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 19 of 19 for “"solution deposition"”.
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YBa2Cu3O7-x thin films prepared by Chemical Solution Deposition
… length YBCO films, the cost effective chemical solution deposition (CSD) procedure was selected, given that no vacuum technology is required. To reveal the flexibility and the good optimization possibilities of the CSD approach two main processes were chosen for comparison: a fluorine-free …
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Chemical evolution, heteroepitaxy, and monolayer patterning of solution-derived lithium niobate thin layers
… efficient photonic circuit element applications. Solution deposition of such films on near lattice-matched substrates has been conducted, allowing low temperature processing, stoichiometry control, doping capability, and waveguiding analysis of heteroepitaxial thin layers. The structural …
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Preparations and Characterizations of Tantalum Pentoxide-Titanium Dioxide: Ceramics and Thin Films
A chemical-solution deposition method was used to integrate thin films of Ta2O5-TiO2 onto silicon substrates. Precursor solutions were successfully prepared using Ta(OEt)5 and Ti(OEt) 4 in ethanol. Solution stability was shown to be influenced by several factors, including, Rw ratio, additions of …
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Solution-Based Deposition of Ultrathin Metal Oxide Films on Metal and Superconductor Surfaces
Solution deposition from Zr4(OPrn) 16 was also used to deposit ultrathin zirconia films on gold, silver, and aluminum surfaces. X-ray photoelectron spectroscopy and atomic force microscopy were used to compare the physical properties of these films. Electrical measurements showed that zirconia …
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Solution Routes to Metal Chalcogenide and Zinc Oxide Thin Films for Device Applications
… optical devices, and photoelectronic devices. Solution deposition of semiconductor thin films draws increasing attention since it offers low cost, high-throughput production, and better compatibility with flexible or polymeric substrates compared to the vacuum deposition. This dissertation …
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Functional Metal Oxide Coatings from Molecular Precursors for Energy Applications
… and conversion technologies. In this thesis, the solution-deposition of coatings from molecular precursors is explored as a promising approach towards this end. First, a facile method for the deposition of electrocatalytically active zirconium-based films for photoelectrochemical water oxidation …
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Metal oxide/organic interface investigations for photovoltaic devices
… behind these in- stabilities. A simple sol-gel solution deposition technique for the fabrication of stable and highly performing transparent conducting mixed metal oxides (ZnMO) is presented. It is demonstrated that the use of amorphous, mixed metal oxides allows improving the performance and …
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Earth-Abundant Thin-Film Devices for Photovoltaic and Electrochemical Applications
… will require inexpensive, scalable technological solutions. This thesis focuses on the technological development of devices which address two of these 21st-century challenges: global climate change and increasing pharmaceutical contamination of water supplies. Solution-processed Cu2ZnSnSe4 (CZTS) …
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Characterisation of solution processed zinc oxide quasi-superlattice materials for thin film applications
… range of applications in modern optoelectronics. Solution processing allows for novel properties of oxide materials to be investigated through low-cost and scalable techniques in an effort to challenge the current vacuum-based state of the art in metal oxide semiconductor deposition. This work …
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Preparation and characterization of doped lead zirconate titanate Pb(Zr<sub>x</sub>Ti<sub>1-x</sub>)O₃ films
… thin films were prepared by chemical solution deposition and spin-coating method. The precursors for making the undoped PZT films were derived from lead acetate, zirconium n-propoxide, and titanium iso-propoxide. In addition, lanthanum acetylacetonate, neodymium acetate, and niobium …
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Synthesis and Characterization of Ferroelectric (1-x)SrBi2Ta2O9-xBi3TaTiO9 thin films for Non-volatile memory Applications
… thin films fabricated by modified metalorganic solution deposition technique showed much improved properties compared to SrBi2Ta2O9: a leading candidate material for memory applications. A pyrochlore free crystalline phase was obtained at a low annealing temperature of 600 oC and grain size was …
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Nucleation and growth of unsubstituted metal phthalocyanine films from solution on planar substrates
… solar cells with Pcs are produced by vapor deposition, although solution based deposition (like spin casting) is cheaper and offers more possibilities to control the structure of the film. With solution based deposition several parameters (like temperature, solvent and etc.) affect the …
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An Investigation into the Decontamination of Carbon-14 from Irradiated Graphite
… the deposits present on reactor graphite. Two deposition techniques were investigated: microwave plasma assisted chemical vapour deposition and a combination of solution deposition and charring. C-13 precursors were used as they facilitate the study of the selective removal of the deposit by …
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Fabricating and Tailoring Halide Perovskites for Photovoltaic Applications
… energy harvesting is the heart of potential solutions for the energy crisis. Halide perovskites are leading candidates to replace silicon in next generation solar cells. This thesis focuses on halide perovskite materials, aiming to understand their structure, electronic and ionic properties …
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Development and Characterisation of Halide Perovskite Visible Light and X-Ray Detection Devices
… impressive properties after low-temperature solution deposition. The device structure decouples the dimensions of photon absorption and charge carrier collection to retain performance across the X-ray spectrum, overcoming the limitations currently preventing the commercial success of direct …
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Deposition and characterisation of bismuth layer-structured ferroelectric films
… electrical properties. This work deals with the deposition and characterisation of epitaxial and polycrystalline W-doped SrBi2Ta2O9 (SBT) and lanthanide-doped bismuth titanate (BiT) films. SBT and W-doped SBT films were fabricated by pulsed laser deposition (PLD) on platinised silicon substrates. …
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Aqueous-Derived Thin Films and their Interfacial Interactions with Semiconductor Surfaces: A Spectroscopic Study
… vacuum-based techniques, such as chemical vapor deposition (CVD), to deposit metal oxide films. These vapor-phase deposition techniques suffer due to their slow deposition rates and their use of expensive equipment. Additionally, these processes sometimes require the use of harmful source gases …
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Multiferroic BiFeO3 films and nanostructures for hybrid energy harvesters
… the following work has been focused on the deposition by metal-organic vapor phase deposition of multiferroic BiFeO3 films and nanostructures. BiFeO3 is a multiferroic material and can maintain its properties in extreme environments thanks to its Curie and Neel temperatures well above room …
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Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics
… resistance through a nanoscale chemical vapor deposition (CVD) process. We show that by passing current through the CNT devices in the presence of CVD precursor, localized Joule heating induced at the CNT junctions stimulates selective and self-limiting deposition of metallic nanosolder. We …