A Review on Cell Structure Optimization of IGBT Under Overload Condition

To review the research progress of design of bone scaffolds with different single cell structures. The related literature on the study of bone scaffolds with different single cell structures at home and abroad in recent years was extensively reviewed, and the research progress was summarized. The single cell structure of bone scaffold can be divided into regular cell structure, irregular cell structure, cell structure designed based on topology optimization theory, and cell structure designed based on triply periodic minimal surface. Different single cell structures have different structural morphology and geometric characteristics, and the selection of single cell structure directly determines the mechanical properties and biological properties of bone scaffold. It is very important to choose a reasonable cell structure for bone scaffold to replace the original bone tissue. Bone scaffolds have been widely studied, but there are many kinds of bone scaffolds at present, and the optimization of single cell structure should be considered comprehensively, which is helpful to develop bone scaffolds with excellent performance and provide effective support for bone tissue.

Next-generation ultrahigh power density proton exchange membrane fuel cells rely not only on high-performance membrane electrode assembly (MEA) but also on an optimal cell structure. To this end, this work comprehensively investigates the cell performance under various structures, and it is revealed that there is unexploited performance improvement in structure design because its positive effect enhancing gas supply is often inhibited by worse proton/electron conduction. Utilizing fine channel/rib or the porous flow field is feasible to eliminate the gas diffusion layer (GDL) and hence increase the power density significantly due to the decrease of cell thickness and gas/electron transfer resistances. The cell structure combining fine channel/rib, GDL elimination and double-cell structure is believed to increase the power density from 4.4 to 6.52kW L-1 with the existing MEA, showing nearly equal importance with the new MEA development in achieving the target of 9.0kW L-1 .

We report on the optimization of interface structure in ZnSnP2 solar cells. The effects of back electrode materials and related interface on photovoltaic performance were investigated. It was clarified that a conventional structure Mo/ZnSnP2 showed a Schottky-behavior, while an ohmic-behavior was observed in the Cu/ZnSnP2 structure annealed at 300 °C. STEM-EDX analysis suggested that Cu-Sn-P ternary compound was formed at the interface. This compound is considered to play an important role to obtain the ohmic contact between ZnSnP2 and Cu. In addition, it was clarified that the aqua regia etching of ZnSnP2 bulk crystals before chemical bath deposition process for the preparation of buffer layer was effective to remove the layer including lattice defects introduced by mechanical-polishing, which was supported by TEM observations and photoluminescence measurements. This means that the carrier transport across the interface was improved because of the reduced defect at the interface. Consequently, the conversion efficiency of approximately 2% was achieved with the structure of Al/ZnO;Al/ZnO/CdS/ZnSnP2/Cu, where the values of short circuit current density, JSC, open circuit voltage, VOC, and fill factor, FF, were 8.2 mA cm-2, 0.452 V, and 0.533, respectively. However, the value of VOC was largely low considering the bandgap value of ZnSnP2. To improve the conversion efficiency, the optimization of buffer layer material is considered to be essential in the viewpoint of band alignment.

Investigations on the effect of buffer layer on CMTS based thin film solar cell using SCAPS 1-D

This study investigates the modeling and optimization of a single solar cell structure, utilizing the inorganic double perovskite Cs₂AuBiCl₆. This material features an A₂BB'X₆ composition and possesses a bandgap energy of 1.12 eV. The fundamental structure of the solar cell has been described, and the physical parameters of its primary layers have been outlined. A simulation model was developed to calculate the current-voltage characteristics and photovoltaic parameters, taking into account recombination rates due to defects within the absorber and at the interfaces with the electron transport layer (ETL) and hole transport layer (HTL). The influence of various parameters was analyzed, including bulk and interface density of defects, layer thicknesses, back contact work function and operating temperature. Additionally, the performance of structures with alternative transport materials for the ETL and HTL layers was evaluated. The impact of energy bandgap offsets with the absorbing perovskite layer was considered to identify materials that enhance the collection of photogenerated carriers and ultimately improve efficiency. The simulations revealed an optimized structure that demonstrated enhanced performance compared to the initial design. The optimized solar cell achieved a yield of 18.4 %, representing an increase of 5.4 % over the basic structure, with key performance metrics including, short-circuit current density Jsc = 36.75 mA/cm², fill factor FF = 76.76 %, open-circuit voltage Voc = 0.5879 V. Given its narrow bandgap value, the optimized structure was further examined in a tandem cell configuration, showcasing its potential for high-efficiency devices with a yield reaching 33 %. This work significantly contributes to the development of efficient, stable, and non-toxic perovskite solar cells for photovoltaic applications, paving the way for advancements in sustainable energy technologies.

The optical constants of many metals commonly used in solar cells, e.g. as contacts or for light trapping structures, are not documented consistently in the literature, with different sources giving different values. In the case of metallic structures designed to improve absorption in a solar cell junction, the use of data from different sources can give strongly varying results for the effectiveness of nanophotonic light-trapping structures. The trade-off between diffraction into more oblique orders in the junction, enhancing absorption in the photovoltaic material, and the number of photons absorbed parasitically in the metal means small differences in the optical constants can lead to different very conclusions about the EQE and $J_{SC}$. This work documents the different optical constants for silver, aluminium, gold and titanium from several sources, the effect this has on plasmon quality factors, and quantifies the effect on modelling outcomes by considering the optimization of a test structure using a grid of metal nanodisks on the front surface of a thinned-down GaAs cell. Finally, we consider the effect for a structure previously predicted to give a very high $J_{SC}$ for a solar cell with an ultra-thin GaAs layer.

The band structure characteristics of a copper indium gallium sulfur selenide (Cu(In1–xGax)SeS, CIGS) solar cell incorporating a cadmium-free zinc sulfide (ZnS) buffer layer were investigated using technology computer-aided design simulations. Considering the optical/electrical properties that depend on the Ga content, we numerically demonstrated that the front gradient bandgap enhanced the electron movement over the band-offset of the ZnS interface barrier, and the back gradient bandgap generated a back side field, improving electron transport in the CIGS layer; in addition, the short circuit current density (JSC) and open circuit voltage (VOC) improved. The simulation demonstrated that the conversion efficiency of a double graded bandgap cell is higher than with uniform or normal/reverse gradient cells, and VOC strongly correlated with the average bandgap in the space charge region (SCR) of CIGS. After selecting VOC from the SCR, we optimized the band structure of the CIGS cell with a Cd-free ZnS buffer by evaluating JSC and the fill factor. We demonstrated that the cell efficiency of the fabricated cell was more than 15%, which agrees well with the simulated results. Our numerical method can be used to design high-conversion efficiency CIGS cells with a gradient band structure and Cd-free buffer layer.

The combination of a fractal formalism with linear methods of image analysis is the basis of a statistically reliable description of the morphology and classification of forms that are irregular from the point of view of Euclidean geometry, such as in vitro flattened amoeboid cells. We have developed a classification algorithm that is based on the morphological characteristics of immune cells of four species of marine invertebrates: the bivalves Spisula sachalinensis (Schrenck, 1862) and Callista brevisiphonata (Carpenter, 1864) and the echinoderms Aphelasterias japonica (Bell, 1881) and Asterias amurensis (Lutken, 1871). The morphological signs of the cells included dimensional characteristics (area and perimeter), features of the circle and the convex hull that circumscribes the cell, characteristics of the symmetry and roundness of the cell, as well as fractal dimension and lacunarity, which were determined in several ways while assessing the spatial complexity of cells. It was shown that the optimal classification structure of immune cells of all studied species is based on a similar universal algorithm, including hierarchical classification by the Ward method, using variables with the highest multimodality index that load different factors in the factor analysis.

From edge devices to cloud servers, providing optimized hardware acceleration for specific applications has become a key approach to improve the efficiency of computer systems. Traditionally, many systems employ commercial field-programmable gate arrays (FPGAs) to implement dedicated hardware accelerator as the CPU's co-processor. However, commercial FPGAs are designed in generic architectures and are provided in the form of discrete chips, which makes it difficult to meet increasingly diversified market needs, such as balancing reconfigurable hardware resources for a specific application, or to be integrated into a customer's system-on-a-chip (SoC) in the form of embedded FPGA (eFPGA). In this paper, we propose an eFPGA generation suite with customizable architecture and integrated development environment (IDE), which covers the entire eFPGA design generation, testing, and utilization stages. For the eFPGA design generation, our intellectual property (IP) generation flow can explore the optimal logic cell, routing, and array structures for given target applications. For the testability, we employ a previously proposed shipping test method that is 100% accurate at detecting all stuck-at faults in the entire FPGA-IP. In addition, we propose a user-friendly and customizable Web-based IDE framework for the generated eFPGA based on the NODE-RED development framework. In the case study, we show an eFPGA architecture exploration example for a differential privacy encryption application using the proposed suite. Then we show the implementation and evaluation of the eFPGA prototype with a 55nm test element group chip design.

In this paper the absorber layer of Tin mono-sulfide(SnS) thin film had been explored as an absorber layer of solar cell using the one dimensional simulator AMPS-1D.(Analysis of Microelectronic and Photonic Structures). The studies conducted by emphasize given to the SnS absorber layer thickness effect of the operating temperature and sun intensity with cell structure “ITO/ZnO/CdS/SnS/Ag”. The thickness of SnS thin film has been changed from 1000nm to 2000nm. The best efficiency of 13.2% is obtained at the highest thickness 2000nm at operating temperature is 3500C under 1sun. The study highlights the effect of thickness on the SnS absorber layer thin film solar cell.

Shape and Topology Optimization of Cell Structure

This study explored the performances of CZTS-based thin-film solar cell with three novel buffer layer materials ZnS, CdS, and CdZnS, as well as with variation in thickness of buffer and absorber-layer, doping concentrations of absorber-layer material and operating temperature. Our aims focused to identify the most optimal thin-film solar cell structure that offers high efficiency and lower toxicity which are desirable for sustainable and eco-friendly energy sources globally. SCAPS-1D, widely used software for modeling and simulating solar cells, has been used and solar cell fundamental performance parameters such as open-circuited voltage (), short-circuited current density (), fill-factor() and efficiency() have been optimized in this study. Based on our simulation results, it was found that CZTS solar cell with Cd0.4Zn0.6S as buffer-layer offers the most optimal combination of high efficiency and lower toxicity in comparison to other structure investigated in our study. Although the efficiency of Cd0.4Zn0.6S, ZnS and CdS are comparable, Cd0.4Zn0.6S is preferable to use as buffer-layer for its non-toxic property. In addition, evaluation of performance as a function of buffer-layer thickness for Cd0.4Zn0.6S, ZnS and CdS showed that optimum buffer-layer thickness for Cd0.4Zn0.6S was in the range from 50 to 150nm while ZnS offered only 50 – 75 nm. Furthermore, the temperature dependence performance parameters evaluation revealed that it is better to operate solar cell at temperature 290K for stable operation with optimum performances. This study would provide valuable insights into design and optimization of nanotechnology-based solar energy technology for minimizing global energy crisis and developing eco-friendly energy sources sustainable and simultaneously.

This study explores the potential of the vacancy-ordered perovskite material Cs2PtI6, which is inorganic and lead-free, as an absorber layer in a single-junction solar cell. The research is based on modeling, simulation, and subsequent optimization of the cell structure to achieve optimal conversion efficiency. A baseline structure FTO/TiO2/Cs2PtI6/Spiro-OMeTAD/Au was designed as the starting point for simulations. The effects of various physical factors on key photovoltaic parameters were evaluated, including the thicknesses of the absorber, electron transport layer (ETL), and hole transport layer (HTL), as well as the defect density within the Cs2PtI6 material and at its interfaces with the ETL and HTL. For this purpose, a mathematical model was established to investigate the combined effects of parameters, supported by contour plot analysis. Moreover, alternative materials for the ETL and HTL, featuring different physical properties and band alignments compared to those in the baseline structure, were investigated. The study also examined how the height of the energy barrier at the rear interface between the HTL and the metal layer influences device performance. Based on these findings, an optimized structure FTO/CeO2/Cs2PtI6/Cu2O/Carbon was developed. This configuration achieved a conversion efficiency of 18.54%, demonstrating its superiority over the baseline design and other comparable solar cell architectures. Overall, this work highlights the promising potential of vacancy-ordered Cs2PtI6 perovskite and contributes to the advancement of next-generation solar cell technologies.

Deposition of earth-abundant p-type CuBr films with high hole conductivity and realization of p-CuBr/n-Si heterojunction solar cell

A novel lead-free perovskite solar cell structure with solid-state layers of glass/FTO/TiO $_{2} /$MASnBr $_{3} /$CuI/Au has been developed and optimized using SCAPS-1D simulation software. A lead-free perovskite material (CH <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> NH <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> SnBr <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> ) has been utilized as the absorber layer. The majority of the transport layers examined in this study are composed of inorganic materials in order to minimize expenses and enhance efficiency. For electron and hole transport layers, several materials are being studied. After extensive simulation, the electron transport layers (ETLs) and hole transport layers (HTLs) are selected. Following the optimization of the thickness of the ETLs, HTLs, and most importantly the absorber layer, the doping concentrations of the HTLs, ETLs, and absorber layers are also investigated. Investigations have also been done into the maximum permitted defect density in all the transport, and absorber layers. Short circuit current density (J <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sc</inf> ), open circuit voltage (V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">oc</inf> ), and fill factor (FF) for the optimized structure are 32.7409 mA/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , 1.15514 V, and 89.27%, respectively with a power conversion efficiency (PCE) of 33.32%. A cost-effective, efficient, and stable perovskite PV cell structure is anticipated to be implemented in the future using the simulated results of the suggested configuration.