Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 130 for “"Power conversion efficiency"”.
-
Loss analysis of the power conversion efficiency of organic bulk heterojunction solar cells
… promising for this purpose. In this thesis the power conversion efficiency and lifetime of bulk heterojunction solar cells are analyzed. The electrical and optical losses are investigated for one representative material combination using two models for the bulk heterojunction solar cells. These …
-
Holographic Spectrum-Splitting Design for Micro-Concentrating Photovoltaic Applications
… when it provides high optical-to-electrical power conversion efficiency and energy yield at low cost. During the past few years the spectrum-splitting technology has been recognized as an important method to improve the overall power conversion efficiency and energy yield of solar …
-
Solution-processed doping in CdTe thin film solar cells
… a high absorption coefficient, the theoretical power conversion efficiency limit of 32% is limited by recombination and high resistivities in CdTe devices. Doping CdTe is a necessary way to improve device performance. In this work, it is demonstrated that a cost-effective solution-processed …
-
Optimization of PEDOT: PSS thin film for organic solar cell application
… several attempts have been conducted to improve power conversion efficiency by optimizing different thicknesses of the interlayer between active layer and metal. Power conversion efficiency, short circuit current, open circuit voltage and fill factor were measured on all produced devices. In …
-
Development Of Ionic Liquid Swelled Poly-Electrolyte Membranes For Use In Dye-Sensitized Solar Cells
… and ionic liquid alkyl chain length. High power conversion efficiencies achieved 1.60% for low molecular weight poly(DADMAI) swelled with 1-hexyl-3-methyl imidazolium iodide and after 45 days 41.0% of this initial power conversion efficiency was retained. This is a substantial improvement …
-
Efficiency Improvement of RF Energy Transfer by a Modified Voltage Multiplier RF DC Converter
… overbridged. The main challenge thereby is the power conversion efficiency from a low level RF input power to a Direct Current (DC) voltage which is able to supply the mobile system. For this purpose, a novel approach for RF DC conversion is proposed. It consists of a modified voltage multiplier …
-
Dual Spin-Cast Thermally Interdiffused Polymeric Photovoltaic Devices
… the thickness and the thermal treatments on the power conversion efficiency, short circuit current, open circuit voltage and other key electrical properties. Bilayer films of sequentially spin-cast donor and acceptor materials are exposed to various heat treatments in order to induce the …
-
Applications of nanoimprinted structures to organic photovoltaics
… have the potential to be a low-cost, flexible power conversion solution to many energy problems. These OPVs take advantage of an extremely thin active layer which enables this flexibility and reduces material volume. However, it is this thin quality that calls for improved power conversion …
-
Development of Iii-Nitride Non-Polar Leds and Self-Aligned Laser Structure
… issue is intimately tied to the overall system power conversion efficiency as it dictates the number of light emitting diodes needed to produce a certain light output power. The system power conversion efficiency itself is dictated by the LED internal quantum efficiency (IQE), the light …
-
Design and performance evaluation of lead-free inorganic perovskite solar cells for addressing Nigeria's energy crisis.
… reliance on crude oil and natural-gas-fired power plants, which are often unavailable, has led to frequent energy crises. Despite this, Nigeria possesses vast untapped Renewable Energy (RE) resources, particularly solar radiation, with potential varying from 3.393 to 6.669 kWh/m2/day across …
-
Development of low-temperature solution-processed colloidal quantum dot-based solar cells
… ligand exchange scheme, exhibits comparable power conversion efficiency (3.5%) to that of high-temperature (260°C) sintered or sputtered ZnO/PbS (PbSe) QD devices. The initial device yield issue associated with the pinhole formation was addressed, and a procedure for the fabrication of …
-
Enhancing the Photovoltaic Performance of P3HT/PDIB Silsesquioxane Donor-Acceptor System Using Spray Deposition Fabrication Technique
… of the processing the materials to improve photo conversion efficiency and also by modifying the active components of the organic materials. Recently, it has been recognized that the deposition techniques also plays a major role in enhancing the power conversion efficiencies. Currently, though the …
-
Ultra-thin III-V photovoltaic technology for space applications
… extraterrestrial applications. To achieve higher power conversion efficiency and resilience to space radiation, III-V semiconductor material-based PV technology is the leading choice for power generation in space applications. However, III-V solar cells are still limited by high material and …
-
Transparent Platinum Counter Electrode for Building Integrated Dye-sensitized Solar Cells
… DSSCs with Pt-NP counter electrode had 6.17% power conversion efficiency, comparable to the 6.46% efficiency of the corresponding reference opaque DSSC with sputtered Pt counter electrode.</p>
-
Charge recombination in organic small-molecule solar cells by Jiye Lee.
To enhance the power conversion efficiency in organic solar cells, charge recombination loss needs to be minimized. First, we perform transient absorption spectroscopy to study the charge recombination dynamics of thin film bulk heterojunction of the archetype organic solar cell molecules, copper …
-
Study of Moisture and Water Effects in Low Temperature Crystallization of Perovskite Film for Efficient Solar Cells
… and the corresponding solar cells have exhibited power conversion efficiency (PCE) of more than 20%. However, perovskite solar cells suffer from poor stability in presence of moisture and use of toxic element (Pb). Understanding the crystallization process and the effects of moisture and water is …
-
Near-Infrared High Efficiency Organic Dye Sensitized Solar Cells (DSCs) and Biological Fluorescent Imaging Dyes
… received intensive attention due to their high power conversion efficiency and low material cost. This dissertation describes efforts to design and synthesize near-infrared organic dyes to apply to two systems: first, for use in the improvement of DSCs by the optimization of electron rich …
-
High-Efficiency and High-Power Density DC-DC Power Conversion Using Wide Bandgap Devices for Modular Photovoltaic Applications
With the development of solar energy, power conversion systems responsible for energy delivering from photovoltaic (PV) modules to ac or dc grid attract wide attentions and have significantly increased installations worldwide. Modular power conversion system has the highest efficiency of maximum …
-
POLYMER ORGANIC SEMICONDUCTORS AND THEIR DEVICES
… were designed, synthesized, and achieved a power conversion efficiency of 1.2% in device applications, comparable to best values reported using similar material systems. Further, their impact on polymer blend film morphology was discussed.
-
Low Impurity Content GaN Prepared via OMVPE for Use in Power Electronic Devices: Connection Between Growth Rate, Ammonia Flow, and Impurity Incorporation
GaN has the potential to revolutionize the high power electronics industry, enabling high voltage applications and better power conversion efficiency due to its intrinsic material properties and newly available high purity bulk substrates. However, unintentional impurity incorporation needs to be …
Page 1 of 7