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A self-driven photodetector based on a SnS_(2)/WS_(2) van der Waals heterojunction with an Al_(2)O_(3) capping layer

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Chinese Physics B 2023年第1期32卷 585-591页

作者：王祥骏林钰恒刘潇邓煊华贲建伟俞文杰朱德亮刘新科 College of Materials Science and Engineering Institute of Microelectronics(IME)Guangdong Research Center for Interfacial Engineering of Functional MaterialsShenzhen UniversityShenzhen 518060China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Photodetectors based on two-dimensional(2D) materials have attracted considerable attention because of their unique properties. To further improve the performance of self-driven photodetectors based on van der Waals heterojunctions, a conductive band minimum(CBM) matched self-driven SnS_(2)/WS_(2) van der Waals heterojunction photodetector based on a SiO2/Si substrate has been designed. The device exhibits a positive current at zero voltage under 365 nm laser *** is attributed to the built-in electric field at the interface of the SnS_(2) and WS_(2) layer, which will separate and transport the photogenerated carriers, even at zero bias voltage. In addition, the Al_(2)O_(3) layer is covered by the surface of the SnS_(2)/WS_(2) photodetector to further improve the performance, because the Al_(2)O_(3) layer will introduce tensile stress on the surface of the 2D materials leading to a higher electron concentration and smaller effective mass of electrons in the films. This work provides an idea for the research of self-driven photodetectors based on a van der Waals heterogeneous junction.

关键词： SnS_(2)/WS_(2)heterogeneous junction Al_(2)O_(3)layer self-driven photodetector

Highly efficient 1D p-Te/2D n-Bi_(2)Te_(3) heterojunction self-driven broadband photodetector

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Nano Research 2024年第3期17卷 1864-1874页

作者： Chenchen Zhao Dongbo Wang Jiamu Cao Zhi Zeng Bingke Zhang Jingwen Pan Donghao Liu Sihang Liu Shujie Jiao Tianyuan Chen Gang Liu Xuan Fang Liancheng Zhao Jinzhong Wang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Astronautics Harbin Institute of TechnologyHarbin 150001China Center for High Pressure Science and Technology Advanced Research Shanghai 201203China State Key Laboratory of High Power Semiconductor Lasers Changchun University of Science and TechnologyChangchun 130022China

Broadband photodetectors with self-driven functions have attracted intensive scientific interest due to their low energy consumption and high optical ***,high-performance broadband self-driven photodetectors are still a significant challenge due to the complex fabrication processes,environmental toxicity,high production costs of traditional 3D semiconductor materials and sharply raised contact resistance,severe interfacial recombination of 2D materials and 2D/3D mixed dimension ***,1D p-Te/2D n-Bi_(2)Te_(3) heterojunctions are constructed by the simple and low-cost hydrothermal method.1D p-Te/2D n-Bi_(2)Te_(3) devices are applied in photoelectrochemical(PEC)photodetectors,with their high performance attributed to the good interfacial contacts reducing interface *** device demonstrated a broad wavelength range(365–850 nm)with an Iph/Idark as high as *** R_(i),D^(*),and external quantum efficiency(EQE)values of the device were as high as 12.07 mA/W,5.87×10^(10) Jones,and 41.05%,respectively,which were significantly better than the performance of the prepared Bi_(2)Te_(3) and Te devices.A comparison of the freshly fabricated device and the device after 30 days showed that 1D p-Te/2D n-Bi_(2)Te_(3) had excellent stability with only 18.08%decay of *** is anticipated that this work will provide new emerging material for future design and preparation of a high-performance self-driven broadband photodetector.

关键词： topological insulating states interfacial recombination self-driven 1D p-Te/2D n-Bi_(2)Te_(3) photodetector

Characterization of self-driven Cascode-Configuration Synchronous Rectifiers

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第6期36卷 902-911页

作者： REN Xiaoyong LI Kunqi CHEN Qianhong Aero-Power Sci-Tech Center College of Automation EngineeringNanjing University of Aeronautics and Astronautics

This paper presents a cascode configuration synchronous rectifier device based on silicon MOSFET and Schottky diode,which can replace traditional power diode *** structure has self-driven ability with simple external circuit,and the conduction characteristic is preferable to a power *** characterization and switching behavior analysis of proposed structure are conducted in this *** switching process is illustrated in detail using real model which considers the parasitic inductances and the nonlinearity of junction *** real time internal voltage and current value during switching transition are deduced with the equivalent *** validate the analysis,two voltage specification rectifiers are ***,double-pulse test results and the practical design example verify the performance advantages of proposed structure.

关键词： synchronous rectifier(SR) self-driven cascode structure power diode

Droplet self-driven Characteristics on Wedge-Shaped Surface with Composite Gradients:A Molecular Dynamics Study

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Frontiers in Heat and Mass Transfer 2024年第4期22卷 1071-1085页

作者： Haowei Hu Xinnuo Chen Qi Wang Qin Li Dong Niu Mu Du School of Environment and Energy Engineering Anhui Jianzhu UniversityHefei230601China Engineering Research Center of Building Energy Efficiency Control and Evaluation Ministry of EducationAnhui Jianzhu UniversityHefei230022China School of Materials and Chemical Engineering Anhui Jianzhu UniversityHefei230601China Institute of Refrigeration&Cryogenics Engineering Dalian Maritime UniversityDalian116026China Shenzhen Research Institute of Shandong University Shandong UniversityShenzhen518057China

The self-driven behavior of droplets on a functionalized surface,coupled with wetting gradient and wedge patterns,is systematically investigated using molecular dynamics(MD)*** effects of key factors,including wedge angle,wettability,and wetting gradient,on the droplet self-driving effect is revealed from the *** indicate that the maximum velocity of droplets on hydrophobic wedge-shaped surfaces increases with the wedge angle,accompanied by a rapid attenuation of driving force;however,the average velocity decreases with the increased wedge ***,droplet movement on hydrophilic wedge-shaped surfaces follows the opposite trend,particularly in terms of average velocity compared to the hydrophobic *** wedge-shaped and composite gradient wedge-shaped surfaces are found to induce droplet motion,with droplets exhibiting higher speeds and distances on hydrophobic surfaces compared to hydrophilic surfaces,regardless of surface ***,the inclusion of wettability gradients significantly influences droplet motion,with hydrophobic composite gradient wedge-shaped surfaces showing considerable improvements in droplet speed and distance compared to their hydrophilic *** combining suitable wettability gradients with wedge-shaped surfaces,the limitations inherent in the wettability gradient range and wedge-shaped configuration can be mitigated,thereby enhancing droplet speed and *** findings presented in this paper offer valuable insights for the design of advanced functional surfaces tailored for manipulating droplets in real-world applications.

关键词： self-driven wettability gradient wedge-shaped surface composite gradient

RESEARCH ON KEY TECHNIQUE OF THE NEW TYPE self-driven TOWING MACHINE FOR CABLE

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RESEARCH ON KEY TECHNIQUE OF THE NEW TYPE SELF-DRIVEN TOWING...

A cellular automata evacuation model considering friction and repulsion

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： WANG Hui*, , LI Gangyan, LI Guifu*, YANG Kesen* *School of Mechanical Engineering, Jinan University, Jinan 250022,School of Mechanical and Electronic Engineering of Wuhan University of Technology, Wuhan 430070, China

Towing machine plays an important and key role in building cable network. However most of employed equipment that mainly depends on importation at present is unable to meet the requirement of building

关键词： self-driven towing machine key technique.

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Science China(Technological Sciences) 2005年第4期48卷 403-413页

作者： SONG Weiguo YU Yanfei FAN Weicheng Zhang Heping State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230027 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230027 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230027 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230027 China

There exist interactions among pedestrians and between pedestrian and environment in evacuation. These interactions include attraction, repulsion and friction that play key roles in human evacuation behaviors, speed and efficiency. Most former evacuation models focus on the attraction force, while repulsion and friction are not well modeled. As a kind of multi-particle self-driven model, the social force model introduced in recent years can represent those three forces but with low simulation efficiency because it is a continuous model with complex rules. Discrete models such as the cellular automata model and the lattice gas model have simple rules and high simulation efficiency, but are not quite suitable for interactions’ simulation. In this paper, a new cellular automata model based on traditional models is introduced in which repulsion and friction are modeled quantitatively. It is indicated that the model can simulate some basic behaviors, e.g. arching and the “faster-is-slower” phenomenon, in evacuation as multi-particle self-driven models, but with high efficiency as the normal cellular automata model and the lattice gas model.

关键词： evacuation, cellular automata, multi-particle self-driven model, lattice gas.

Controllable dispersion and reunion of liquid metal droplets

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Science China Materials 2019年第3期62卷 407-415页

作者： Sen Chen Yujie Ding Qinglei Zhang Lei Wang Jing Liu Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China

Liquid metal(LM) micro-droplets have been widely used in microfluidics, drug-loaded nano-system and micro-nano machine due to its excellent properties. However,there still exist difficulties in succinctly dispersing a bulk of LM into micro-droplets due to the large interfacial ***, the controllable switching between droplet dispersion and reunion is yet to be realized. Herein, a practical and efficient method for dispersing LM was proposed and the controllable switching between dispersion and reunion of LM droplets was achieved. LM micro-droplets were produced by vibrating the LM immersed in a mixture of N,N-dimethylformamide(DMF) and polyvinyl chloride(PVC). The experimental results show that the size distribution of LM micro-droplets could be tuned by controlling the vibration frequency. More intriguingly, the dispersion and reunion of LM droplets can be switched intelligently through tuning the vibration frequency and amplitude. Furthermore, optical properties of the LM micro-droplet coating were evaluated to display potential applications. A self-driven motion of PVCcoated LM could be achieved by utilizing the produced LM micro-droplets based on the Marangoni effect, which holds promising value for developing future transport tool of LM droplets. The present work suggests an entirely feasible method for dispersing and utilizing LM droplets, which is of great significance for promoting the development of LM micro-droplet science and technology.

关键词： liquid metal micro-droplet dispersion and reunion self-driven motion optical property

self-Adaptive Faulted Spacecraft Attitude Adjustment Event-Triggered Control Via Reinforcement Learning Critic Mechanism

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Self-Adaptive Faulted Spacecraft Attitude Adjustment Event-T...