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 138 for “"active layer"”.
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Photophysical Studies of Active Layer Compositions in Organic Solar Cells
… rely on a donor-acceptor configuration in the active layer. An inherent characteristic of OSCs is that they form tightly bound electron-hole pairs (excitons) following photoexcitation and as these excitons separate, they form charge-transfer (CT) states. The formation and characteristics of …
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P3HT:PCBM-based organic solar cells : Optimisation of active layer nanostructure and interface properties.
… C[61] butyric acid methyl ester (PCBM) as an active layer in the ratio of (1:1) (P3HT:PCBM). The efficiency and stability of P3HT:PCBM-based solar cells have been examined using different methods and employing novel materials such as1-[N-(2-ethoxyethyl) pent-4-ynamide] -8 (11), 15 (18), 22 …
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Analysis of microtopography, vegetation, and active-layer thickness using terrestrial LIDAR and kite photography, Barrow, AK
… change. This study examined changes in the active layer of permafrost near Barrow, Alaska at very fine scale to capture subtle changes related to microtopography and landcover. In 2010, terrestrial LIDAR was used to collect high-resolution elevation data for four 10 m × 10 m plots where …
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Analysis of microtopography, vegetation, and active-layer thickness using terrestrial LIDAR and kite photography, Barrow, AK
… change. This study examined changes in the active layer of permafrost near Barrow, Alaska at very fine scale to capture subtle changes related to microtopography and landcover. In 2010, terrestrial LIDAR was used to collect high-resolution elevation data for four 10 m × 10 m plots where …
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Partitioning and Diffusivity of arsenic(III) in the Active Layer of Thin-Film Composite Reverse Osmosis and Nanofiltration Membranes
… composition, thickness and roughness of membrane active layer; (2) characterization of the partitioning behavior of neutral and ionic species at various pH and concentration conditions; (3) differentiation of diffusive permeation from advection with permeation data using a simplified …
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Design and Characterization of Electrospun Mats with Tailored Morphologies for Enhanced Active Layer Performance in Energy Conversion and Energy Storage Applications
… by the electrospinning process to improve the active layer performance in energy conversion devices as well as to better understand the relationship between morphology and performance in energy storage devices. Discrete control of the active layer morphology can promote exciton dissociation in …
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… generations on percolation behaviors and new active layer formation. The membrane structures are further characterized by Rutherford backscattering spectrometry (RBS) and atomic force microscopy (AFM) techniques, suggesting a low-level accumulation of dendrimers inside the TFC-S NF membranes …
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A Microscopic Continuum Model of a Proton Exchange Membrane Fuel Cell Electrode Catalyst Layer
… continuum models of the cathode catalyst layer (active layer) of a proton exchange membrane fuel cell are developed and presented. This model incorporates O₂ species and ion transport while taking a discrete look at the platinum particles within the active layer. The original 2-dimensional …
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Stability Investigation of Silicon Nanowire Solar Cells
… investigation of the stability of the proposed active layer for the photovoltaic solar cell. It begins by providing a brief overview of the research and the recent development in solar cells. Then it describes the fabrication and characterisation techniques used in developing solar cells' …
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Optimization of PEDOT: PSS thin film for organic solar cell application
… devices were produced by spin coating organic layers onto ITO coated glass in air, and deposited it with an Au layer as top metal electrode. Inverted devices were fabricated with and without PEDOT:PSS. Then, several attempts have been conducted to improve power conversion efficiency by …
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Structural effects of chloraminated seawater on the SW30HR reverse osmosis membrane
… osmosis (RO) membranes, react with the polymeric active layer and affect membrane performance as a result. This work investigates structural and performance changes to the SW30HR RO membrane exposed to seawater disinfected with monochloramine. Batch experiments with RO membranes were conducted to …
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Fused Arene-Based Molecular Systems as Additives for Organic Photovoltaics
… macromolecules, and polymers, which form an active layer in photovoltaics. They act as an active material in absorbing light and causing charge mobility to generate electricity from sunlight. This thesis describes the molecular systems derived from fused arenes such as anthracene, pyrene, …
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Forced and Unforced Permafrost Changes in the Northern Hemisphere during 1901-2100
… in both spatial and temporal coverage. Active layer thickness (ALT) modeling is another approach that can overcome many of these limitations, but the models have large uncertainty in predicting future permafrost changes.This doctoral research firstly investigated the impacts of climate …
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Highly absorptive thin films for integrated photonic devices
Highly absorptive thin films serve as the active layer of a new class of photonic devices based on the strong coupling of light and matter. In order to develop these devices into a new field of integrated photonics, methods for analysis, patterning, and deposition of the active layer are necessary. …
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Effect of feed temperature on the performance and properties of the NF270 membrane
… of the membrane: pore radius, effective active layer thickness, and volumetric charge density. From 25°C to 40°C, the fitted parameters showed a 29% increase in pore size, and an 84% increase in effective active layer thickness; volumetric charge density increased in magnitude by …
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Rotary kiln transport phenomena: a study of the bed motion and heat transfer
… by a yield criterion. By considering the active layer (the shearing region near the bed surface) to be thin, relative to the chord length, the applied granular flow equations reduce to the boundary layer equations of Prandtl, which are solved to obtain the active layer thickness and the …
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Nanoscale Selective Area Epitaxy for Optoelectronic Devices
… is an entirely novel structure, the nanopore active layer, which demonstrates the potential for this process to extend beyond the constraints of self-assembly. The nanopore active layer consists of a periodic array of high bandgap barrier regions perturbing a lower bandgap planar quantum well. …
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Photodetectors based on colloidal quantum dots
… and by recent successes incorporating single monolayers of QDs in light-emitting devices (QD-LEDs), we set out to develop thin-film, layered photodetectors in which the active layer is a chemically annealed QD solid. This thesis reports initial steps in this development. Chapters 1 and 2 contain …
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Functional Protein Based Materials
… hydrogels for use in soft actuators. A gelatin bilayer system was designed where an active layer swelled more than a passive layer to cause the system to bend/actuate in response to an environmental stimulus. In Chapter III, gelatin layers were chemically crosslinked to different degrees with …
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