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 168 for “"Light Absorption"”.
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Enhancement of Light Absorption Efficiency of Solar Cell Using Dual
… cases. The Triangular grating achieved higher light absorption compared to rectangular grating. The best top grating was around 200nm grating period. We realized solar cell efficiency improvement about 42.4% for the triangular rectangular (top-bottom) grating.</p> <p>We studied the light …
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Quantum confinement effects on light absorption in Germanium for solar energy conversion
… due to its quasi-direct bandgap, higher absorption coefficient and larger exciton Bohr radius with respect to Si, giving the chance to easily tune the optical properties by exploiting quantum confinement effect (QCE). However, the properties of Ge quantum dots (QDs) depends not only on …
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Development Of A Supercontinuum Based Photoacoustic Aerosol Light Absorption And Albedo Spectrometer (PALAAS)
… photoacoustic instrument to measure the light absorption and scattering coefficients of aerosols. Collimation techniques for supercontinuum sources using lens-based and off-axis parabolic mirror-based collimators were evaluated and it was determined that the off-axis mirror had superior …
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Calcium vapour deposition on semiconducting polymers studied by adsorption calorimetry and visible light absorption
… surface density of 3.5 sites/nm². Optical absorption experiments, using either a 1.85 eV diode laser or a xenon lamp coupled to a scanning monochromator, have also been performed using the same calorimeter sensor. In the case of MEH-PPV, using the laser we find an optical absorption …
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Oceanic Light Absorption Properties: Assessment and Characterization in the Southeastern Bering Sea Using Field and Satellite Observations
… this dissertation was to i) assess phytoplankton absorption of culture and seawater samples using spectrophotometric and pigment reconstruction methods and ii) obtain a suite of in-water measurements for characterization and parameterization of light absorption properties in the southeastern …
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Observations from working with a simple mathematical model of light absorption by small particles in the ocean
… cell types, a simple mathematical model of light absorption was constructed in MATLAB, in order to investigate the effects of depth, cell size, and water on light absorption by a layer of water containing suspended particles. The model takes chlorophyll a absorption data, cell diameter, …
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Light energy management in peach: utilization, photoprotection , photodamage and recovery. Maximizing light absorption in orchard is not always the best solution
The relation between the intercepted light and orchard productivity was considered linear, although this dependence seems to be more subordinate to planting system rather than light intensity. At whole plant level not always the increase of irradiance determines productivity improvement. One of the …
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An Assessment of Indoor Infiltration Parameters for Black Carbon from Residential Wood Combustion and the Spectral Dependence of Light Absorption for Organic Carbon
… The second part of this study investigated the light absorption properties of organic carbon from residential wood combustion, the dominant fraction of woodsmoke. To assess woodsmoke variation, a study conducted parallel to the one presented in this thesis (Ward, 2009), a grid array of personal …
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In Situ Characterization of Optical Absorption by Carbonaceous Aerosols: Calibration and Measurement
Light absorption by aerosols has a great impact on climate change. A Photoacoustic spectrometer (PA) coupled with aerosol-based classification techniques represents an in situ method that can quantify the light absorption by aerosols in a real time, yet significant differences have been reported …
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Investigation on nanostructured solar cells
… solar cells in all respects because it increased light absorption by promoting the CdSe absorber growth, increased resistance against recombination by forming a physical barrier and passivating the interface, and improved electron injection and transport. It is important to increase the amount of …
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Surface plasmon polariton mediated energy transfer from external antennas into organic photovoltaic cells
… devices in recent years, the tradeoff between light absorption and charge separation efficiency remains pervasive; increasing light absorption by increasing the device thickness leads to a decrease in exciton diffusion efficiency and vice versa. In this thesis, I demonstrate organic solar cells …
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Advances in Phenyl-Modified Carbon Nitride: Towards Sustainable Environmental Applications
… phenomenon called ‘photocatalysis’, where solar light can be utilized to degrade pollutants and obtain useful products. Traditional graphitic carbon nitride (g-C3N4) has shown potential in photocatalytic applications due to its chemical stability, visible-light response, and eco-friendly …
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SYNTHESIS OF Ti02- BASED PHOTOCATALYSTS FOR PHOTOCATALYTIC H2 GENERATION
… bandgap of TiO2, its photoactivity to solar light is limited. This initiates the works to design TiO2-based nanocomposites which further extend the light absorption beyond the UV region. This work has modified TiO2 materials for further improve their photocatalytic hydrogen generation …
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Theoretical Investigations of the Photophysical Properties of Chromophoric Metal-Organic Frameworks
… Nevertheless, this novel research has highlighted the potential to improve the photophysical properties of PP-based SURMOFs by (i) introducing various functional groups or metal ions to the PP-core and (ii) controlling the PP-stacking behavior in layered materials. To overcome the posed …
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Optical properties of light absorbing organic carbon aerosol and its mixtures at high sub-saturated humidities
… on climate is dependent on the balance between absorption and scattering of light by the particles, which are affected by ambient relative humidity (RH). Although absorption and scattering have been measured under dry conditions, their measurement at high RH requires laboratory measurements with …
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Understanding the Sources, Atmospheric Evolution and Radiative Effect of Brown Carbon Aerosol Particles
… OA, referred to as brown carbon (BrC), absorbs light in the lower visible to ultraviolet range. BrC can be emitted from incomplete combustions and can also be generated through secondary processes. The radiative impact of BrC on climate is difficult to assess owing to the lack of knowledge about …
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Applications of nanoimprinted structures to organic photovoltaics
… from reduced optical path lengths, which hinder light absorption and hence, power conversion efficiency. Many designs have been proposed to improve light absorption. A novel light-trapping substrate geometry for OPVs is presented which is based on a conformally-coated, subwavelength-textured …
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Computational study of low index surface of an anatase TiO2 doped with ruthenium (Ru) and strontium (sr) for application in Dye sensitized solar cells
… the most important way of enhancing the visible light absorption, in order to improve the efficiency of the dye sensitized solar cells (DSSCs). In this study, first principle density functional theory was used to investigate electronic and optical properties of bulk anatase TiO2, undoped, and …
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Room-Temperature Terahertz Detection Based on Graphene and Plasmonic Antenna Arrays
… However, the challenge is its insufficient light absorption that largely limits the responsivity. The first design is based on an array of planar antennas arranged in series and shorted by graphene squares. Highly efficient photodetection can be achieved by using the metallic antenna to …
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