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.
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Showing 1 to 20 of 527 for “"Photovoltaics."”.
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Singlet fission photovoltaics
The efficiency of a solar cell is restricted by the "single junction limit," whereby photons with energy higher than the bandgap lose energy by thermalization. Singlet exciton fission splits a high-energy molecular excitation ("singlet" exciton) into a pair of lowenergy ones ("triplet" excitons). …
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Organic photovoltaics and concentrators
… several advantages in the design of organic photovoltaics and organic solar concentrators for the ultimate end goal of achieving a lower cost solar electric conversion. In this work, we explore two new device architectures. In antenna organic solar cells, we utilize external energy transfer …
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Atomic layer deposition of photovoltaics
In recent years organic-inorganic halide perovskites have gained significant interest due to their high power conversion efficiencies (PCEs). These high efficiencies can be attributed to the perovskites’ tuneable optical bandgap and long carrier diffusion length, with their low fabrication cost …
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Photovoltaics for a residential application
Includes bibliographical references (pages 68-72).
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Large-area lightweight organic photovoltaics
… of large-area ultra-lightweight organic photovoltaics, reinforcement of such large-area devices with lamination to light weight composite fabrics, and present solution-coating approaches of organic photovoltaics as a step towards realizing all-printed lightweight electronics. …
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Reducing recombination in organic photovoltaics
In this thesis, I consider two methods to improve organic photovoltaic efficiency: energy level cascades and promotion of triplet state excitons. The former relies on a thin layer of material placed between the active layers of a photovoltaic device to destabilize excitons. If the interfacial …
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Drivers of photovoltaics cost evolution
Photovoltaics (PV) have experienced notable development over the last forty years. PV module costs have declined 20% on average with every doubling of cumulative capacity, while global PV installations have increased at an average rate of 30% per year. However, costs must fall even further if PV is …
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Scalable Perovskite Thin-Film Photovoltaics
In recent years lead halide based thin-film perovskites have emerged as a promising direct bandgap semiconductor for light absorption and emission applications. This is in part due to their compositional tunability and potential alloying that allows their color to be tuned from the near-IR through …
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Semiconductor nanochemistry and hybrid polymer photovoltaics
The dissertation focuses on the synthesis, mechanism, and structural stability of semiconducting nanoparticles as well as on the development of new hybrid polymeric photovoltaic devices based on nanoparticle/polymer composites. A series of experiments was performed where highly monodisperse …
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Processes and Materials for Organic Photovoltaics
The field of organic photovoltaics is driven by the desire for better and cheaper solar cells. While showing much promise, current generations of organic photovoltaic (OPV) devices do not exhibit properties that are suited for wide scale commercialization. While much research has been dedicated …
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Voltage-Offset Resistive Control for Photovoltaics
This thesis introduces voltage-offset resistive control (VRC) for photovoltaic (PV) applications that exhibits low sensitivity to solar irradiance changes. Although there are numerous control schemes and maximum power point tracking (MPPT) methods for PVs, few focus on maintaining low sensitivity …
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The application of photovoltaics for buildings
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1999.
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Optical Antenna Photovoltaics & Making Metallic Nano-rods
Solar power is a clean, renewable source of energy. There is a growing demand for cheap, high efficiency photovoltaic cells. Of the many emerging solar harvesting technologies, a concept that has not been widely explored is that of optical antennas. In 1972 Bailey et al.[1] explored scaling down of …
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Biomimetic nanostructured surfaces for antireflection in photovoltaics
… and antiglare applications in addition to photovoltaics.
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Ultra-thin GaAs Photovoltaics for Space Applications
Ultra-thin photovoltaics (<100 nm) have shown an intrinsic tolerance to radiation-induced damage which makes them a potentially advantageous power source for spacecraft which need to withstand harsh environments outside Earth’s atmosphere. In the ultra-thin regime, high transmission losses can be …
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Photovoltaics for educational television in rural schools
One application for photovoltaic (PV) technology is in providing electricity for educational aids, in developing areas remote from grid supply. Technical, social and economic aspects of this option are investigated, in local context, by examining the use of small PV systems to power educational …
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Applications of nanoimprinted structures to organic photovoltaics
Small-molecule organic photovoltaic cells (OPVs) 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 …
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Solar energy conversion via photovoltaics and photocatalysis
… sectors. In this regard, we have studied organic photovoltaics and solar water splitting by using oCVD (Oxidative Chemical Vapor Deposition) polymers and doping-treated bismuth vanadate (BiVO 4), respectively. oCVD is a solvent-free conformal vacuum-based technique to enable thin-film fabrication …
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Photosynthesis-inspired device architectures for organic photovoltaics
Organic semiconductor photovoltaics offer a promising route to low-cost, scalable, emissions-free electricity generation. However, achieving higher power conversion efficiencies is critical before these devices can play a larger role in our future energy generation landscape. Organic photovoltaic …
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Photon management in thermal and solar photovoltaics
Photovoltaics is a technology that directly converts photon energy into electrical energy. Depending on the photon source, photovoltaic systems can be categorized into two groups: solar photovoltaics (PV) and thermophotovoltaics (TPV). In solar photovoltaic systems, the photon source is the sun, …
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