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 33 for “"seed layer"”.
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Synthesis of zinc oxide nanorods: seed layer annealing effect on electrical conductivity
… C), on annealed (500 ◦C) and un annealed gold seed layers. The mean square roughness of annealed and un annealed seed layers are 6.711 and 8.839 nm respectively. The morphological study of the prepared ZnO nanorods revealed a clear improvement in orientation of ZnO nanorods grown on annealed …
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Interface engineering and multi-modal characterization of co-evaporated metal halide perovskite films for efficient perovskite-silicon tandem solar cells
… the impact of PbI2, PbCl2, CsI and CsCl seed layers on the morphology, composition, and optoelectronic properties of co-evaporated FA0.8Cs0.2PbI2.7Br0.3 films. While all seed layers reduce band gap variability compared to reference samples, CsCl and CsI promote organic precursor …
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EFFECTS OF STRAIN ON DIELECTRIC PROPERTIES OF FERROELECTRIC Ba0.5Sr0.5TiO3 FILMS
… deposition (PLD) with introducing a sputtered seed layer of BST thin film. Compared with the BST film directly deposited on the substrate by PLD deposition, the films with a seed layer showed a large enhancement on the dielectric constant and tunability. The discussion on the change in film …
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Chemical vapor deposition of thin films for ULSI interconnect metallization
… have studied a batch CVD process for palladium seed layer deposition using H2 reduction of Pd(hfac)2 (Pd(II) hexafluoroacetylacetonate). Nano-sized Pd particles with nuclei density between 1 to 14 clusters/ƒÝm2 are observed using AFM. The quality of the Pd seed layer is examined by depositing …
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Transport in Low Pressure Plasma Reactors for Materials Processing
… used to deposit diffusion barriers and Cu seed layers into high aspect ratio trenches. Understanding plasma-substrate interactions will be critical to designing the next generation processes as the industry transitions to the 45-nm node. In this work, IMPVD using a hollow cathode magnetron …
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Zinc Oxide Nanorod Based Ultraviolet Detectors with Wheatstone Bridge Design
… was affected by varying the number of times the seed layer was spin coated, by varying the spin speed of seed layer coating and by varying the annealing temperature of the seed and rod. Based on these studies, optimum conditions for the fabrication of Wheatstone bridge UV ZnO nanorod detectors …
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Design and Fabrication of Electrostatically Actuated Serpentine-Hinged Nickel-Phosphorous Micromirror Devices
… the process makes use of thick photoresist layers as a sacrificial mold into which an amorphous nickel-phosphorous alloy may be deposited. Ideal design of the electrostatically actuated micro-mirrors was investigated, and a final design was selected and modeled using FEA software, which …
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Synthesis and characterization of Titanium Nitride Nanowires for neural-electrode coatings for improving electrode/neuron interface in the brain
… of TiN thin film onto a substrate to act as a seed layer for the growth of NWs, (2) the growth of titanium dioxide nanowires (TiO2-NWs) of high aspect ratio and crystallinity followed by (3) a novel plasma nitridation step using Plasma Enhanced Chemical Vapour Deposition (PECVD) which offered a …
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Hydrothermal synthesis of zinc oxide nanowire arrays for photovoltaic applications
… electron-beam lithography to template ZnO seed layers, demonstrating that seed layer engineering via judicious choice of seed deposition conditions and annealing can yield well-aligned nanowire arrays with single nanowire spatial precision on a variety of device relevant substrates. …
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Self-Aligned Fabrication of Nanogap Based Zinc Oxide Nanowire Schottky Devices Using Adhesion Lithography
… of nanometers. A-Lith uses self-assembled monolayers to alter the adhesion forces between metals or oxides, which can be overlapped and peeled away from each other to form asymmetric or symmetric nanogaps. To realize bottom-up nanowire devices using A-Lith, the growth of ZnO nanowires was first …
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Metal seed deposition from organic solutions for subsequent electroless plating
<p>"A novel process for immersion metal seed layer deposition on electronic material substrates from organic solutions for subsequent electroless Cu plating is being developed. The mechanism is based on spontaneous electrochemical displacement reactions. The more noble metal is reduced and …
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A novel method for the production of microwires
… coat the harvested nanofibers with a conductive seed layer via sputter deposition. Finally, I have designed a reel to reel system in order to electroplate over a segment of seeded nanofiber in order to achieve the target diameter. This now allows for the creation of microwires of considerable …
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Synthesis and characterization of two-dimensional transition metal dichalcogenides
… to synthesize high-quality and large-scale monolayer TMDCs. In this thesis, I have systematically investigated the growth of MoS2 and WSe2 using chemical vapor deposition (CVD) and metal-organic chemical vapor deposition (MOCVD) methods. I studied the impact of the growth conditions, including …
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Magneto-optical and multiferroic oxide thin films, integrated nonreciprocal photonic devices and multiferroic memory devices
… resonator chips (one PLD step, one RTA, YIG seed layer from the top) were progressively reduced to achieve improved integrated optical isolators with low insertion loss of 7.4 ± 1.8 dB and an isolation ratio of 13.0 ± 2.2 dB. We demonstrated that the ferrimagnetic insulator YIG thin films …
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In-situ Raman spectroscopy : a method to study and control the growth of microcrystalline silicon for thin-film solar cells
… thin-film solar cell is achieved if the absorber layer material is deposited close to the phase transition towards amorphous Silicon. Hence exact knowledge about and control of the deposition process is of great importance. This work deals with the design and application of a novel experiment that …
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High Anisotropy Magnetic Materials for Data Storage and Spintronic Memory
… the realization of the tetragonal phase Ru using seed layer engineering in thin films, and its associated ferromagnetic properties.
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Observation and characterisation of magnetisation ripple using Lorentz transmission electron microscopy
… to investigate the effect of ultra-thin Ni79Fe21 seed layers on the physical and magnetic properties of Ni45Fe55. The dramatic effect of seed layer addition resulted in grain size and texture reduction, an increase in uniaxial anisotropy and a reduction in magnetisation ripple properties. This …
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Growth and Characterization of Polycrystalline Rare-Earth Iron Garnet Films and Heterostructures
… scale thin films of garnets as polycrystalline layers on non-garnet substrates with perpendicular magnetic anisotropy. In this thesis, the growth of polycrystalline thin films of rare-earth iron garnets with controllable anisotropy and spin transport properties comparable to single crystal films …
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Mechanism of remote epitaxy using two dimensional materials
… has been the notion that the 2D material is the seed layer in van der Waals epitaxy. Notwithstanding, the substrate below the 2D material may play a role in orienting the crystalline growth of overlayers. This is supported by previous studies of a so called "long range" effect, where the …
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Magnetoelectric Oxide Nanocomposite Heterostructures
… BFO nanopillars in a BFO-CFO two phase layer on (111) STO as a seed layer on which to deposit a secondary top BiFeO3 layer. The growth mechanism and multiferroic properties of these new heterostructures were investigated. (ii) I demonstrated the formation of a new quasi-(0-3) …
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