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 18 of 18 for “"Multijunction"”.
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Germanium-on-silicon virtual substrate for lateral multijunction photovoltaics
Lateral multijunction photovoltaics based on III-V direct band gap semiconductors enable efficient energy conversion. However, lattice matching between cell and substrate requires the use of expensive Ge or III-V substrates, which limits widespread application of III-V solar cells. Cost reduction …
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Design of III-V Multijunction Solar Cells on Silicon Substrate
… researchers. III-V compound semiconductor based multijunction solar cells have been the dominant choice for space power due to their superior performance compared to any other existing solar cell technologies. In spite of unmatched performance of III-V solar cells, Si cells have dominated the …
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Heuristic modelling of multijunction solar cells using a parallel genetic algorithm
In order to fabricate solar cells with the highest possible values of efficiencies, material type, layer thickness and doping have to be properly selected. It can be achieved if light absorption and carrier generation are maximized and losses minimized. The same parameters that increase carrier …
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Modeling of Bragg reflectors to increase performance of high efficiency III-V multijunction solar cells
High efficiency III-V solar cells are important for solar concentrator systems and space applications. To increase the efficiency of these cells, creative methods have been employed such as adding quantum wells in stress-balanced superlatticies to get closer to the ideal bandgaps for three junction …
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Silicon bottom subcell fabrication, loss analysis and shunt identification for two-terminal multijunction solar cells
Two-terminal multijunction solar cells are a promising technology to surpass the energy-conversion efficiency of commercial single junction devices. Multijunction solar cells that integrate silicon bottom subcells could allow cost-effective efficiency enhancements and further growth in the …
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Heterogeneous Integration of III-V Multijunction Solar Cells on Si Substrate: Cell Design and Modeling, Epitaxial Growth and Fabrication
… Integration of such high-efficiency III-V multijunction solar cells on significantly cheaper and large area Si substrate has the potential to address the future LCOE roadmaps by unifying the high-efficiency merits of III-V materials with low-cost and abundance of Si. However, the 4% lattice …
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Selective epitaxial growth techniques to integrate high-quality germanium on silicon
… and virtual substrates for integrating III-V multijunction solar cells. However, growing epitaxial Ge on Si poses many engineering challenges, ranging from lattice mismatch, to thermal expansion coefficient mismatch, to non-planar morphological evolution. The lattice mismatch between Ge and Si …
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Elucidating efficiency losses in cuprous oxide (Cu₂O) photovoltaics and identifying strategies for efficiency improvement
… novel device structures, and the possibility of multijunction cells.
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Nanostructural engineering of vapor-processed organic photovoltaics for efficient solar energy conversion from any Surface
… via conventional methods: (1) optimization of multijunction efficiency via computational optical interference modeling and subcell photocurrent balance quantization and control, and (2) novel implementation of conventional vapor processing methods in the formation of molecular semiconductor …
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High Deviatoric Strain Engineering/
… and we predict the formation of gold-silver multijunction nanowire arrays through deviatoric-stress driven sintering of nanoparticles. We also simulate the plastic flow of two dimensional amorphous granular pillars subjected to athermal, uniaxial and quasistatic deformation. We find that for …
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Materials and design strategies for solar microcells
… the aspheric lens can be incorporated into a multijunction spectrum splitting solar cell design. Experimental performances for InGaP and GaAs solar cells in a model spectrum splitting device are examined. Finally, a discussion of future directions of photovoltaic research – particularly with …
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Aspects of Photovoltaic Systems: Study and Simulation of Silicon Phthalocyanine Bulk Heterojunction Solar Cells and Monochromatic Photonic Power Converters
… to a solar cell with a narrow bandwidth. Multijunction designs are often used for increased operating voltage and efficiency. In such designs employing a vertical architecture, the bottom-most junction has the largest thickness along with the lowest efficiency due to increased …
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Heteroepitaxial Germanium-on-Silicon Thin-Films for Electronic and Photovoltaic Applications
… Integration of such high-efficiency III-V multijunction solar cells on significantly cheaper and large area Si substrate has the potential to address the future LCOE roadmaps by unifying the high-efficiency merits of III-V materials with low-cost and abundance of Si. However, the 4% lattice …
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Concentrador fotovoltaico para iluminación por fibra óptica de células multiunión
… of the performance and durability of III-V multijunction cells, whose efficiency figures double those of silicon cells although they must be fully tested under atmospheric conditions, would be possible. Concerning this, such physical separation between concentrator and receiver allows …
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Enabling a Sustainable Economy through Energy Systems Modeling: Solar-centric, Efficient, Integrated and Continuous Process Synthesis and Optimization
… nearly the efficiency attained by using the best multijunction photovoltaic cells along with batteries. In comparison, our proposed process has the following advantages: (i) It stores energy thermochemically with a two- to threefold higher density than batteries, (ii) coproduced hydrogen has …
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Design and fabrication of field-effect III-V Schottky junction solar cells
<p>“A new concept of field-effect photovoltaic devices with a focus on design and fabrication of single and multi-junction solar cells using III-V materials has been shown and proved. Schottky solar cells based on metal-(insulator)-semiconductor (M-I-S) structure have been designed and fabricated …
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Optical and electrical characterization of high-concentration photovoltaic systems = Caracterización óptica y eléctrica de sistemas fotovoltaicos de alta concentración
The record efficiencies achieved by multijunction (MJ) solar cells have renewed the interest in concentrator photovoltaics (CPV), as the use of high concentration is necessary to reduce the area of these expensive devices and to maximize their efficiency. The promise is a reduction of the cost of …
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Physical and optoelectronic properties of copper silver indium diselenide thin films
Increasing global energy consumption together with environmental concerns has led to much interest in alternative, cleaner sources of energy such as solar photovoltaic. Researchers in the solar cell community have been looking for ways to reduce costs while maintaining or increasing already high …