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 31 for “"anti-reflection."”.
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Nanoparticle Encapsulation and Aggregation Control in Anti-reflection Coatings and Organic Photovoltaics
… layers to enable their effectiveness in both anti-reflection coatings (ARCs) and organic photovoltaics (OPVs). Ionic self-assembled multilayers (ISAMs) fabrication of poly(allylamine hydrochloride) (PAH) and silica nanoparticles (SiO2 NPs) results in highly-transparent, porous ARCs. However, …
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Anti-reflection zinc oxide nanocones for higher efficiency thin-film silicon solar cells
… market. One source of inefficiency is the light reflection off the interface between the thin film cell's top Transparent Conducting Oxide (TCO) and the light absorbing silicon. In this work, we demonstrate the use of nanocone textured ZnO as the anti-reflection surface that mitigates this …
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Investigation of Light Induced Degradation in Promising Photovoltaic Grade Si and Development of Porous Silicon Anti-Reflection Coatings for Silicon Solar Cells
… for the formation of an effective porous silicon anti-reflection coating. This resulted in a porous silicon anti-reflection coated solar cell efficiency of 15.3% on a float zone Si sample with an excellent fill factor (78.7%). The typical process used in the literature involves porous silicon …
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Improvement of the Optical and Mechanical Properties of Silica Nanoparticle Ionic Self-Assembled Multilayer Anti-Reflection Coatings on Glass and Polycarbonate Substrates
This thesis presents the characterization of the optical and mechanical properties of silica nanoparticle films fabricated by ionic self-assembly, also known as layer-by-layer (LbL) deposition. Utilizing electrostatic attraction of oppositely-charged materials permits uniform and rapid growth of …
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Evaluation of superhydrophilic polyelectrolyte multilayered films for anti-fogging applications
… that demonstrate great promise for anti-fogging and anti-reflection glass coating applications. The automotive glass industry is then identified as a potential market for this technology, and competing anti-fogging technologies as well as relevant intellectual property are reviewed …
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Technological assessment of light-trapping technology for thin-film Si solar cell
… (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 thin film Si solar cell, layer transfer technology is too …
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Salty development of an optical photoresist
… In order to measure contrast, we designed an anti-reflection coating stack to reduce reflections between the photomask and the photoresist. After development, we observe that for 400 nm exposures of photoresist PS4 that there is no significant change in contrast with salty development, …
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Atmospheric Pressure Chemical Vapor Deposition of Functional Oxide Materials for Crystalline Silicon Solar Cells
… increasing parasitic absorption within the anti-reflection coating(s); (2) to maximize internal back reflectance of rear passivated cells, thereby increasing optical absorption of weakly absorbed long wavelength photons (? > 900 nm); (3) to minimize recombination losses by providing …
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Superconducting nanowire single-photon detectors and sub-10-nm lithography
… and fabricated an integrated optical cavity and anti-reflection coating that enhanced the detection efficiency of SNSPDs by almost threefold to current record values of 57% at 1550 nm wavelength. We also improved our understanding of SNSPDs by modeling the electro-thermal response of the …
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Optical properties of black silicon - an analysis
… must be maximized. In the solar cell industry, anti-reflection (AR) coating is used to suppress reflection losses. AR coatings are limited in use because they only reduce the reflectance for a narrow range of wavelengths and incident angle since their functionality is based on a …
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Resolution limits and process latitude of comformable contact nano-lithography
… an optimized trilayer stack design of 225nm of anti-reflection-coating chemically separated from the resist by 70nm of evaporated silicon oxide. This design results in less than 1.5% back-reflection from the oxide into the resist for 10% film thickness variation. Finite-difference time-domain …
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Acoustic Scattering by Gratings
… the use of layered perforated structures such as anti-reflection or anti-transmission coatings. The investigation of the acoustic behaviour of these periodic structures is used to construct a homogenisation model for an effective surface with an effective impedance parameter. The homogenised model …
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Magnetic nanostructures patterned by block copolymer lithography
… polymeric templates fabricated out of BARL-i@ anti reflection coating guide the self-assembly of PFS domains with good LRO and very few defects over a large area. The ordered arrays were then transferred into silica and W, forming an ordered array of cp-packed W islands with period of 29 nm and …
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PH-gated porosity and reversible swelling transitions in polyelectrolyte multilayers
… - 1.15 and can be employed as high-performance anti-reflection coatings. Several designs of optical coatings are demonstrated, as is the ability to pattern these coatings by a simple aqueous technique. The ability to reversibly uptake and release molecular species from the pH-gated porous …
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Research Towards the Development of an Optically Pumped Cesium Dimer Laser
… reaching the enclosure windows and corroding the anti-reflection coatings, calculating Frank-Condon coefficients of the first 90 levels of the ground and excited vibrational states of Cs2, and recording all of the Cs2 emission spectra from 750 nm to 800 nm. Each of these achievements will be …
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Fabrication and Optimization of Single-Junction GaAs Thin Film Solar Cells on Epi-ready Flexible Metal Tapes for Low-cost Photovoltaics
… a process of cap layer removal (passivation) and anti-reflection coating. Efficiency greater than 6% with open circuit voltage (VOC) of 566mV, fill factor (FF) of 68%, short circuit current density (JSC) of 17.4mA/cm2 was obtained. Steps were taken to improve the quality of p-n junction by …
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Subwavelength antireflection and polarization grating elements: Analysis and fabrication
… These gratings can be used as equivalent anti-reflection coatings and as polarization elements. Since the grating structures are etched into the substrate material, these optical elements are durable and chemically resistant compared to resist gratings. Subwavelength elements may play a …
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Fabrication and light management of microscale solar cells
… as both an etching/doping mask and a passivation/anti-reflection layer. Combined with a backside-reflector and a polymer waveguide, these ribbon-like miniature semiconductor membranes demonstrate performance merits that are comparable to commercial silicon solar cells, albeit with significantly …
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Fabrication and transfer assembly of microscale, solid-state light emitting diodes and solar cells for transparent and flexible electronics applications
… silicon dioxide which naturally doubles as an anti-reflection and passivation layer. Other improvements to previous performance metrics comes from optimized cell assembly onto structures that recycle and redistribute incident irradiation.
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Strategies for incorporating functional block copolymers into polyelectrolyte multilayer coatings
… LbL assembly in creating conformal thin UV anti-reflection coatings for PMMA Fresnel lenses is demonstrated. Key features of thin porous nanoparticle coating assembly via LbL is discussed, including how particle size and deposition pH can tune the coating porosity and refractive index. In …
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