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Articles 1 - 9 of 9
Full-Text Articles in Semiconductor and Optical Materials
Synthesis Of Selenium Nanostructures: Rods, Wires, And Fibers By Pulsed Laser Ablation In Liquids, Atikur Rahman
Synthesis Of Selenium Nanostructures: Rods, Wires, And Fibers By Pulsed Laser Ablation In Liquids, Atikur Rahman
Theses and Dissertations
Selenium is a semiconductor that has a bulk energy bandgap of 1.74 eV, is mainly used in sensors, rectifiers, and advanced photovoltaic solar cells. Selenium is very important for the energy applications and was declared as Energy Critical Element (ECE) by the American Physical Society (APS) and the Materials Research Society (MRS). The goal of this dissertation was to control the growth of selenium when being irradiated by a pulsed laser within a liquid environment. The method called “Pulsed Laser Ablation in Liquids” is a green synthesis technique that allows for ligand-free nanoparticles to be created. Laser repetition rates were …
Cuo/Cu Core/Shell Nanostructured Photoconductive Devices By Hwt And Hips, Khalidah Hussein Habeeb Al-Mayalee
Cuo/Cu Core/Shell Nanostructured Photoconductive Devices By Hwt And Hips, Khalidah Hussein Habeeb Al-Mayalee
Theses and Dissertations
Over recent years, great efforts are being dedicated to developing low cost and high-efficiency nanostructured design for optoelectronic applications. Nanostructured semiconductor materials have demonstrated superior performance as compared to bulk materials. Core/shell nanostructured geometries have received a great deal of attention not only in the area of synthesis and characterization but also in their potential applications. These structures have been used in abundance in various areas such as electronics, sensors, catalysis, biomedical, and optical devices. Well-controlled core/shell nanostructured geometries can offer a significant improvement in the devices' performance. Therefore, the fabrication of complex 3D core/shell architectures with controlled morphology, homogeneous …
The Fabrication And Characterization Of Cu(In,Ga)Se2 Solar Cell, Yasir Al-Rikabi
The Fabrication And Characterization Of Cu(In,Ga)Se2 Solar Cell, Yasir Al-Rikabi
Theses and Dissertations
The extremely large energy consumption rate on Earth today is likely to exhaust the conventional energy resources such as fossil fuels and coal in the near future. The need for new renewable energy sources becomes inevitable and urgent. Among various new energy resources, solar energy is the most promising one because it is abundant and environmentally clean. The Sun light can be converted into electricity by using solar cell devices. Even though the solar cell panels made of thin films are in competition with conventional single crystal solar cells, only four thin film solar cells, i.e. amorphous silicon (a- Si), …
High Performance Glad Nanorod Cuinxga(1-X)Se2 Arrays With Enhanced Carrier Collection And Light Trapping For Photodetector Applications, Matthew P. Brozak
High Performance Glad Nanorod Cuinxga(1-X)Se2 Arrays With Enhanced Carrier Collection And Light Trapping For Photodetector Applications, Matthew P. Brozak
Theses and Dissertations
Nanostructured arrays have become an appealing alternative to their thin film and bulk counterparts in photovoltaic and photoconductivity applications. Thin films have recently continued the evolution of efficiency and material sciences after taking over from traditional, doped silicon devices. Inside of the thin film revolution, CuInxGa(1-x)Se2 (CIGS) has emerged as a high efficiency p-type semiconductor with a wide band gap that is tunable based on the Indium to Gallium ratio and often deposited via expensive, high temperature deposition methods. While each of the aforementioned methods of construction have their disadvantages, the advantages of each can be combined to potentially increase …
Cu2znsn(S1-Xsex)4 Solar Cell Fabrication And Characterization, Weiwei Sun
Cu2znsn(S1-Xsex)4 Solar Cell Fabrication And Characterization, Weiwei Sun
Theses and Dissertations
Cu2ZnSn(S1-xSex)4 (CZTSSe) is a kesterite material with similar properties to CuInxGa1-xS2 (CIGS) but less expensive element contained. A significant progress has been made in terms of CZTSSe in solar cell applications. Despite its energy conversion efficiency of 12.6% has been achieved by IBM using solution processes, further research and understanding of the materials is still needed in order to improve the solar cell performance of CZTSSe. In this study, we use a facile chemical route to fabricating CZTSSe thin-film solar cells by spin-coating followed by selenization process. An environmentally friendly non-toxic solution of highly soluble, inexpensive, and commercially available precursors …
Effect Of Plasma Dynamics On Gallium Nitride Nanorod And Growth By Molecular Beam Epitaxy, Dever Paul Norman
Effect Of Plasma Dynamics On Gallium Nitride Nanorod And Growth By Molecular Beam Epitaxy, Dever Paul Norman
Theses and Dissertations
GaN is a wide bandgap semiconductor known for its use in high-frequency switching electronics and laser diodes, its stability as a high-temperature transistor material, and a radiation resistance which makes it an ideal material for space applications. Additionally, the discovery of the bandgap tunability of nitride materials using GaN has led to successful development of adjustable wavelength LED devices. However, the success of devices far outpaces the understanding of their material growth, making advances difficult to build upon. Plasma- Assisted Molecular Beam Epitaxy (PA-MBE) is an ideal growth method for achieving very precise structures for detailed study. Although plasma itself …
Investigation Of Polyaniline And Its Composites As Interlayers In Organic Solar Cells, Omar Abdulrazzaq Al-Azzawi
Investigation Of Polyaniline And Its Composites As Interlayers In Organic Solar Cells, Omar Abdulrazzaq Al-Azzawi
Theses and Dissertations
Significant attention has been given during the last few years to overcoming technological and material barriers to the development of organic photovoltaic devices (OPVs) with cost efficiency comparable to that of inorganic photovoltaics (PVs). If OPVs are to become commercially viable, major improvements are necessary. In this work, polyaniline (PANI) protonated with various levels of camphorsulfonic acid (CSA) and dissolved in m-cresol has been used as a hole-transport layer (HTL) in organic bulk-heterojunction solar cells. Polyaniline was first synthesized using oxidative polymerization based on the MacDiarmid method. The polymerization parameters, such as polymerization temperature and polymerization pH control agent, were …
Solution Processed Cu(In,Ga)S2 Thin Film And Nanowire Photovoltaics, Johnthan Armstrong
Solution Processed Cu(In,Ga)S2 Thin Film And Nanowire Photovoltaics, Johnthan Armstrong
Theses and Dissertations
Solar energy conversion is a highly attractive process for clean and renewable power for the future. Cu(In,Ga)(Se,S)2/CdS/ZnO has proven itself to be a worthwhile photovoltaic combination achieving record efficiencies upwards of 20%. These record efficiencies have been obtained through vacuum-based approaches. However, the high cost of vacuum-based fabrication processes become a barrier to affordable solar cells as an energy source. As a result, solution-based approaches have become the focus of many studies which have achieved record efficiencies of 15%. These solution-based approaches have not matched up with the vacuum-based approaches. In this work, we investigate methods to improve the solution-based …
Study Of Novel Materials For Organic Photovoltaics And Organic/Inorganic Hybrid Solar Cells, Viney Saini
Study Of Novel Materials For Organic Photovoltaics And Organic/Inorganic Hybrid Solar Cells, Viney Saini
Theses and Dissertations
As the human race evolves and continues to progress in the future, we will face some obstacles during the advancement. Challenges like water, food, and poverty crisis, pollution, population explosion, and diseases are impediments in the development of mankind. Above all, with the development arises the need to fulfill the energy requirements. There are number of technologies available to answer the present energy needs, e.g. coal, nuclear, oil/natural gas, hydropower, etc. All these technologies have their advantages and disadvantages, with disadvantages being greenhouse gas emissions and other environmental impacts. One technology which has lagged behind due to high cost is …