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Van der Waals heterojunction ReSe_(2)/WSe_(2)polarization-resolved photodetector

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Journal of Semiconductors 2021年第3期42卷 45-49页

作者： Xiaoyu Tian yushen liu School of Mechanical and Electrical Engineering Soochow UniversitySuzhou 215137China School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215556China

Polarization-resolved photodetectors,a significant branch of photodetection,can more effectively distinguish the target from the background by exploiting polarization-sensitive ***,due to the absence of intrinsic polarized absorption properties of many materials,there is still a great challenge to develop the high-performance polarization-resolved ***,we report a van der Waals heterojunction(vdWH)ReSe_(2)/WSe_(2)photodetector,which performs a high responsivity of~0.28 A/W and a high detectivity of 1.1×10^(12)Jones under the illumination of 520 nm laser at room ***,scanning photocurrent mapping(SPCM)measurements demonstrate the photoresponse of devices closely depend on the polarized angle of the incident light,indicating the effective polarized light *** work paves the way to develop high-performance polarization-resolved photodetectors based on two-dimensional(2D)materials.

关键词： ReSe_(2)/WSe_(2) photodetector polarization

二氧化硅/金属镍/有序介孔碳复合材料的制备及其吸波性能研究

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曲阜师范大学学报（自然科学版） 2024年第3期50卷 1-8,F0002页

作者：刘玉申周潘潘况亚伟盐城工业职业技术学院智能制造学院盐城市224005 常熟理工学院电子信息工程学院江苏省苏州市215500

以苯酚、甲醛、F127、正硅酸乙酯和六水合氯化镍为原料,通过溶剂挥发诱导自组装法和热处理工艺原位合成了二氧化硅/金属镍/有序介孔碳复合材料.通过改变镍粒子的复合量,可以调节材料的石墨化程度、镍纳米颗粒尺寸和磁性,从而优化整体的... 详细信息

以苯酚、甲醛、F127、正硅酸乙酯和六水合氯化镍为原料,通过溶剂挥发诱导自组装法和热处理工艺原位合成了二氧化硅/金属镍/有序介孔碳复合材料.通过改变镍粒子的复合量,可以调节材料的石墨化程度、镍纳米颗粒尺寸和磁性,从而优化整体的电磁波吸收性能.采用XRD、Raman、SEM、TEM、XPS和VSM等多种测试手段表征了其相组成、缺陷、形貌、镍纳米粒子的大小、磁性能等基本特性.实验结果表明,增大镍纳米粒子的复合量可以有效提高材料的饱和磁化强度和磁损耗性能,但过大的复合量会引起镍颗粒的团聚,从而削弱界面极化作用.以OS@Ni1.5-700为吸收剂的吸波涂层在4.0 mm厚度下,最小反射损耗值达到-36.5 dB,在更薄的厚度时(2.5 mm),有效吸波频宽拓展到了8.16 GHz(9.36 GHz~17.52 GHz).

关键词：有序介孔碳磁电协同吸波

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FRONTIER OF LAWIN CHINA, RENMIN LAW SCHOOL, AND HARVARD PROJECT ON DISABILITIES CO-HOST ＂THE INTERNATIONAL CONFERENCE ON DISABILITY RIGHTS＂

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Frontiers of Law in China-Selected Publications from Chinese Universities 2015年第4期10卷 755-758页

作者： liu yushen XU Yelin ZUO Zhenbin ZHAO Xiaoyan School of Law Renmin University of China Beijing 100872China School of Law Renmin University of China Beijing 100872 China

On May 28, 2015, the participants of ＂The International Conference on Disability Rights＂ gathered in Mingde Law Building of Renmin University to discuss the cutting edge issues on disability rights in China and worldwide. The representatives from Disabled People＇s Organizations （DPOs）, the parent group of persons with disabilities,

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Effects of LaNiO_3 Interlayer on the Microstructures and Electrical Properties of Ba_(0.9)Sr_(0.1)Ti_(0.99)Mn_(0.01)O_3 Multilayer

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Journal of Wuhan University of Technology(Materials Science) 2016年第6期31卷 1280-1283页

作者：洪学鹍 shao tan shao xueyi wang tao 张德宝 liu yushen feng jinfu College of Physics and Electronic Engineering Changshu Institute of Technology Changshu 215500 China

The aim of this work was to investigate the effects of low-resistivity interlayer on the physical properties of periodic Ba_（0.9）Sr_（0.1）Ti_（0.99）Mn_（0.01）O_3（BSTM） multilayers prepared by a chemical solution deposition method. A LaNiO_3（LNO） layer was inserted into the periodic BSTM multilayer artificially to form a sandwiched configuration of BSTM/LNO/BSTM. The capacitances at low frequencies（〈100 k Hz） of the sandwiched multilayer are significantly enhanced compared to that of the pure BSTM multilayer. The space charge accumulated at the LNO layer was proposed to explain the enhancement based on Maxwell-Wagner（M-W） model. However, LNO interlayer leads to an increase in the leakage current. A non-Ohmic conduction region is observed for BSTM/LNO/BSTM multilayer when the electric field exceeds 100 k V/cm. The results offer a new approach to achieve dielectric films with high dielectric constant.

关键词： BSTM multilayers LNO M-W model

Generation of entangled photon states with nonlinear metamaterials

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Generation of entangled photon states with nonlinear metamat...

Tailoring Bi_(2)Te_(3) edge with semiconductor and metal properties under electron beam irradiation

第十八届全国量子光学学术会议

作者：明阳 Jie Tang Wang Zhang yushen liu 南京大学 College of Engineering and Applied Sciences Nanjing University School of Physics and Electronic Engineering Changshu Institute of Technology

Photonic entanglement is an important physical resource for quantum information applications, including quantum computation and quantum communication [1]. In the present work, we investigate generating entangled photons with desired properties based on nonlinear metamaterials. Metamaterials are artificial structures with unique properties which are not attainable with naturally existing materials [2]. The designability and flexibility of the nonlinear metamaterial system are of great value for tailoring entangled states. Through design the nanostructures, we can control the PDC process inside the corresponding medium to generate entangled photons with special spatial properties such as orbital angular momentum（OAM）. Here we practically consider a split ring resonator（SRR） array system. To describe the PDC process in nonlinear metamaterials, we develop a differential approach. The interaction medium may be divided into a series of differential elements along the longitudinal direction. The 3 D nonlinear metamaterials can be constructed through stacking 2 D metamaterial slices, and a 2 D slice plays as a dz-element. In each element, the lossy nonlinear interaction process could be equivalently compartmentalized into two cascaded sub-processes. For the first sub-process, we consider the PDC without loss. A local interaction Hamiltonian is utilized to describe this process. For this Hamiltonian, according to the nonlinear Huygens–Fresnel principle [3], it will be the integral of the contributions of the SRR meta-atom over the whole volume of the nonlinear metamaterials. For the second sub-process, the attenuation is equivalent as a beam splitter transformation. The final results can be obtained through combining all these dz-elements in sequence. As regards the generation of OAM entangled state, we introduce a special pattern called "fork grating" into the metamaterial system. The calculations are done based on a practical system in which the meta-atoms consist of gold

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Nano Research 2022年第5期15卷 4710-4716页

作者： Ning Cao Peng liu Jialiang Pan Liheng Liang Kunpeng Cai Qingguo Shao Hongwei Zhu Xiaobei Zang School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

In pursuit of miniaturization in the semiconductor industry,two-dimensional(2D)materials are used to fabricate new electronic *** topological insulator(TI)material bismuth telluride(Bi_(2)Te_(3)),as an emerging 2D material,has potential applications in electronic and spintronic devices due to its unique electrical *** is well known that the surface-to-volume ratio increases as the thickness of the material decreases,resulting in a more prominent edge ***,for a single-layer Bi_(2)Te_(3),the atomic structure of the edge plays a crucial role in its electrical ***,combining first-principles calculations and in situ transmission electron microscopy(TEM)experimental studies,we report that there are two types of edge structures in single-layer Bi2Te3:semiconducting flat edges and metallic zigzag *** dynamic evolution process of the edge structure with atomic resolution shows that the proportions of these two edges change with continuous electron beam *** findings demonstrate the viability to use electron beam as an effective tool to precisely tailor the edge of Bi_(2)Te_(3) with desired properties,which paves the way for implementation of single-layer Bi2Te3 in electronics and spintronics.

关键词： Bi_(2)Te_(3)edge electron beam irradiation in situ transmission electron microscopy(TEM) atomic precision

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实体造型系统中消除自交的拔模操作

计算机辅助设计与图形学学报 2011年第12期23卷 2074-2080页

作者：严冬明张慧刘玉身 Geometric Modeling and Scientific Visualization Center King Abdullah University of Science and TechnologyThuwal23955-6900 Kingdom of Saudi Arabia 清华大学软件学院

拔模操作在计算机辅助模具设计和制造领域有着非常广泛的应用.文中提出一个基于边界表示的拔模算法,克服了现有算法只能添加较小的拔模角度、保持模型连接关系不变的缺点.该算法首先生成一个初始的拔模体,然后对初始体的不合法面进行处... 详细信息

拔模操作在计算机辅助模具设计和制造领域有着非常广泛的应用.文中提出一个基于边界表示的拔模算法,克服了现有算法只能添加较小的拔模角度、保持模型连接关系不变的缺点.该算法首先生成一个初始的拔模体,然后对初始体的不合法面进行处理,最后采用一个启发式的搜索算法生成拔模体.与已有的算法比较,文中算法更加鲁棒,提高了拔模的造型能力,可适用于更多的情况.

关键词：边界表示拔模操作求交

Optical design of perovskite/c-silicon tandem solar cell with Ag grating back reflectors

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Optical design of perovskite/c-silicon tandem solar cell wit...

Effect of sound speed profile on the structure of long-range acoustic pulse

第六届新型太阳能电池材料科学与技术学术研讨会

作者： Yawei Kuang Shuchang Wang Qingzhu Wei Yulong Ma Shuchang Wang yushen liu School of Physics and Electronic Engineering Changshu Institute of Technology

Tandem cells are solar cells made of multiple junctions with tunable absorbing materials, which aim to overcome the Shockley–Queisser limit of single junction solar cells. Recently, organic–inorganic hybrid perovskite solar cells have stirred enormous interest as ideal candidates for tandem cells, due to high open circuit voltage, relatively wide optical bandgap, and low temperature solution processibility. Light trapping is one of the key issues to improve the light absorption and increase the efficiency of tandem solar cells. The absorption of perovskite/c-Si tandem solar cells with metal Ag grating are systematically researched by utilizing finite difference time domain(FDTD) method. The results show that metal grating back reflector can mainly enhance the absorption of infrared light for solar cells. When the metal grating with the structural parameters of period is 500 nm, height is 100 nm, and duty cycle is 0.5, the average absorption rate of the solar cells in wavelength range of 800～1100 nm can be improved by 55.4% via replacing only Al back film. Due to the excellent reflection characteristics of metal grating, the transmitted light is reflected back to absorbing layer, so that it can be absorbed two or more times. So the absorption efficiency of tandem solar cells can be improved greatly.

关键词： perovskite tandem solar cell Ag grating

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Chinese Journal of Acoustics 2024年第1期43卷 64-81页

作者： WU Shuanglin QIN Jixing LI Zhenglin WU yushen ZHANG Renhe State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049 School of Ocean Engineering and Technology Sun Yat-sen UniversityZhuhai 519000 Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082

The time arrival structure of acoustic pulse signals propagating in ocean waveguides is of great significance for underwater acoustic communication and navigation. Using the deep-sea sound propagation data from the experiments respectively conducted in the East Indian Ocean(EIO) and the South China Sea(SCS) with explosion sources near the sound channel axis(SCA), long-range transmission loss(TL) and time arrival structure of acoustic pulses for different sound speed profiles(SSPs) are compared. In the EIO environment, sound energy transmitting along the SCA is relatively large, and the corresponding signals arrive first, whereas signals propagating away from the SCA arrive late. In the full receiving depth, it shows a branch structure where the waveform near the SCA arrives earlier than other depths, which is totally different with the characteristics of the sound pulse in the SCS. Combined with the parametric mathematical model of deep-sea sound channel, the influence mechanism of SSP on the time arrival structure of long-range pulse propagation is theoretically analyzed, which well explains the phenomenon observed in the two experiments.

关键词： depths Indian sound