69:100987 ISSN:2210-6502
通讯作者:
Zhang, ZY
作者机构:
[Zheng, Jinhua; Hu, Yaru; Ou, Junwei; Zhang, Zeyu; Zou, Juan] Xiangtan Univ, Key Lab Intelligent Comp & Informat Proc, Minist Educ, Xiangtan 411105, Hunan, Peoples R China.;[Zheng, Jinhua] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;[Yang, Shengxiang] De Montfort Univ, Sch Comp Sci & Informat, Leicester LE1 9BH, Leics, England.
通讯机构:
[Zhang, ZY ] X;Xiangtan Univ, Key Lab Intelligent Comp & Informat Proc, Minist Educ, Xiangtan 411105, Hunan, Peoples R China.
关键词:
Dynamic multi-objective optimization;Particle swarm optimization;Adversarial decomposition
摘要:
Many multi-objective optimization problems in the real world are dynamic, with objectives that conflict and change over time. These problems put higher demands on the algorithm's convergence performance and the ability to respond to environmental changes. Confronting these two points, this paper proposes a dynamic multi-objective particle swarm optimization algorithm based on adversarial decomposition and neighborhood evolution (ADNEPSO). To overcome the instability of the traditional decomposition method for the changing Pareto optimal front (POF) shape, the proposed algorithm utilizes the complementary characteristics in the search area of the adversarial vector, and the two populations are alternately updated and co-evolved by adversarial search directions. Additionally, a novel particle update strategy is proposed to select promising neighborhood information to guide evolution and enhance diversity. To improve the ability to cope with environmental changes, an effective dynamic response mechanism is proposed, including three parts: archive set prediction, exploration of global optimal information, and retention of excellent particles to accelerate convergence to the Pareto optimal set (POS) in the new environment. The proposed algorithm is tested on a series of benchmark problems and compared to several state-of-the-art algorithms. The results show that ADNEPSO performed excellently in both convergence and diversity, and is highly competitive in dealing with dynamic problems. © 2021 Elsevier B.V.
语种:
英文
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SCENERY: a lightweight block cipher based on Feistel structure
作者:
Feng, Jingya;Li, Lang*
期刊:
计算机科学前沿(英文) ,2022年16(3):1-10 ISSN:2095-2228
通讯作者:
Li, Lang
作者机构:
[Li, Lang; Feng, Jingya] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;[Li, Lang; Feng, Jingya] Hunan Normal Univ, Coll Informat Sci & Engn, Changsha 410081, Peoples R China.;[Li, Lang] Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.
通讯机构:
[Li, Lang] H;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;Hunan Normal Univ, Coll Informat Sci & Engn, Changsha 410081, Peoples R China.;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.
关键词:
lightweight block cipher;feistel structure;cryptanalysis;internet of things
摘要:
In this paper, we propose a new lightweight block cipher called SCENERY. The main purpose of SCENERY design applies to hardware and software platforms. SCENERY is a 64-bit block cipher supporting 80-bit keys, and its data processing consists of 28 rounds. The round function of SCENERY consists of 8 4 × 4 S-boxes in parallel and a 32 × 32 binary matrix, and we can implement SCENERY with some basic logic instructions. The hardware implementation of SCENERY only requires 1438 GE based on 0.18 um CMOS technology, and the software implementation of encrypting or decrypting a block takes approximately 1516 clock cycles on 8-bit microcontrollers and 364 clock cycles on 64-bit processors. Compared with other encryption algorithms, the performance of SCENERY is well balanced for both hardware and software. By the security analyses, SCENERY can achieve enough security margin against known attacks, such as differential cryptanalysis, linear cryptanalysis, impossible differential cryptanalysis and related-key attacks. © 2022, Higher Education Press.
语种:
英文
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Strong bulk-surface interaction dominated in-plane anisotropy of electronic structure in GaTe
作者:
Lai, Kang;Ju, Sailong;Zhu, Hongen;Wang, Hanwen;Wu, Hongjian;...
期刊:
Communications Physics ,2022年5(1) ISSN:2399-3650
通讯作者:
Dai, Jiayu(jydai@nudt.edu.cn);Han, Zheng(vitto.han@gmail.com);Zhu, Mengjian(zhumengjian11@nudt.edu.cn)
作者机构:
[Ju, Sailong; Dai, Jiayu; Zhang, Enrui; Wu, Hongjian; Lai, Kang; Yang, Ming] Natl Univ Def Technol, Dept Phys, Changsha 410073, Peoples R China.;[Zhu, Hongen; Cui, Shengtao] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China.;[Wang, Hanwen] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.;[Yang, Bingjie; Li, Fangsen] Univ Sci & Technol China, Sch Nanotech & Nanobion, Hefei 230026, Peoples R China.;[Deng, Xiaohui] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
通讯机构:
[Han, Zheng] S;[Zhu, Mengjian] C;[Dai, Jiayu] D;Department of Physics, National University of Defense Technology, Changsha, China<&wdkj&>State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, China<&wdkj&>Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, China<&wdkj&>College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
摘要:
Recently, intriguing physical properties have been unraveled in anisotropic layered semiconductors, in which the in-plane electronic band structure anisotropy often originates from the low crystallographic symmetry and thus a thickness-independent character emerges. Here, we apply high-resolution angle-resolved photoemission spectroscopy to directly image the in-plane anisotropic energy bands in monoclinic gallium telluride (GaTe). Our first-principles calculations reveal the in-plane anisotropic energy band structure of GaTe measured experimentally is dominated by a strong bulk-surface interaction rather than geometric factors, surface effect and quantum confinement effect. Furthermore, accompanied by the thickness of GaTe increasing from mono- to few-layers, the strong interlayer coupling of GaTe induces direct-indirect-direct band gap transition and the in-plane anisotropy of hole effective mass is reversed. Our results shed light on the physical origins of in-plane anisotropy of electronic structure in GaTe, providing guidance to further improving the performance of electronic and optoelectronic devices based on the layered anisotropic semiconductors. © 2022, The Author(s).
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Tunable early CU size decision for depth map intra coding in 3D-HEVC using unsupervised learning
作者:
Li, Yue;Yang, Gaobo;Qu, Aiping;Zhu, Yapei
期刊:
Digital Signal Processing ,2022年123:103448 ISSN:1051-2004
通讯作者:
Yang, GB
作者机构:
[Qu, Aiping; Li, Yue] Univ South China, Comp Sch, Hengyang 421001, Peoples R China.;[Yang, Gaobo; Yang, GB] Hunan Univ, Sch Informat Sci & Engn, Changsha 410082, Peoples R China.;[Zhu, Yapei] Hengyang Normal Univ, Fac Phys & Elect Informat Sci, Hengyang 421002, Peoples R China.
通讯机构:
[Yang, GB ] H;Hunan Univ, Sch Informat Sci & Engn, Changsha 410082, Peoples R China.
关键词:
3D-HEVC;Unsupervised learning;Depth map;CU size decision;RD cost
摘要:
To further improve coding gain for depth map in 3D extension of High Efficiency Video Coding (3D-HEVC), many new coding techniques are introduced, which drastically increase the coding complexity. In this work, an early intra coding unit (CU) size decision scheme is proposed for 3D-HEVC intra depth map coding based on unsupervised learning approach. First, we treat the early CU size decision as a clustering problem. Then, three clustering models are developed for those CUs with the sizes of 64×64, 32×32 and 16×16 to early determine whether they be further split or not. Among them, the center of the clustering model is obtained by using intra learning method. Finally, in order to meet the user's specific application preference, the similarity distance is introduced into the early CU size decision. By adjusting the similarity distance, a tunable early CU size decision is achieved to obtain different levels of coding complexity reduction. Experimental results show that the proposed scheme achieves encoding time reduction ranging from 54.0% to 68.4% on average for depth map intra coding, while the Bjontegaard delta bit rate (BDBR) of synthesized views only increased by 0.01% to 0.73%, it outperforms the state-of-the-art works in term of coding complexity reduction and BDBR increase. © 2022 Elsevier Inc.
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英文
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Side-channel analysis attacks based on deep learning network
作者:
Ou, Yu;Li, Lang
期刊:
计算机科学前沿(英文) ,2022年16(2):1-11 ISSN:2095-2228
通讯作者:
Li, L
作者机构:
[Ou, Yu; Li, Lang] Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;[Ou, Yu; Li, Lang] Hunan Normal Univ, Coll Informat Sci & Engn, Changsha 410081, Peoples R China.;[Li, Lang] Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.
通讯机构:
[Li, L ] H;Hengyang Normal Univ, Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang 421002, Peoples R China.;Hunan Normal Univ, Coll Informat Sci & Engn, Changsha 410081, Peoples R China.;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang 421002, Peoples R China.
关键词:
side-channel analysis;template attack;machine learning;deep learning
摘要:
There has been a growing interest in the side-channel analysis (SCA) field based on deep learning (DL) technology. Various DL network or model has been developed to improve the efficiency of SCA. However, few studies have investigated the impact of the different models on attack results and the exact relationship between power consumption traces and intermediate values. Based on the convolutional neural network and the autoencoder, this paper proposes a Template Analysis Pre-trained DL Classification model named TAPDC which contains three sub-networks. The TAPDC model detects the periodicity of power trace, relating power to the intermediate values and mining the deeper features by the multi-layer convolutional net. We implement the TAPDC model and compare it with two classical models in a fair experiment. The evaluative results show that the TAPDC model with autoencoder and deep convolution feature extraction structure in SCA can more effectively extract information from power consumption trace. Also, Using the classifier layer, this model links power information to the probability of intermediate value. It completes the conversion from power trace to intermediate values and greatly improves the efficiency of the power attack. © 2022, Higher Education Press.
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英文
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An online gradient-based parameter identification algorithm for the neuro-fuzzy systems
作者:
Li, Long* ;Long, Zuqiang;Ying, Hao;Qiao, Zhijun
期刊:
Fuzzy Sets and Systems ,2022年426:27-45 ISSN:0165-0114
通讯作者:
Li, Long
作者机构:
[Li, Long] Hengyang Normal Univ, Coll Math & Stat, Hengyang, Hunan, Peoples R China.;[Long, Zuqiang] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang, Hunan, Peoples R China.;[Ying, Hao] Wayne State Univ, Dept Elect & Comp Engn, Detroit, MI 48202 USA.;[Qiao, Zhijun] Univ Texas Rio Grande Valley, Dept Math, Edinburg, TX 78539 USA.
通讯机构:
[Li, Long] H;Hengyang Normal Univ, Coll Math & Stat, Hengyang, Hunan, Peoples R China.
关键词:
Mamdani fuzzy model;Neuro-fuzzy systems;Online gradient learning algorithm;Adaptive learning rate;Convergence
摘要:
Online gradient descent method has been widely applied for parameter learning in neuro-fuzzy systems. The success of the application relies on the convergence of the learning procedure. However, there barely have been convergence analyses on the online learning procedure for neuro-fuzzy systems. In this paper, an online gradient learning algorithm with adaptive learning rate is proposed to identify the parameters of the neuro-fuzzy systems representing the Mamdani fuzzy model with Gaussian fuzzy sets. We take the reciprocals of the variances of the Gaussian membership functions, rather than the variances themselves, as independent variables when computing the gradient with respect to the variance parameters. Subsequently, oscillation of the gradient value in the learning process can be avoided. Furthermore, some convergence results for this online learning scheme are studied. Finally, three numerical examples are provided to illustrate the performance of the proposed algorithm. © 2020 Elsevier B.V.
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英文
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Photovoltaic-Driven Flexible Single-Walled Carbon Nanotubes for Self-Powered and Polarization-Sensitive Infrared Photodetection
作者:
Duan, Tingting;Xie, Yiqun;Xu, Wangping;Wei, Xiaolin;Cao, Juexian
期刊:
ACS Applied Electronic Materials ,2022年4(11):5602-5607 ISSN:2637-6113
通讯作者:
Xu, Wangping(xuwp@xtu.edu);Cao, Juexian(jxcao@xtu.edu.cn)
作者机构:
[Cao, Juexian; Duan, Tingting; Xu, Wangping; Wei, Xiaolin] Xiangtan Univ, Dept Phys, Xiangtan 411105, Peoples R China.;[Cao, Juexian; Duan, Tingting; Xu, Wangping; Wei, Xiaolin] Xiangtan Univ, Hunan Inst Adv Sensing & Informat Technol, Xiangtan 411105, Peoples R China.;[Xie, Yiqun] Shanghai Normal Univ, Dept Phys, Shanghai 200232, Peoples R China.;[Wei, Xiaolin] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
通讯机构:
[Xu, W.; Cao, J.] D;Department of Physics, China
关键词:
single-walled carbon nanotube;photocurrent;infrared detection;polarization sensitivity;bending angle
摘要:
Infrared detection devices with self-powered and high polarization sensitivity are motivated by not only the interest in basic science but also the practical applications. Here, we have systematically studied the photoelectronic properties of a chiral (7, 0) single-walled carbon nanotube (SWCNT) with the bending angle θ ranging from 0° to 45° by first-principles. Our results indicate that bending stress can break the spatial inversion symmetry of the SWCNT, which will result in a photocurrent under polarized light. And the maximal photocurrent is demonstrated corresponding to a 25° bending angle in the (7, 0) SWCNT. Moreover, the fascinating extinction ratio is up to 177 of the bent SWCNT, which may have a good application for high polarization sensitivity infrared detection devices. In addition, the photocurrent and polarization sensitivity mainly depend on the bending angles of the SWCNT, which barely changed accompanied by shifting of the illumination sites. Our study provides a feasible way to realize self-powered and high polarization-sensitive infrared detection devices in SWCNTs. © 2022 American Chemical Society. All rights reserved.
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英文
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Controllable Dispersive Wave Radiation from Pearcey Gaussian Pulses
作者:
Zhang, Xiang;Li, Haozhe;Wang, Zhiteng;Chen, Changshui;Zhang, Lifu
期刊:
Annalen der Physik ,2022年534(5):2100479- ISSN:0003-3804
通讯作者:
Chen, CS;Zhang, LF
作者机构:
[Chen, Changshui; Zhang, Xiang] South China Normal Univ, Guangdong Prov Key Lab Nanophoton Funct Mat & Dev, Sch Informat Optoelect Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China.;[Chen, Changshui; Zhang, Xiang] South China Normal Univ, Guangzhou Key Lab Special Fiber Photon Devices, Sch Informat Optoelect Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China.;[Li, Haozhe; Zhang, Lifu; Zhang, Xiang] Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Inst Microscale Optoelect, Shenzhen 518060, Peoples R China.;[Wang, Zhiteng] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China.
通讯机构:
[Chen, CS ; Zhang, LF ] S;South China Normal Univ, Guangdong Prov Key Lab Nanophoton Funct Mat & Dev, Sch Informat Optoelect Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China.;South China Normal Univ, Guangzhou Key Lab Special Fiber Photon Devices, Sch Informat Optoelect Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China.;Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Inst Microscale Optoelect, Shenzhen 518060, Peoples R China.
关键词:
nonlinear optics;dispersive waves;Pearcey Gaussian pulses;pulse propagation
摘要:
The process of dispersive waves (DWs) emitted from unique Pearcey Gaussian (PG) pulses with both temporal and spectral asymmetric shapes in the anomalous dispersion region of optical fiber is investigated. In contrast to symmetric pulses such as fundamental soliton (Sech) or Gaussian, the radiation amplitude and energy conversion efficiency of DWs are significantly improved by adjusting the asymmetry of the spectral distribution and the temporal oscillation structure of PG pulses. It is shown that, for the case of PG pulses, the minimum value of third-order dispersion parameter required for the emergence of DWs emission is nearly reduced 50% compared with the case of symmetric pulses. It is also shown that the radiation frequency of DWs emitted from PG pulses can be predicted by a modified phase matching condition. The theoretical predictions are in good agreement with the numerical simulations. The impact of Raman scattering effects on the DWs emission is also disclosed. The results of this study clearly reveal the impact of the inherent behaviors of PG pulses on the DWs emission, which should be relevant for applications requiring broadband light sources based on the mechanism of DWs emission. © 2022 Wiley-VCH GmbH.
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英文
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The unique photoelectronic properties of the two-dimensional Janus MoSSe/WSSe superlattice: a first-principles study
作者:
Zhang, Huanhuan;Deng, Dawei;Zou, Dai-Feng;Li, Xi-Bo;Tang, Zhen-Kun;...
期刊:
Dalton Transactions ,2022年51(42):16102-16110 ISSN:1477-9226
通讯作者:
Ge, Qing-Xia(1081003@hnust.edu.cn);Yin, Wen-Jin(ywj@hnust.edu.cn)
作者机构:
[Yin, Wen-Jin; Deng, Dawei; Zou, Dai-Feng; Ge, Qing-Xia; Zhang, Huanhuan] Hunan Univ Sci & Technol, Sch Phys & Elect Sci, Xiangtan 411201, Peoples R China.;[Yin, Wen-Jin; Zhang, Huanhuan] Hunan Univ Sci & Technol, Key Lab Intelligent Sensors & Adv Sensing Mat Hun, Xiangtan 411201, Peoples R China.;[Li, Xi-Bo] Jinan Univ, Dept Phys, Guangzhou 510632, Peoples R China.;[Tang, Zhen-Kun] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China.;[Wei, Xiao-Lin] Xiangtan Univ, Dept Phys, Xiangtan 411105, Hunan, Peoples R China.
通讯机构:
[Qing-Xia Ge; Wen-Jin Yin] S;School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, China<&wdkj&>School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, China<&wdkj&>Key Laboratory of Intelligent Sensors and Advanced Sensing Materials of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, China
摘要:
Designing photocatalysts with suitable band alignment and considerable carrier mobility is extremely important. Here, by means of first-principles calculation, we systematically investigated the structural, photoelectronic, and carrier mobility behavior of the two-dimensional Janus MoSSe/WSSe superlattice. The results show that both armchair-type (AN-SL) and zigzag-type (ZN-SL) superlattices are relatively stable with negative Ef values in the range of −2.35 to −1.16 eV. Band gap and band edge position calculations demonstrate that these superlattices are completely suitable for water splitting by visible light. Particularly, the interface contact of the superlattice can be spontaneously changed from type-I to type-II when N > 4, facilitating separation of photogenerated carriers. Furthermore, the hole carrier mobility (μh) in AN-SL can be effectively regulated from 1200 to 2200 cm2 V−1 s−1, much larger than that of the isolated components. Interestingly, the disparity of hole/electron carrier mobility is remarkably large with an approximately 20-fold difference, showing the potential in prohibiting the recombination of photogenerated carriers. This unique behavior is further illustrated by the relaxation times of carriers, where the lifetime of hole carriers is about 7 times larger than that of electron carriers. These findings suggest that forming a Janus superlattice is a promising approach for regulating the photoelectronic properties of semiconductors, providing a promising way to design high efficiency photocatalysts.
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英文
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A perspective on optimizing photoelectric conversion process in 2D transition-metal dichalcogenides and related heterostructures
作者:
Dong, Jiansheng;Zhao, Yipeng;Ouyang, Gang;Yang, Guowei
期刊:
Applied Physics Letters ,2022年120(8):080501 ISSN:0003-6951
通讯作者:
Ouyang, Gang(gangouy@hunnu.edu.cn);Yang, Guowei(stsygw@mail.sysu.edu.cn)
作者机构:
[Dong, Jiansheng; Ouyang, Gang] Hunan Normal Univ, Sch Phys & Elect, Key Lab Low Dimens Quantum Struct & Quantum Contro, Key Lab Matter Microstruct & Funct Hunan Prov,Mini, Changsha 410081, Peoples R China.;[Zhao, Yipeng] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China.;[Yang, Guowei] Sun Yat Sen Zhongshan Univ, Sch Mat Sci & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China.
通讯机构:
[Ouyang, G.] K;[Yang, G.] S;Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control, Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, School of Physics and Electronics, Hunan Normal University, Changsha, China
摘要:
As a type of layered two-dimensional (2D) structure, transition-metal dichalcogenides (TMDs) and related heterostructures have recently received much attention in applications such as electronics, optoelectronics, and energy conversion/storage. The changes in the atomic bond nature in 2D TMDs, including bond length, bond angle, and bond energy, are the key factors affecting the performance of these systems. Some modulations, such as strain engineering and geometry effect, provide effective methods to enhance the related performance of devices constructed by 2D TMDs by a change in the bond nature. In this Perspective, we review our recent works done on photoelectric conversion properties of 2D TMDs and related heterostructures under various conditions, analyze the underlying mechanism of different modulation modes, and then identify the key factors determining optimal optoelectronic properties at the atomic level. © 2022 Author(s).
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