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Simulation and structure optimization of triboelectric nanogenerators considering the effects of parasitic capacitance

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nano Research 2017年第1期10卷 157-171页

作者： Keren Dai Xiaofeng Wang Simiao Niu Fang Yi Yajiang Yin Long Chen Yue Zhang Zheng You Collaborative Innovation Center for Micro/Nano Fabrication Device and System State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing 100084 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA30332-0245 USA State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering Bei)ing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China Broadcom Ltd. 2901 Via Fortuna #400 Austin TX 78746 USA

Parasitic capacitance is an unavoidable and usually unwanted capacitance that exists in electric circuits, and it is the most important second-order non-ideal effect that must be considered while designing a triboelectric nanogenerator （TENG） because its magnitude is comparable to the magnitude of the TENG capacitance. This paper investigates the structure and performance optimization of TENGs through modeling and simulation, taking the parasitic capacitance into account. Parasitic capacitance is generally found to cause severe performance degradation in TENGs, and its effects on the optimum matching resistance, maximum output power, and structural figures-of-merit （FOMs） of TENGs are thoroughly investigated and discussed. Optimum values of important structural parameters such as the gap and electrode length are determined for the different working modes of TENGs, systematically demonstrating how these optimum structural parameters change as functions of the parasitic capacitance. Additionally, it is demonstrated that the parasitic capacitance can improve the height tolerance of the metal freestanding-mode TENGs. This work provides a theoretical foundation for the structure and performance optimization of TENGs for practical applications and promotes the development of mechanical energy-harvesting techniques.

关键词： triboelectric nanogenerator parasitic capacitance figure of merit structure optimization performance optimization

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Tuned single atom coordination structures mediated by polarization force and sulfur anions for photovoltaics

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nano Research 2021年第11期14卷 4025-4032页

作者： Hongyu Jing Zhengyan Zhao Chunyang Zhang Wei Liu Danyang Wu Chao Zhu Ce Hao Jiangwei Zhang Yantao Shi State Key Laboratory of Fine Chemicals Department of ChemistrySchool of Chemical EngineeringDalian University of TechnologyDalian116024China Department of Chemistry Tsinghua UniversityBeijing100084China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjing210096China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

Impeding high temperature sintering is challengeable for synthesis of carbon-supported single-atom catalysts (C-SACs), which requires high-cost precursor and strictly-controlled procedures. Herein, by virtue of the ultrastrong polarity of salt melts, sintering of metal atoms is effectively suppressed. Meanwhile, doping with inorganic sulfur anions not only produces sufficient anchoring sites to achieve high loading of atomically dispersed Co up to 13.85 wt.%, but also enables their electronic and geometric structures to be well tuned. When served as a cathode catalyst in dye-sensitized solar cells, the C-SAC with Co-N4-S2 moieties exhibits high activity towards the iodide reduction reaction (IRR), achieving a higher power conversion efficiency than that of conventional Pt counterpart. Density function theory (DFT) calculations revealed that the superior IRR activity was ascribed to the unique structure of Co-N4-S2 moieties with lower reaction barriers and moderate binding energy of iodine on the Co center, which was beneficial to I2 dissociation.

关键词： inorganic sulfur ions coordination structure regulating anti-sintering dye-sensitized solar cells

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A platform for integrated spectrometers based on solution-processable semiconductors

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Light(science & Applications) 2023年第9期12卷 1739-1748页

作者： Yanhao Li Xiong Jiang Yimu Chen Yuhan Wang Yunkai Wu De Yu Kaiyang Wang Sai Bai Shumin Xiao Qinghai Song Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of Technology(Shenzhen)ShenzhenGuangdong 518055China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 611731China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShan`xi 030006China

Acquiring real-time spectral information in point-of-care diagnosis,internet-of-thing,and other lab-on-chip applications require spectrometers with hetero-integration capability and miniaturized *** to conventional semiconductors integrated by heteroepitaxy,solution-processable semiconductors provide a much-flexible integration platform due to their solution-processability,and,therefore,more suitable for the multi-material integrated ***,solution-processable semiconductors are usually incompatible with the micro-fabrication *** work proposes a facile and universal platform to fabricate integrated spectrometers with semiconductor substitutability by unprecedently involving the conjugated mode of the bound states in the continuum(conjugated-BIC)***,exploiting the conjugated-BIC photonics,which remains unexplored in conventional lasing studies,renders the broadband photodiodes with ultra-narrowband detection ability,detection wavelength tunability,and on-chip integration ability while ensuring the device *** based on these ultra-narrowband photodiode arrays exhibit high spectral resolution and wide/tunable spectral *** fabrication processes are compatible with solution-processable semiconductors photodiodes like perovskites and quantum dots,which can be potentially extended to conventional *** from the spectrometers directly constitute the incident spectra without being computation-intensive,latency-sensitive,and *** an example,the integrated spectrometers based on perovskite photodiodes are capable of realizing narrowband/broadband light reconstruction and in-situ hyperspectral imaging.

关键词： semiconductors process integration

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In Situ Liquid Cell Transmission Electron microscopy Observations of Growth and Anticorrosion Behaviors of AuCl_(3) Shell on Au nanobipyramids

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Chinese Journal of Chemistry 2024年第22期42卷 2757-2764页

作者： Wei Wei Jun Sun Songtao Zhang Litao Sun Feng Xu School of Information Technology Jiangsu Open UniversityNanjingJiangsu 210036China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjingJiangsu 210096China Testing Center Yangzhou UniversityYangzhouJiangsu 225009China

Designing new materials and architectures to maintain activity and stability requires a better understanding on the anticorrosion dynamics of ***-coordinated atoms on the surface of nanoparticles can be protected by deposited ***-time observation on how protective shells grow and play a role is challenging but ***,protective effects of AuCl_(3) shells on Au nanobipyramids(NBPs)are studied in HAuCl_(4) aqueous solutions by in-situ liquid cell transmission electron microscopy(LCTEM).This study is the first to observe the formation of Au-AuCl_(3) core-shell nanostructure and the corresponding anticorrosion behaviors of AuCl_(3) deposited *** presence of CTAB can substantially influence the growth mode and structure of AuCl_(3) shell,by a direct or indirect way,intervene the dissolution of Au *** growth or dissolution kinetics here revealed at the nanoscale provide insights towards engineering of the surface anticorrosion to pursue Au nanoparticles with improved stability in acidic environment.

关键词： In situ liquid cell TEM Au-AuCl_(3)core-shell Growth process Anticorrosion behavior nanotechnology Synthesis design Crystal structure

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fundamentals of phase-only liquid crystal on silicon (LCOS) devices

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Light(science & Applications) 2014年第1期3卷 43-52页

作者： Zichen Zhang Zheng You Daping Chu State Key Laboratory of Precision Measurement Technology and Instruments Collaborative Innovation Center for Micro/Nano FabricationDevice and SystemDepartment of Precision InstrumentTsinghua UniversityBeijing 100084China Electrical Engineering Division Department of EngineeringUniversity of CambridgeCambridge CB30FAUK

This paper describes the fundamentals of phase-only liquid crystal on silicon(LCOS)technology,which have not been previously discussed in *** technology is widely utilized in high efficiency applications for real-time holography and diffractive *** paper begins with a brief introduction on the developmental trajectory of phase-only LCOS technology,followed by the correct selection of liquid crystal(LC)materials and corresponding electro-optic effects in such *** is focused on the essential requirements of the physical aspects of the LC layer as well as the indispensable parameters for the response time of the ***,the basic functionalities embedded in the complementary metal oxide semiconductor(CMOS)silicon backplane for phase-only LCOS devices are illustrated,including two typical addressing ***,the application of phase-only LCOS devices in real-time holography will be introduced in association with the use of cutting-edge computer-generated holograms.

关键词： electro-optic effect liquid crystal material liquid crystal on silicon device real-time holography

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Numerical optimization approach of the gap between the magnet and coil for electromagnetic vibration energy harvesters design

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key Engineering Materials 2015年 645卷 1214-1222页

作者： Lei, Yiming Wen, Zhiyu Key Laboratory of Fundamental Science on Micro/Nano Device and System Technology Chongqing University China National Center for International Research of Micro/Nano System and New Material Technology Chongqing University China Micro system Research Center of Chongqing University Chongqing China

In the design of the micro electromagnetic vibration harvester, an important goal is maximization of the magnetic flux linkage gradient, which directly determines the induced voltage and output power of the electromagnetic vibration harvester. This paper established a numerical model based on structure of the electromagnetic vibration energy harvester. An analytic expression for the magnetic field of rectangular permanent magnets is used to build up an electromagnetic coupling model. The magnetic field distribution of the rectangular permanent magnet was analyzed. The effects of the gap between the magnet and the coil on the load voltage of the electromagnetic vibration energy harvester were investigated. According to the formula, the magnetic flux linkage and flux gradient were calculated to optimize the geometrical parameter of the magnet and coil. The method and boundary conditions of optimizing the gap between the magnet and coil were presented. The maximum output voltage can be obtained by optimizing the gap between the magnet and the coil. A simple prototype was fabricated and measured to validate the theoretical deducing and the feasibility of method. © 2015 Trans Tech Publications, Switzerland.

关键词： Energy harvesting

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Orbital-Ordering Driven Simultaneous Tunability of Magnetism and Electric Polarization in Strained Monolayer VCl_(3)

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Chinese Physics Letters 2024年第4期41卷 126-131页

作者：郭的坪王聪王侣锦陆赟豪吴骅张妍宁季威 Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Zhejiang Province Key Laboratory of Quantum Technology and Device State Key Laboratory of Silicon MaterialsDepartment of PhysicsZhejiang UniversityHangzhou 310027China Laboratory for Computational Physical Sciences(MOE) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Two-dimensional(2D)van der Waals magnetic materials have promising and versatile electronic and magnetic properties in the 2D limit,indicating a considerable potential to advance spintronic *** predictions thus far have not ascertained whether monolayer VCl_(3) is a ferromagnetic(FM)or anti-FM monolayer;this also remains to be experimentally *** theoretically investigate the influence of potential factors,including C_(3) symmetry breaking,orbital ordering,epitaxial strain,and charge doping,on the magnetic ground *** first-principles calculations,we predict a collinear type-Ⅲ FM ground state in monolayer VCl_(3) with a broken C_(3) symmetry,wherein only the former two of three t_(2g)orbitals(a_(1g),e_(g2)^(π)and e_(g1)^(π))are *** atomic layer thickness and bond angles of monolayer VCl_(3) undergo abrupt changes driven by an orbital ordering switch,resulting in concomitant structural and magnetic phase *** doping to the underlying Cl atoms of monolayer VCl_(3) without C_(3) symmetry simultaneously induces in-and out-of-plane *** can achieve a multiferroic phase transition if combined with the discovered adjustments of magnetic ground state and polarization magnitude under *** establishment of an orbital-ordering driven regulatory mechanism can facilitate deeper exploration and comprehension of magnetic properties of strongly correlated systems in monolayer VCl_(3).

关键词： monolayer symmetry orbital

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Analysis and Experiment of Encoding Errors for MOEMS micro Mirror Spectrometer

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Physics Procedia 2011年 19卷 285-290页

作者： MO Xiang-xia WEN Zhi-yu ZHANG Zhi-hai GUO Yuanjun National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing 400044 China The Key Laboratory for Opto-eletronic Technology and System under Ministry of Education Chongqing University Chongqing 400044 China

micro mirror arrays used in the novel spectrometer to achieve the modulation of Hadamard transformation (HT) and spectrum detection by a single detector can also be considered as a blazed grating. During the modulation, spectrum can not be completely reflected by micro mirror array s on the “on” state. While on the “off” state, there will be still light incidence into detector, since the way of light modulation by mirror arrays is diffraction rather than reflection. This will then cause encoding errors. To diminish these encoding errors, a blazed grating model for mirror arrays is proposed. In this paper, both encoding error and compensation are analyzed for the algorithm of HT. Firstly, establish a theoretic model of micro mirror arrays modulation, and calculate the light field distribution based on the Fraunhofer diffraction theory. Then use MathCAD software and Matlab software to simulate and correct the HT encoding errors. Finally, some experimental tests have been done on the micro mirror sp ectrometer system. The “on” state errors caused by micro mirror can be eliminated by dividing the background or rectifying the HT mask encoding. However, the “off” state errors can only be eliminated by constructing a comp ensation HT matrix. Both the “on” and “off” state errors are coexisted in the real situation. Exp eriment not only can reduce the encoding errors, but also increase signal-to-noise ratio.

关键词： micro mirror spectrometer encoding mirror Hadamard blazed grat ing

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Simulation research of biphasic silicon thin film solar cell of different crystalline volume fraction

Simulation research of biphasic silicon thin film solar cell...

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2010 International Conference on Optics, Photonics and Energy Engineering, OPEE 2010

作者： Yuan, Ning-Yi Wang, Shu-Bo Ding, Jian-Ning Wang, Xiu-Qin Ye, Feng Zhang, Jia-Li Chen, Hong-Min Center of Low-dimension Materials Micro/Nano Device and System Jiangsu Polytechnic University Changzhou 213164 China Key Laboratory of New Energy Source Changzhou 213164 China Center of Micro/Nano Science and Technology College of Mechanical Engineering Jiangsu University Zhenjiang 212013 China

ISBN: (纸本)9781424452354

Optical and electrical parameters of biphasic silicon with different crystalline volume fraction (fc) were estimated via effective medium approximation method and experimental results. Then software AMPS-ID has been performed to investigate the influence of fc on biphasic silicon as the intrinsic layer on the performance of biphasic silicon single-junction and amorphous silicon/biphasic silicon double-junction solar cells. According to the simulation results, biphasic silicon thin film with approximate 50 % fc is suitable to serve as the intrinsic layer of the thin film solar cells, which can achieve the highest conversion efficiency. © 2010 IEEE.

关键词： Thin film solar cells

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Brainmask:an ultrasoft and moist microelectrocorticography electrode for accurate positioning and long-lasting recordings

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microsystems & nanoengineering 2023年第5期9卷 295-307页

作者： Bowen Ji Fanqi Sun Jiecheng Guo Yuhao Zhou Xiaoli You Ye Fan Longchun Wang Mengfei Xu Wen Zeng Jingquan Liu Minghao Wang Huijing Hu Honglong Chang Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Collaborative Innovation Center of Northwestern Polytechnical University Shanghai 201108China Institute of Medical Research Northwestern Polytechnical UniversityXi’an 710072China College of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Department of Micro/Nano ElectronicsShanghai Jiao Tong UniversityShanghai 200240China

Bacterial cellulose(BC),a natural biomaterial synthesized by bacteria,has a unique structure of a cellulose nanofiberweaved three-dimensional reticulated *** films can be ultrasoft with sufficient mechanical strength,strong water absorption and moisture retention and have been widely used in facial *** films have the potential to be applied to implantable neural interfaces due to their conformality and moisture,which are two critical issues for traditional polymer or silicone *** this work,we propose a micro-electrocorticography(micro-ECoG)electrode named“Brainmask”,which comprises a BC film as the substrate and separated multichannel parylene-C microelectrodes bonded on the top *** can not only guarantee the precise position of microelectrode sites attached to any nonplanar epidural surface but also improve the long-lasting signal quality during acute implantation with an exposed cranial window for at least one hour,as well as the in vivo recording validated for one *** novel ultrasoft and moist device stands as a next-generation neural interface regardless of complex surface or time of duration.

关键词： recording electrode moisture

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