- 标题
- 摘要
- 关键词
- 实验方案
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Two stage modelling of solar photovoltaic cells based on Sb2S3 absorber with three distinct buffer combinations
摘要： Solar cell research has always been an attraction by virtue of its clean and green status. However, to overcome the implications of high cost and moderate efficiency, there has always been fierce competition to search alternative approach for designing efficient solar cells with optimal performance-cost ratio. Recently, antimony sulfide (Sb2S3) has received substantial attention as an absorber in thin film solar cells due to earth abundance, low cost, non-toxic property and high optical absorption. Still, its performance could not match Si based cells. In this work, we adopted two-stage simulation approach to design Sb2S3 absorber based heterojunction solar cell to enhance efficiency. Initial simulation for configuration optimization was done considering thickness, defect density, recombination (radiative, Auger) effect, carrier density of the Sb2S3 absorber layer. Buffer layer thickness and absorption coefficient optimization was taken up. Further, series and shunt resistance of the device as well as conduction band offset (CBO) at absorber/buffer interface was also optimized at initial stage only. In the next level of simulation, efficiency enhancement was achieved by optimizing optimal back contact metal work function, absorber layer band gap grading and temperature. The aforesaid two-stage optimization yielded efficiency ~24.81%, which is higher than conventional thin film solar cell. The optimal solar cell structure configuration, for Sb2S3 absorber solar cell, suggested a positive CBO of 0.26 eV (e.g.; ZnS buffer layer), a back contact metal work function of 5.1 eV (e.g.; Mo, Au) and band gap grading window ~1.31 to 1.62 eV.
关键词： Conduction band offset,Sb2S3 solar cell,Work function,Band gap grading,Simulation
更新于2025-09-23 15:21:01
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Effective many-body Hamiltonians of qubit-photon bound states
摘要： Quantum emitters (QEs) coupled to structured baths can localize multiple photons around them and form qubit-photon bound states. In the Markovian or weak coupling regime, the interaction of QEs through these single-photon bound states is known to lead to effective many-body QE Hamiltonians with tuneable but yet perturbative interactions. In this work we study the emergence of such models in the non-Markovian or strong coupling regime in different excitation subspaces. The effective models for the non-Markovian regime with up to three excitations are characterized using analytical methods, uncovering the existence of doublons or triplon states. Furthermore, we provide numerical results for systems with multiple excitations and demonstrate the emergence of polariton models with optically tuneable interactions, whose many-body ground state exhibits a super?uid-Mott insulator transition.
关键词： long-range interactions,quantum simulation,quantum optics
更新于2025-09-23 15:21:01
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Self-organizing Behavior of Y-junctions of Graphene Nanoribbons
摘要： With the help of our molecular dynamics simulation we want to motivate emerging and development of technological methods for building of carbon nanostructure networks. We shall study self-organizing behaviors of graphene nanoribbons in Y-junctions. We determine the conditions for perfect formation of nanotube Y-junctions from parallel nanoribbons. The role of graphene nanolithography in nanoribbon network and nanotube network production is studied. Our simulations show the possibility of nanotube network realization as well.
关键词： molecular dynamics,nanotube,graphene,network,nanoribbon,simulation
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA, USA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - A Hexagonal Grid Based Human Blockage Model for the 5G Low Terahertz Band Communications
摘要： Users continuously demand higher connection speeds and data traffic from wireless communication networks. The newly required network capacity should be provided by higher frequency bands, because legacy sub-6 GHz bands are already operating using advanced communication techniques that provide very high spectral efficiencies. Consequently, millimeter wave communication standards are either complete or ongoing, and general submillimeter wave applications are next in line. Accordingly, this paper proposes a motion model in hexagonal grid of a person carrying a user equipment. Electromagnetic wave blockage analyses by utilizing channel characteristics of the low-THz band are presented. Lastly, the communication and blockage probabilities of an exemplary system are both theoretically examined and numerically simulated.
关键词： Markov processes,submillimeter wave propagation,numerical simulation,mathematical model,submillimeter wave communication,5G mobile communication
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Singapore (2018.7.16-2018.7.19)] 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Electrical Characterization of FEOL Bridge Defects in Advanced Nanoscale Devices Using TCAD Simulations
摘要： In this work, we present the electrical characterization of various Front-End-Of-Line (FEOL) bridge defects location using Technology Computer Aided Design (TCAD) based simulation. The electrical characteristics obtained from simulation is useful in identifying the possible locations of the bridge defects. The simulation result correlates well with nano-probing result collected on actual failing devices. Furthermore, simulation of potential defects provides a quick way of understanding how the defect may influence the electrical behavior of transistors.
关键词： Defect Simulation,TCAD,FinFET
更新于2025-09-23 15:21:01
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[IEEE SoutheastCon 2018 - St. Petersburg, FL (2018.4.19-2018.4.22)] SoutheastCon 2018 - An Examination of Dichotomous and Centroid Tracking of a Monopulse Angle Tracking Unit
摘要： The engineering community is confident in its assessment of how an angle tracker will perform in a multi-target environment as the target-to-tracker range decreases, causing targets to leave the tracker antenna beam. When one target signal dominates due to the angular separation of the targets, the tracker will center on the dominating signal. It is not well understood how the tracker will behave when angle separation is not the limiting factor in signal strength. That topic is addressed in this paper. Specifically, we show how angle error signal normalization impacts track loop dynamics in a dual target scenario. If the error signal is normalized by an Automatic Gain Control (AGC), the behavior will depend upon the Doppler frequency separation of the two targets relative to the AGC bandwidth. The problem is addressed from a theoretical perspective, and via simulation. The theoretical and simulation results agree well.
关键词： simulation,AGC,angle tracker,Automatic Gain Control,Doppler frequency,monopulse
更新于2025-09-23 15:21:01
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SET Sensitivity of Tri-Gate Silicon Nanowire Field-Effect Transistors
摘要： The SET response of SOI tri-gate silicon nanowires is investigated using direct measurements of current transients. Resulting collected charge distributions are compared to simulations in two steps: Monte-Carlo simulations of deposited energy and TCAD simulation of collected charge, using detailed description of charge generation. Good agreement with experimental data is obtained. Current simulation tools can thus be used, with minor optimization, to simulate such integrated devices. The analysis of SETs show collected charge values lower than both the charge estimated from the LET and the charge actually generated in the nanowire, revealing a limited sensitivity of nanowire devices to high LET ions.
关键词： Nanowire,SEE,Single-Event Transient,Ultra-Thin SOI,Particle-matter interaction,Single-Event Effect,Geant4,FinFET,TCAD,Multiple-gate,Simulation,SET,Experiments
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu, China (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - An EM-Based Cascade Design Procedure for High-Order Bandpass Filter
摘要： In this paper, a cascade design procedure exploiting segmented approach and the space mapping technique is proposed for efficient EM-based design optimization of high order microwave bandpass filters. The theory of the proposed method is discussed in detail. The optimization routine is presented. A ten pole hairpin microstrip filter is optimized efficiently using Keysight ADS and Sonnet EM simulator to validate the proposed method.
关键词： electromagnetic simulation,space mapping,optimization,CAD,microstrip filter,Bandpass filter
更新于2025-09-23 15:21:01
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Simulation research on wafer warpage and internal stress in the First Passivation process of eSiFO package
摘要： In the electronics packaging process, warpage and thermal stress are two important causes which lead to packaging failure. In this paper, ABAQUS is used to perform three-dimensional numerical simulation of eSiFo packaging products from the thermodynamic point of view. The effects of different structural parameters on wafer warpage and thermal stress in electronic packages are simulated. In the simulation part, single factor analysis, Taguchi orthogonal experiment design and finite element analysis are combined to obtain the optimized process parameters and perform simulation analysis. The result shows that the structural parameter that has the greatest influence on the von Mises stress value of the wafer is the window size. And the structural parameter that has the greatest influence on the wafer warpage is the Die thickness. The thickness of the adhesive layer and the thickness of the passivation layer have a relatively small effect on the von Mises stress and the warpage value of the wafer. Under the optimized process parameters, the maximum von Mises stress and the maximum warpage value are much smaller than the initial process.
关键词： Taguchi orthogonal experiment,optimization of process parameters,numerical simulation,Warpage,thermal stress
更新于2025-09-23 15:21:01
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - A New SAR Image Simulation Method for Sea-Ship Scene
摘要： Due to the difficulty of sea scene synthetic aperture radar (SAR) trial, SAR image simulation for sea-ship scene is vitally important for the research of sea remote sensing and surveillance. In this paper, a new SAR image simulation method for sea-ship scene is proposed. Firstly, the geometrical models of sea surface and ship target are obtained through sea spectrum and CAD modeling technology respectively. Then the SAR image intensity data of sea surface is calculated by small perturbation method (SPM) and velocity bunching (VB) theory, meanwhile the radar cross section (RCS) data of ship target is computed through physical optics (PO) method. Finally, the SAR image of sea-ship scene is generated by SAR imaging method after transforming image intensity data and RCS data to the same spectrum domain. The simulation result has verified the effectiveness of the proposed method.
关键词： SPM method,sea-ship scene,CAD,PO method,VB theory,simulation of SAR image
更新于2025-09-23 15:21:01