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.
Results
Showing 1 to 20 of 88 for “"Solar spectrum"”.
-
High quality optical and optoelectronic materials for efficient light management and solar spectrum control and conversion
… of expensive materials and processing. Silicon solar microcells are re-designed to account for high series resistance and poor absorption. A back contact design significantly reduces the series resistance within the solar microcell and allows for an anti-reflection coating on the front surface …
-
Development of a light detection system for bidirectional measurements over the solar spectrum and sun course simulations with scale models
The use of natural light in building structures can increase energy efficiency and lead to more sustainable architecture. To encourage such use of natural light, a dual experimental device is being developed at MIT to help evaluate the effectiveness of various daylighting approaches, to be used as …
-
Enhancing solar fuel synthesis via complementary approaches: round-the-clock operation and heat utilisation
… However, the inefficient utilisation of the solar spectrum limits its commercial viability. Requiring high energy photons to drive the reaction, a large portion of the solar spectrum, particularly visible (Vis) and infrared (IR) energy, could not be converted for most solar fuel synthesis, …
-
The thermal performance of fixed and variable selective transmitters in commercial architecture
… largely reflect the invisible portion of the solar spectrum and contain only heat and which establish a range of operating cost bases; and (c) newly proposed electro-chromic glazing materials which variable transmit both the heat and daylight portions of the solar spectrum. This parametric …
-
Studies of interaction of dye molecules with TiO2 Brookite clusters for application in dye sensitized solar cells
Dye sensitized solar cells (DSSCs) have attracted rapid interest over the recent years with prospect of emerging as a viable alternative to conventional silicon based solar cells. The photoanode of DSSCs comprises of dye molecules anchored to the surface of semiconductors such as TiO2. However, the …
-
Selective solar absorber materials : nanostructured surfaces via scalable synthesis
Current solar to thermal energy conversion technologies, including concentrated solar power (CSP) and solar water heaters (SWH) utilize absorber surfaces that collect incident solar radiation. However, these absorber surfaces emit thermal energy (at their temperature) in the infrared (IR) spectrum, …
-
Modeling, fabrication and optimization of optically transparent - thermally insulating silica aerogels for solar thermal applications
Solar thermal energy conversion has the potential to reduce greenhouse gas emissions via the offset of fossil fuel burning power generation methods. By capturing the suns energy and using it to heat steam as part of a Rankine cycle, electrical energy can be renewably produced. Furthermore, solar …
-
Structural and electronic properties of noble metals on metal oxide surfaces
… excitations at ~ 3.8eV, in the UV part of the solar spectrum. We have found that when we encapsulated the titania supported Ag clusters in a thin titania overcapping layer, the nanoclusters retain their structural integrity and we find that new excitations are induced that better match the …
-
Synthesis of heteroaromatic ruthenium dyes for use as electron reservoirs in dye-sensitized solar cells
<p>Increasing the usable portion of solar spectrum is a key factor in increasing the efficiency of modern solar cells. The near-IR region of the solar spectrum is often underutilized as a means of energy production, as the photons in this region do not contain enough energy to promote electrons to …
-
HIGHLY-CONCENTRATED SUNLIGHT SEPARATION FOR WIDE-SPECTRUM SOLAR ENERGY HARVESTING
… Resultantly, the majority portion of AM1.5 spectrum (1.2 μm ≤ λ ≤ 2.5 μm) that cannot undergo PV conversion often contribute to thermal degradation of c-Si cells and waste heat. Furthermore, current technologies aiming to utilize broader solar spectrum ranges have either expensive …
-
Where solar thermal meets photovoltaic for high-efficiency power conversion
… of existing technologies that limit performance. Solar thermal and solar photovoltaic schemes dominate today's solar market but both bring intrinsic and practical constraints. What will tomorrow's solar market look like? Third generation solar power generation techniques to utilize a larger …
-
Electrical, electronic and optical properties of MoSe2 and WSe2
… intrinsic band-gap in the visible region of the solar spectrum (400nm - 700nm) which makes them distinct from other 2-D materials like graphene. In this study, the electrical, electronic and optical properties of monolayer and bulk MoSe_2 and WSe_2 are studied. The electronic band structures are …
-
New methods for measuring spectral bi-directional transmission and reflection using digital cameras
… are increasingly being used to distribute solar radiation purposefully in buildings. Distribution of visible light and near infrared radiation can be optimized to enhance daylighting and reduce thermal loads. Light redirecting window systems are one of many innovative fenestration systems …
-
Nanostructured nitrogen and carbon codoped TiO2 thin films: synthesis, structural characterization and optoelectronic properties
… in applications like photocatalysis, sensors, solar cells, and memory devices because it is inexpensive, abundant, nontoxic and stable in aqueous solution. Another exciting application where TiO 2 has the potential to be a very useful catalyst is the clean hydrogen generation using solar …
-
THREE DIMENSIONAL SOLAR CELLS ---- BASED ON OPTICAL CONFINEMENT GEOMETRIES
The three dimensional (3D) solar cells were designed to improve the overall performance of organic absorbers using optical confinement geometry such as fiber and tube, briefly Optical Confinement Geometry Photovoltaics (OCGPV). The idea behind this device was to decouple the optical path of the …
-
GEOMETRY AND MORPHOLOGY OF TiO2 AND Fe2O3 NANOTUBES FOR SOLAR PHOTOLYSIS OF WATER
… show 18% visible light activity under simulated solar light. The nitrogen annealed samples showed highest photocatalytic activity when compared to oxygen and hydrogen annealed samples. The structural properties of these novel structures have been studied extensively. In addition to this, smooth …
-
Smart coatings for energy saving buildings
… which do not absorb the infrared portion of the solar spectrum. Cool coatings applied over buildings surface provide an effective solution for passive cooling of building indoors and influencing local outdoor microclimate, mitigating urban heat islands effect (UHIE). The primary purpose is to …
-
Band Gap Engineering Of Titania Systems Purposed For Photocatalytic Activity
… exhibiting band gaps better suited for the solar spectrum, then the band gap must be subsequently reduced. To lower the energy needed for electronic excitation, both transition metals and non-metals have been extensively researched and are currently viable candidates for the continued …
-
Measuring photometric and spectral radiometric bi-directional transmission and reflection in a video-goniospectrometer
… the visible and near infrared portions of the solar spectrum. This thesis seeks to describe the most recent advancements in the development of the Heliodome-the completion and characterization of the spheroidal mirror component, the integration of a spectral estimation method, the photometric …
-
GaInN/GaN Schottky Barrier Solar Cells
GaInN has the potential to revolutionize the solar cell industry, enabling higher efficiency solar cells with its wide bandgap range spanning the entire solar spectrum. However, material quality issues stemming from the large lattice mismatch between its binary endpoints and questionable range of …
Page 1 of 5