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 66 for “"light trapping"”.
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Nanoimprint lithography for light trapping applications in solar cells
… (SCIL) process is adopted to fabricate efficient light trapping structures for thin-film solar cells. The SCIL process can achieve economical and large area patterns with high fidelity sub-micron resolution over non-planar surfaces without involving intense curing processes. We study and compare …
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Nanoimprint lithography for light trapping applications in solar cells
… (SCIL) process is adopted to fabricate efficient light trapping structures for thin-film solar cells. The SCIL process can achieve economical and large area patterns with high fidelity sub-micron resolution over non-planar surfaces without involving intense curing processes. We study and compare …
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Sensing and timekeeping using a light-trapping diamond waveguide
Solid-state quantum systems have emerged as promising sensing platforms. In particular, the spin properties of nitrogen vacancy (NV) color centers in diamond make them outstanding sensors of magnetic fields, electric fields, and temperature under ambient conditions. This thesis focuses on …
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Ultrathin crystalline silicon solar cells incorporating advanced light-trapping structures
… from reduced photon absorption. A range of light management structures have been proposed in the literature to address this issue and many have been demonstrated to provide high absorption across the spectral range relevant to crystalline silicon, but their promise has yet to be realized in …
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Technological assessment of light-trapping technology for thin-film Si solar cell
The proposed light trapping technology of Distributed Bragg Reflector (DBR) with Diffraction Grating (DG) and Anti-Reflection Coating (ARC) for thin film Si solar cell was analyzed from the technology, market, and implementation perspectives. Two applications were investigated. For monocrystalline …
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A ray tracing investigation of light trapping due to grooves in solar cells
… is to texture the cell surface so that it traps light better, allowing more light to be absorbed and converted to electrical energy. Professor Sachs and Dr. James Bredt have developed a texturing scheme that consists of trenches etched on the top surface of the silicon cell. The profile of the …
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High efficiency thin film silicon solar cells with novel light trapping : principle, design and processing
… indirect bandgap. This thesis invents a novel light trapping scheme, the textured photonic crystal (TPC) backside reflector, which can enhance path length by at least several hundred times the film thickness for sufficient absorption. Physical principles and design optimization of TPC are …
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High Performance Silicon Optoelectronic Devices Enabled by Photocarrier Transport-Recombination Engineering and Surface Light-Trapping Topologies
… optoelectronic devices. The need for light-trapping strategies to enhance the overall optical absorption of semiconductor devices has inspired a wide variety of studies and applications. Consequently, understanding and effectively manipulating surface recombination and carrier …
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Ultrathin mono-crystalline silicon photovoltaic cells with mechanically flexible and stretchable designs, and light-trapping structures
In recent years, research in flexible electronic systems has paid increasing attention to their potential to create and manipulate new classes of applications (e.g., foldable and flexible display, flexible photovoltaic, epidermal electronics, and other systems) that can be integrated outside of …
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Low cost manufacturing of light trapping features on multi-crystalline silicon solar cells : jet etching method and cost analysis
… to determine low cost methods to improve the light trapping ability of multi-crystalline solar cells. We focused our work on improving current wet etching methods to achieve the desired light trapping features which consists in micro-scale trenches with parabolic cross-sectional profiles with …
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Investigation of porous alumina as a self-assembled diffractive element to facilitate light trapping in thin film silicon solar cells
… to the poor absorption of longer wavelengths of light in the very thin active layer. One method of improving the efficiency of thin film solar cells is to use light trapping to increase the path length of long wavelength light to increase the probability of absorption. Previous work has yielded a …
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Chalcogenide glasses for advanced photonic and photovoltaic applications
… glasses can be used for the solar cell light trapping applications. We theoretically analyzed and numerically designed novel light-trapping grating structures which provides light trapping enhancement well exceeding the conventional Lambertian limit, by breaking the structural symmetry …
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Thin-film silicon solar cells : photonic design, process and fundamentals
… photonic crystal (PC) based structure to improve light absorption in thin-film Si solar cells. The PC structure combines a dielectric grating layer and a distributed Bragg reflector (DBR) for effcient light scattering and reflection, increasing light path length in the thin-film cell. We have …
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Ultra-thin photovoltaic technologies with nanophotonic textures for enhanced solar energy harvesting
… is intrinsically related to the efficiency of sunlight absorption and power generation. Maximising the absorption of sunlight in ultra-thin solar cells requires careful optimisation of the full device design, tailored to minimise i) front surface reflection by means of antireflection coatings, ii) …
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Self-assembled Plasmonic Nanostructures for Thin Film Photovoltaics
… metallic nanoparticles (NPs) for the light trapping application in thin lm photovoltaics (PV). Photovoltaics is able provide safe and clean electricity of the future, inparticular, thin lms solar cells have a potential to increase the competitiveness of PV through a substantial …
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Local absorption enhancement of light in tailored disordered amorphous silicon thin-films
… films are investigated with regards to their light trapping capabilities and local absorption. Computational optimization of thin films leads to design guidelines by which several nanotextures are fabricated. The investigation of the fabricated nanotextures via short laser pulse excitation …
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Optical and Electrical Enhancement of Organic Solar Cells.
… by researchers. Two of these are optical light trapping to increase absorption and control of interfaces to reduce energy loss. This thesis makes contributions to both of these goals in three ways. First, some surprising results from the optical modeling of organic solar cells at …
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Möglichkeiten und Grenzen des Lichtfangs bei der ökologischen Bewertung von Nachtfalter-Artenspektren : ein Vergleich zwischen der räumlichen Verteilung von Nachtfalterimagines und der ihrer Präimaginalstadien
… several years was to evaluate the suitability of light-trapping methods for studying the ecology of moths in general as well as questions concerning nature conservation in particular. It addresses the question as to whether and to what extent the habitats of adult moths and their respective …
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Lichtstreuende Oberflächen, Schichten und Schichtsysteme zur Verbesserung der Lichteinkopplung in Silizium-Dünnschichtsolarzellen
This doctoral thesis addresses the light yield and the optical loss mechanisms in thin-film solar cells based on amorphous (a-Si:H) and microcrystalline (µc-Si:H) silicon. The study focuses on the optimization of the aluminum-doped zinc oxide (ZnO:Al) front contact, which has to combine low series …
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Structure, Rheology and Optical Properties of Plasmonic Fluids
… for applications such as molecular detection and light trapping in photovoltaics. Cationic surfactants such as cetyl-trimethylammonium bromide have the ability to self assemble with metallic nanoparticles to form a corona or a double-layer vesicular structure. These structures upon further …
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