- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Conceptual Consequences of the SI
摘要： The SI and its forerunners were largely developed in response to the confusion of multiple electromagnetic unit systems at the start of the 20th century. More than 100 years later, the success of the SI is evidenced by its almost universal acceptance. The adoption of the ampere as the fourth base unit has proved to be a beneficial way of simplifying electromagnetic units. However, an unintended consequence of adopting this system has been the development of several misconceptions regarding the physics of electromagnetic quantities. The anticipated educational activities associated with the upcoming SI redefinition offer an ideal opportunity to resolve this concern.
关键词： CGS,Permeability of Free Space,SI,Ampere,Magnetic Constant,Electrical Units
更新于2025-09-23 15:22:29
-
The Effect of Adsorbent Layer Thickness and Gallium Concentration on the Efficiency of a Dual-Junction Copper Indium Gallium Diselenide Solar Cell
摘要： The split of the sunlight spectrum by the bandgap energy of multi-junction solar cells is a highly effective way to increase solar cell ef?ciency. The reason is that the energy of photons is effectively absorbed, and there is a reduction in solar cell loss. In this contribution, we report on the performance of a double-junction copper gallium diselenide/copper indium gallium diselenide (CGS/CIGS) solar cell with a cadmium sul?de (CdS) buffer layer simulator. The J–V characteristics and the external quantum ef?ciency were simulated under AM1.5 illumination. Increased ef?ciency was seen as a result of the change in the thickness of layers and different molar ratio amounts of gallium, and the optimal amount of each factor was obtained. In this study, a single CGS solar cell was used as the top cell and a single CIGS solar cell as the bottom cell in the tandem con?guration, which showed conversion ef?ciencies of 16.175% and 15.696%, respectively. Finally, solar cell ef?ciency of 32.3% was obtained in the double-junction state, an increase of 6% compared with the reference cell.
关键词： CGS/CIGS double-junction solar cells,Numerical simulation,ef?ciency,four-terminal solar cell
更新于2025-09-11 14:15:04
-
[IEEE 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Atlanta, GA, USA (2018.10.31-2018.11.2)] 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA) - Non-linear Input Capacitance Determination of WBG Power FETs using Gate Charge Measurements
摘要： This paper discusses the measurement of the input capacitances Cgs and Cgd of SiC and GaN power FETs in order to implement simulation models with an improved mapping of the drain-source voltage vds and drain current id during the switching operation. Based on the gate charge characteristic measured at an inductive load condition using different drain current values and temperature settings, the gate current is allocated to the charging of the gate-drain capacitance Cgd and the gate-source capacitance Cgs. With this approach the capacitance characteristics Cgs(vgs) and Cgd(vgd) are determined in the full operating range of the gate-source voltage vgs and gate-drain voltage vgd.
关键词： wide-bandgap semiconductors,Inter-electrode capacitances,dynamic measurements,cgs,capacitance-voltage characteristics,cgd
更新于2025-09-04 15:30:14