Open Access. Powered by Scholars. Published by Universities.®
- Keyword
Articles 1 - 5 of 5
Full-Text Articles in Engineering
Designing And Implementing A Micro-Controller Based Primary-Side Sensing Flyback Converter For Leds Driver, Nam Nhat Tran
Designing And Implementing A Micro-Controller Based Primary-Side Sensing Flyback Converter For Leds Driver, Nam Nhat Tran
Graduate Theses and Dissertations
The fast development of LED and its applications has enabled a new generation of lighting device with higher efficiency and long lifespan. By employing a primary-side sensing flyback converter and the PIC18F micro-controller series, an LED driver could achieve two important features: (1) the compatibility with the available lighting fixtures, and (2) reducing unit price. The flyback converter was chosen for its simplicity, competitive low cost, and its ability to provide a constant output current, a necessarily important factor to an LED driver. Meanwhile, the PIC18F micro-controller series offer numerous advanced features which include but not limited to pulse-width modulation …
Gesn Light-Emitting Devices, Yiyin Zhou
Gesn Light-Emitting Devices, Yiyin Zhou
Graduate Theses and Dissertations
Silicon based optoelectronic devices have been investigated for decades. However, due to the indirect band gap nature of Si and Ge, developing of efficient light-emitting source on Si is still a challenging topic. GeSn based optoelectronic devices have the great potential to overcome this deficiency for several reasons. By adding more fraction of Sn into Ge, GeSn band gap could be reduced. The narrowed band gap could be developed for near to mid infrared applications. The alloy can even become the direct band gap material with a large Sn composition (beyond 8%). This feature could enhance the light emission from …
Metal Assisted Nanowire Growth For Silicon Nanowire/Amorphous Silicon Composite Solar Cell, Asmaa Ali Sadoon
Metal Assisted Nanowire Growth For Silicon Nanowire/Amorphous Silicon Composite Solar Cell, Asmaa Ali Sadoon
Graduate Theses and Dissertations
Solar cells are photovoltaic devices that convert the energy of light to electricity by the photovoltaic effect. Crystalline silicon-based solar cells are the most dominant solar cells in the market today due to the high efficiency and relatively low cost. However, the cost of such solar cell is still high due to the large amount of material that is consumed in fabricating such a device. Polycrystalline/amorphous thin films and nanomaterial technologies have emerged to reduce the high cost of c-Si based solar cells and increase the efficiency. In this research, we combined these two technologies to propose and fabricate silicon …
The Role Of Quantum Dot Size On The Performance Of Intermediate Band Solar Cells, Najla Alnami
The Role Of Quantum Dot Size On The Performance Of Intermediate Band Solar Cells, Najla Alnami
Graduate Theses and Dissertations
The goal of this thesis is to understand possible mechanisms for the reported decrease of the open circuit voltage and solar cell efficiency in quantum dot (QD) intermediate band solar cells (IBSCs). More specifically, the effect of indium arsenide (InAs) QD height on the open circuit voltage and solar cell efficiency was studied in a systematic way. To explore this effect in QD solar cells, several solar cells (SCs) were grown with varying InAs QD heights. All experimental characteristics of the QD solar cells were compared to a reference structure without QDs. All samples were grown by Molecular Beam Epitaxy …
Characterization And Model Verification Of Sic Cmos Transmisison Gates, Andrew H. Taylor
Characterization And Model Verification Of Sic Cmos Transmisison Gates, Andrew H. Taylor
Electrical Engineering Undergraduate Honors Theses
The aim of this thesis is to present and explore the results of a method for characterizing CMOS transmission gates in an IC design process, as well as to describe their importance in circuit design. The method applies to any fabrication process, but the work for this thesis was conducted in a silicon-carbide process, in the first round of fabrication. The first section covers basic information regarding transmission gates, as well as showing their value in circuit design. Secondly, the design, simulation, and implementation of the characterizing test structures is detailed. The third section delineates the test setup and procedures …