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用于神经形态学计算的低能耗、高稳定性2D-3D钙钛矿忆阻器

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Science China Materials 2023年第5期66卷 2013-2022页

作者：孙凯旋王庆瑞周龙王静娟常晶晶郭瑞 beng kang tay 闫小兵 Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province College of Electron and Information EngineeringHebei UniversityBaoding 071002China State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’an 710071China Centre for Micro-and Nano-Electronics(CMNE) School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore UMI 3288 CINTRA(CNRS-NTU-THALES Research Alliances) Nanyang Technological UniversitySingapore 637553Singapore

近年来,有机-无机卤化物钙钛矿在忆阻器和人工突触器件等电子器件中的应用取得了快速进展.由于其离子迁移特性和制造上的优势,有机-无机卤化物钙钛矿有望成为下一代计算设备的候选材料.本文采用ITO/FA_(1-y)MA_(y)PbI_(3-x)Cl_(x)/(PEA)... 详细信息

近年来,有机-无机卤化物钙钛矿在忆阻器和人工突触器件等电子器件中的应用取得了快速进展.由于其离子迁移特性和制造上的优势,有机-无机卤化物钙钛矿有望成为下一代计算设备的候选材料.本文采用ITO/FA_(1-y)MA_(y)PbI_(3-x)Cl_(x)/(PEA)_(2)PbI_(4)/Au的叠层结构,研究了2D-3D有机-无机杂化钙钛矿忆阻器.结果表明,这种新型忆阻器具有新颖的电阻开关特性,如扫描速率相关的电流开关特性、良好的电流-电压曲线重复性和超低能耗.利用p-i-n结模型证实了缺陷调制电子隧穿机制,并证明了忆阻器件的电导状态由电极侧附近钙钛矿薄膜中的缺陷浓度决定.除了良好的忆阻特性外,这种2D-3D钙钛矿型忆阻器还可以很好地用作人工突触,其内部缺陷运动可以真实地模拟生物突触中Ca^(2+)的流入和挤出.此外,由于有机-无机卤化物钙钛矿中的可切换p-i-n结构,这种基于钙钛矿的人工突触具有超低功耗.我们的发现展示了2D-3D钙钛矿忆阻器在未来神经形态计算系统中的巨大应用潜力.

关键词： perovskite ion migration memristor low energy consumption neuromorphic computing

Valley polarization in stacked MoS2 induced by circularly polarized light

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Nano Research 2017年第5期10卷 1618-1626页

作者： Juan Xia Xingli Wang beng kang tay Shoushun Chen Zheng Liu Jiaxu Yan Zexiang Shen Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore CINTRA CNRS/NTU/-I-HALES UM13288 Research Techno Plaza Singapore 637553 Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore Center for Programmable Materials School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Institute of Advanced Materials (IAM) Jiangsu National Synergistic Innovation Can tar for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China Centre for Disruptive Photonic Technologies Nanyong Technological University Singapore 63737L Singapore

Manipulation of valley pseudospins is crucial for future valleytronics. lhe emerging transition metal dichalcogenides （TMDs） provide new possibilities for exploring the interplay among the quantum degrees of freedom, including real spin, valley pseudospin, and layer pseudospin. For example, spin-valley coupling results in valley-dependent circular dichroism in which electrons with particular spin （up or down） can be selectively excited by chiral optical pumping in monolayer TMDs, whereas in few-layer TMDs, the interlayer hopping further affects the spin-valley coupling. In addition to valley and layer pseudospins, here we propose a new degree of freedom--stacking pseudospin--and demonstrate new phenomena correlated to this new stacking freedom that otherwise require the application of external electrical or magnetic field. We investigated all possible stacking configurations of chemical-vapor-deposition-grown trilayer MoS2 （AAA, ABB, AAB, ABA, and 3R）. Although the AAA, ABA, 3R stackings possess a sole peak with lower degree of valley polarization than that in monolayer samples, the AAB （ABB） stackings exhibit two distinct peaks, one similar to that observed in monolayer MoS2 and findings provide a more future valleytronics. an additional unpolarized complete understanding of peak at lower energy. Our valley quantum control for

关键词： circularly polarizedphotoluminescence,first-principlescalculations,molybdenum disulfide,ultra-low-frequency Raman spectroscopy valley polarization

Nonlinear Absorption and Low-threshold Two-photon Pumped Amplified Stimulated Emission from FAPbBr_(3) Nanocrystals

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发光学报 2024年第8期45卷 1281-1291页

作者： WANG Yajuan tay Yong kang Eugene WANG Fang YU Sheng SUM Tze Chien LIU Wei School of Materials and Chemical Engineering Ningbo University of TechnologyNingbo 315211China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityHangzhou 311300China

Formamidinium lead bromide(FAPbBr_(3))nanocrystals(NCs)have been considered to be a good optoelectronic material due to their pure green emission,excellent stability and superior carrier transport ***,two-photon pumped amplified spontaneous emission(ASE)and the corresponding nonlinear optical properties of FAPbBr_(3) NCs are scarcely ***,we synthesized colloidal FAPbBr_(3) NCs with different sizes by changing the molar ratio of FABr/PbBr_(2) in the precursor solution,using ligand assisted precipitation(LARP)technology at room ***(PL)and time resolved photoluminescence(TRPL)spectroscopy were measured to characterize their ASE *** their nonlinear optical properties were studied through the Zscan technique and the two-photon excited fluorescence *** stimulated emission properties including oneand two-photon pumped ASE have been realized from FAPbBr_(3) *** large two-photon absorption coefficient(0.27 cm/GW)and high non-linear absorption cross-section(7.52×10^(5) GM),ASE with threshold as low as 9.8μJ/cm^(2) and 487μJ/cm^(2) have been obtained from colloidal FAPbBr_(3) NCs using one-and two-photon *** results indicate that as a new possible green-emitting frequency-upconversion material with low thresholds,FAPbBr_(3) NCs hold great potential in the development of high-performance two-photon pump lasers.

关键词： perovskites formamidinium lead bromide nanocrystals nonlinear optical gain amplified spontaneous emission

Theoretical study of defect impact on two-dimensional MoS_2

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Journal of Semiconductors 2015年第12期36卷 18-23页

作者： Anna V.Krivosheeva Victor L.Shaposhnikov Victor E.Borisenko Jean-Louis Lazzari Chow Waileong Julia Gusakova beng kang tay Belarusian State University of Informatics and Radioelectronics CNRS Aix-Marseille Université NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University CINTRA CNRS NTUTHALES Nanyang Technological University

Our theoretical findings demonstrate for the first time a possibility of band-gap engineering of monolayer MoS2 crystals by oxygen and the presence of vacancies. Oxygen atoms are revealed to substitute sulfur ones, forming stable MoS2-xOx ternary compounds, or adsorb on top of the sulfur atoms. The substituting oxygen provides a decrease of the band gap from 1.86 to 1.64 eV and transforms the material from a direct-gap to an indirect-gap semiconductor. The surface adsorbed oxygen atoms decrease the band gap up to 0.98 eV depending on their location tending to the metallic character of the electron energy bands at a high concentration of the adsorbed atoms. Oxygen plasma processing is proposed as an effective technology for such band-gap modifications.

关键词： two-dimensional crystal molybdenum disulfide band gap vacancy oxygen

Theoretical study of defect impact on two-dimensional MoS

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Journal of Semiconductors 2015年第12期 22-27页

Our theoretical findings demonstrate for the first time a possibility of band-gap engineering of monolayer MoS;crystals by oxygen and the presence of vacancies. Oxygen atoms are revealed to substitute sulfur ones, forming stable MoS;O;ternary compounds, or adsorb on top of the sulfur atoms. The substituting oxygen provides a decrease of the band gap from 1.86 to 1.64 eV and transforms the material from a direct-gap to an indirect-gap semiconductor. The surface adsorbed oxygen atoms decrease the band gap up to 0.98 eV depending on their location tending to the metallic character of the electron energy bands at a high concentration of the adsorbed atoms. Oxygen plasma processing is proposed as an effective technology for such band-gap modifications.

关键词： two-dimensional crystal molybdenum disulfide band gap vacancy oxygen

Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime

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Light(Science & Applications) 2019年第1期8卷 1099-1107页

作者： Hangyong Shan Ying Yu Xingli Wang Yang Luo Shuai Zu Bowen Du Tianyang Han Bowen Li Yu Li Jiarui Wu Feng Lin Kebin Shi beng kang tay Zheng Liu Xing Zhu Zheyu Fang School of Physics State Key Lab for Mesoscopic Physics/Academy for Advanced Interdisciplinary Studies/Collaborative Innovation Center of Quantum MatterPeking University100871 BeijingChina CNRS International-NTU-Thales Research Alliance(CINTRA) Nanyang Technological UniversitySingapore 637553Singapore Centre for Micro-/Nano-Electronics(NOVITAS) School of Electrical and Electronic Engineering/Centre for Programmed MaterialsSchool of Materials Science and EngineeringNanyang Technological UniversitySingapore 637553Singapore

Achieving strong coupling between plasmonic oscillators can significantly modulate their intrinsic optical ***,we report the direct observation of ultrafast plasmonic hot electron transfer from an Au grating array to an MoS_(2) monolayer in the strong coupling regime between localized surface plasmons(LSPs)and surface plasmon polaritons(SPPs).By means of femtosecond pump-probe spectroscopy,the measured hot electron transfer time is approximately 40 fs with a maximum external quantum yield of 1.65%.Our results suggest that strong coupling between LSPs and SPPs has synergetic effects on the generation of plasmonic hot carriers,where SPPs with a unique nonradiative feature can act as an‘energy recycle bin’to reuse the radiative energy of LSPs and contribute to hot carrier *** energy exchange between plasmonic modes in the strong coupling regime can further enhance the vertical electric field and promote the transfer of hot electrons between the Au grating and the MoS_(2) *** proposed plasmonic strong coupling configuration overcomes the challenge associated with utilizing hot carriers and is instructive in terms of improving the performance of plasmonic opto-electronic devices.

关键词： properties coupling transfer

Effect of Different Types of Wing-Wing Interactions in Flapping MAVs

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Journal of Bionic Engineering 2017年第1期14卷 60-74页

作者： Wee beng tay Temasek Laboratories National University of Singapore 5A Engineering Drive 1 117411 Singapore

Wing-Wing Interaction （WWI）, such as the Clap and Fling Motion （CFM）, occurs when two wings are flapping close together, improving performance. We intend to design a hovering Flapping Micro Aerial Vehicle （FMAV） which makes use of WWI. We investigate the effects of flexibility, kinematic motions, and two- to six-wing flapping configurations on the FMAV through numerical simulations. Results show that a rigid spanwise and flexible chordwise wing produces the highest lift with minimum power. The smoothly varying sinusoidal motion, which is visually similar to the CFM, produces similar lift in comparison to the CFM, while having lower peak power requirement. Lastly, lift produced by each wing of the two-, four-, six-wing configurations is approximately equal. Hence more wings generate higher total lift force, but at the expense of higher drag and power requirement. These results will be beneficial in the understanding of the underlying aerodynamics of WWI, and in improving the performance of our FMAV.

关键词： flapping wings MAV immersed boundary methods clap and fling

Application and Improvements of the Wing Deformation Capture with Simulation for Flapping Micro Aerial Vehicle

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Journal of Bionic Engineering 2020年第6期17卷 1096-1108页

作者： Wee-beng tay Siddharth Jadhav Jian-Lei Wang Centre for Aerodynamics&Propulsion Temasek LaboratoriesNational University of SingaporeSingapore 117411Republic of Singapore Shaanxi Aerospace Flight Vehicle Design Key Laboratory School of AstronauticsNorthwestern Polytechnical UniversityXi'an 710072China

Wing deformation capture with simulation is a mixed experimental-numerical approach whereby the wing deformation during flapping is captured using high-speed cameras and used as an input for the numerical *** is an alternative approach compared to pure experiment or full fluid structure interaction *** study is an update to the previous paper by tay et al.,which aims to address the previous *** show through thrust and vorticity contour plots that this approach can simulate Flapping Micro Aerial Vehiclex(FMAVs)with reasonable ***,we use this approach to explain the thrust improvement when an additional rib is added to the original membrane wing,which is due to longer duration for the new wing to open during the fling ***,by decreasing the number of points and frames per cycle on the wing,we can simplify and shorten the digitization *** results show that this approach is an accurate and practical alternative which can be applied to general bio-inspired research.

关键词： flapping MAV immersed boundary method wing deformation membrane wings

Numerical Simulation of Flapping Wing MAVs in V-formation

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Journal of Bionic Engineering 2019年第2期16卷 264-280页

作者： Wee-beng tay Kishen Raj Murugaya Woei-Leong Chan Boo-Cheong Khoo Temasek Laboratories National University of Singapore5A Engineering Drive 1117411Republic of Singapore Department of Mechanical Engineerings National University of Singapore 5A Engineering Drive 1117411Republic of Singapore

The purpose of this research is to understand the aerodynamics of Flapping wing Micro Aerial Vehicles(FMAVs)flying in V-formation and how V-fbrmation can improve the endurance of *** tested FMAVs with two types of flapping kinematics:(1)idealized sinusoidal flapping/pitching motion,(2)actual FMAV wing deformation *** the design of experiment methodology,together with an immersed boundary method numerical solver,we investigate the effects of phase angle and x,v,z separation between the wings on the FMAVs'*** show that it is possible to obtain an overall thrust and lift improvement of up to 25%and 14%respectively,or a reduction of both 19%,compared to the single wing ***,for certain cases,we extend another row,leading to a total of five *** show that in general,the additional thrust or lift experienced by the second row of wings is also experienced by the third row of ***,this may apply to subsequent rows too.

关键词： flapping wing V-fbrmation immersed boundary methods MAV design of experiment