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 23 for “"Thermophotovoltaics"”.
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Thermophotovoltaics : shaping the flow of thermal radiation
This thesis explores the modeling, design, and optimization of photonic crystals as spectral control components for high-performance thermophotovoltaic (TPV) power conversion. In particular, we focus on the use of one-dimensional and two dimensional photonic crystals as optical filters and …
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Cavity absorber-emitters for high-temperature solar thermophotovoltaics
… examines one of these such technologies, solar thermophotovoltaics (STPV), and presents opportunities to improve on past work in the field to enable higher conversion efficiencies and lower cost solar power. STPV power systems typically utilize a monolithic absorber-emitter component that is …
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Design Challenges for Ultra-High-Temperature Energy Storage with Thermophotovoltaics
Decarbonization of the electricity grid is an important part of mitigating the extent and effects of human-caused climate change. Some of the most promising carbon-free and renewable energy resources, like wind and solar, have intermittent production that could be addressed, in part, with …
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A practical high temperature photonic crystal for high performance thermophotovoltaics
… practical selective emitter for high performance thermophotovoltaics (TPV) that offers high optical performance, high temperature stability, and the ability to be fabricated in large area samples. In a TPV system, a heat source brings the photonic crystal emitter to incandescence, and the …
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Characterization of Thermophotovoltaics and Materials for High-Temperature Thermal Energy Storage
… with fossil fuels. The TEGS concept uses thermophotovoltaics (TPVs) to convert stored heat back to electricity. TPVs have long had the potential to reach high efficiencies, but experimental demonstrations of devices have not met these predictions. Prior work has largely focused on ~0.5 – …
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Design, modeling, and optimization of indium arsenide diodes for microscale thermophotovoltaics
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2001.
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Solving Series Resistance Problems In GaSb Thermophotovoltaics with Graphene and Other Approaches
GaSb Thermophotovoltaics are a key technology in the search for the ability to power small scale autonomous systems. In this work, MBE grown GaSb photovoltaic devices are fabricated and tested under AM 1.5 conditions. These devices displayed short circuit current values as high as 40 mA/cm2 but …
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Validating surface evolution modeling on high temperature selective emitters : an investigation of the thermal stability of nano-scale surface structures for thermophotovoltaic systems
… systems. One such system involves the use of thermophotovoltaics (TPV), which convert thermal energy to electricity. Nano-patterned features can im prove electromagnetic emission from the TPV emitter, increasing system efficiency. These features, however, degrade at high temperatures over …
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Improving efficiency of ID thermopower wave devices and studying 2D reaction waves
… applications such as thermoelectricity and thermophotovoltaics. We calculated the improvement in efficiency of a modified thermophotovoltaics setup, when the input is a reaction wave, operating under superadiabatic conditions. Experimentally, we studied these self-propagating reaction waves …
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Analysis of materials properties of thin film structures for thermoelectric and thermophotovoltaic applications
… superlattices for materials studies related to thermophotovoltaics and thermoelectrics respectively. High resolution x-ray diffraction (HRXRD) was used to determine the As concentration in each of the InAsP layers. Arsenic concentration was found to vary linearly with the percentage of AsH3 in …
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Laboratory-Scale Thermal Energy Grid Storage (TEGS) Prototype
… pump molten tin as a heat transfer fluid and use thermophotovoltaics to convert the thermal energy back to electricity. While many of these individual components have been demonstrated in isolation, there has yet to be a system which combines all these technologies into a working prototype. The …
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Solar thermophotovoltaic efficiency potentials : surpassing photovoltaic device efficiencies
… contributes to electricity generation. Solar thermophotovoltaics (TPV) aim to improve the efficiency with which sunlight can be converted to electrical energy by converting solar energy to thermal energy first before generating electrical energy with a PV cell. Instead of direct illumination …
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Anomalous phenomena and spectral tailoring in photonic crystals
… 5, motivated by the problem of low efficiency in thermophotovoltaics, I look at selective emissivity of a 2D metallic photonic crystal. A semi-analytical theory is developed using only the material dispersion and geometrical parameters. Applications of the selective emitter, including power …
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Photon management in thermal and solar photovoltaics
… into two groups: solar photovoltaics (PV) and thermophotovoltaics (TPV). In solar photovoltaic systems, the photon source is the sun, whereas in thermophotovoltaic systems the photons are from artificially designed thermal emitters that operate at a lower temperature. The differences in the …
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DESIGN, FABRICATION AND CHARACTERIZATION OF EPITAXIAL AND NON-EPITAXIAL THERMO-PHOTOVOLTAIC CELLS
Thermophotovoltaics (TPVs) have significant potential in efficiently converting thermal energy to electrical energy. These applications include conversion from internal combustion engines, small nuclear sources and even portable fuel-based sources. Group-III antimonide semiconductors have been …
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Sulfur Implanted GaSb for Non-Epitaxial Photovoltaic Devices
… optoelectronic devices, particularly thermophotovoltaics (TPV). In order to make GaSb-based technologies like TPV more widely available, non-epitaxial dop- ing methods for GaSb must be pursued. Ion implantation is relatively unexplored for GaSb, and can offer advantages over the more …
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Photonic engineering of near- and far-field radiative heat transfer
… selective behavior is applied to a theoretical thermophotovoltaics (TPV) system where it is predicted the energy conversion efficiency can be improved. In contrast, thin-films of metals supporting surface plasmon polariton (SPP) modes will exhibit the opposite effect where the hybridization of …
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Refractory oxides based multilayered core@shell plasmonic nanostructures
… in high-temperature environment, such as solar thermophotovoltaics and the burgeoning studies of nanoscale thermodynamics that are fundamental to nanochemistry. <br/><br/>Despite the much research efforts of expanding plasmonic materials beyond the noble metals (gold, silver, copper, and …
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A Theoretical Study on the Effect of Curvature on Near-field Radiative Transfer
… nano-scale gaps finds applications in near-field thermophotovoltaics, heat assisted magnetic recording and near-field radiative cooling. While the dependence of near-field radiative transfer on the gap between two planar objects is well understood, the effect of curvature on near-field radiative …
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Thermophotovoltaische Konversion von Verbrennungswärme
In der vorliegenden Untersuchung werden Methoden für die Auslegung eines <br>Systems zur thermophotovoltaischen (TPV) Konversion von Verbrennungswärme <br>entwickelt und auf eine Anordnung mit vorgegebener Strahlertemperatur und <br>vorgegebenem Photovoltaik(PV)-Zellmaterial angewandt. <br> <br>Für …
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