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 27 for “"Doped ZnO"”.
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Origin of solid-state activated sintering in BiO₂₃-doped ZnO.
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Doped ZnO nanoparticles in biomedicine: their role as stimuli-responsive anticancer agents
L'abstract è presente nell'allegato / the abstract is in the attachment
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Hydrothermal synthesis of Al-doped ZnO nanowires and their application for photovoltaic devices
… and photocarrier collection. Vertically aligned ZnO nanowire arrays can decouple absorption and collection by acting as highly-conductive channels for extracting photogenerated electrons from deep within the film. This thesis illustrates a scheme for the development of ordered bulk heterojunction …
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Investigation of doped ZnO by Molecular Beam Epitaxy for n- and p-type Conductivity
… especially the electrical properties, of doped ZnO films grown by plasma-assisted molecular beam epitaxy (MBE) under different conditions. The interest in investigating ZnO films is motivated by the potential of ZnO to replace the currently dominant ITO in industries as n-type transparent …
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Structural, electrical and optical properties of transparent conducting Si-doped ZnO thin films grown by pulsed laser deposition
Thin silicon doped zinc oxide films were ablated onto borosilicate glass substrates by pulsed laser deposition of a bulk ZnO target doped with 2 wt% silicon. The rotating target was irradiated at low ambient oxygen pressures by a KrF Excimer laser (Lambda physics LPX 300) emitting pulses of 0.18 ns …
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Hydrothermally grown Pb2+ doped ZnOnanorods for hydrogen and acetylene gas sensing
Randomly orientated ZnO nanorods were deposited hydrothermally on Si <100> wafers. The precursor solutions used for ZnO nanorods deposition were zinc chloride + aqueous ammonia and Zinc nitrate + HMT. ZnO nanorods were deposited on Si<100> wafers to establish the optimal PH and concentration which …
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Synthesis and characterization of metal oxide semiconductors for photoelectrochemical hydrogen production
… properties of metal-oxide thin films on fluorine-doped tin oxide (FTO)-coated glass substrates, prepared by using radio- frequency (RF) reactive magnetron sputtering for photoelectrochemical (PEC) applications. Metal-oxide thin films as a photoelectrode are of special interest for PEC systems to …
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Optimization of gadolinium-doped zinc oxide films for diluted magnetic semiconductor and its effects on organic solar cell performance
… new DMS. In this research, Gadolinium (Gd) was doped with Zinc Oxide (ZnO) to explore the feasibility of making new DMS. The Gd-doped ZnO (Zn1-xGdxO) was synthesized using the sol-gel spin coating technique. Parameters, such as the type of solvent, annealing environment and Gd contents, were …
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Luminescence in ZnO
… with a large binding energy (about 60meV), ZnO is a promising candidate semiconductor material for the next generation of optoelectronic , light emission or high power and high frequency devices. In order to make electrical device from ZnO, it is necessary to investigate optical properties …
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Design and Development of Sustainable, Low-Cost, High-Performance Nanomaterials for Thermoelectric and Solar Hydrogen Applications
… doping and deposition on fluorine doped tin oxide substrates were employed to partially decouple charge transport pathways, enabling enhanced Seebeck coefficients, reduce thermal conductivity while maintaining electrical conductivity. The materials were comprehensively …
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Metal oxide nanostructures and their applications
… and specific applications of two undoped and doped metal oxide nanostructures, i.e. zinc oxide (ZnO) and iron oxide (α-Fe2O3). The thesis highlights the development of novel synthesis techniques/procedures which are rapid, consume less energy and time, and are less cumbersome, more …
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Diluted Magnetic Semiconductor Nanomaterials Fabrication by a Chemical Vapor Deposition Method
… At 850 ºC, the most optimistic condition for ZnO crystal growth was obtained. At high reaction temperature 950ºC, Mn2+ were substitutionally doped into ZnO lattice, resulting in room-temperature ferromagnetic coupling with a saturated magnetization of 0.25emu/g. The ferromagnetic interaction …
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On the growth and characterisation of Zinc Oxide
Optical, electrical and structural properties of ZnO grown via grown via PLD and VPT were examined. Both growth techniques were successful in producing nanostructured ZnO with thin films also produced with PLD. An epitaxial relationship to the substrate was found for all materials. A …
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Process Dependence of Defects and Dopants in Wide Band Gap Semiconductor and Oxides
… semiconductors and oxides of high-k dielectrics, ZnO and MoS<sub>2 </sub>.</p><p>Ultrahigh speed microelectronics demands high mobility semiconductors such as Ge. We are exploring how to process high-k oxides on Ge to minimize defects that trap charge. For Ge doped HfO<sub>2</sub>, which has …
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Atomic layer deposition of metal oxides for photovoltaic applications
… cells. This thesis focuses on the deposition of ZnO and doped ZnO by atomic layer deposition (ALD), a scalable industry relevant technology, to replace ITO in tandem solar cells. To begin, a fundamental study of ZnO and its doped counterparts were deposited at the optimum temperature, 200⁰C and …
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Properties and sensor performance of zinc oxide thin films
Reactively sputtered ZnO thin film gas sensors were fabricated onto Si wafers. The atmosphere dependent electrical response of the ZnO micro arrays was examined. The effects of processing conditions on the properties and sensor performance of ZnO films were investigated. Using AFM, SEM, XRD and …
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Formation Mechanisms and Photocatalytic Properties of ZnO-Based Nanomaterials
Zinc Oxide (ZnO) is one of the most extensively studied semiconductors because of its unique properties, namely, its wide band gap (3.37 eV) and high excitation binding energy (60 meV). These properties make ZnO a promising material for uses in a broad range of applications including sensors, …
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Efficiency droop mitigation and quantum efficiency enhancement for nitride Light-Emitting Diodes
… light extraction efficiency including using Ga doped ZnO as the p-GaN contact layer to improve light extraction as well as current spreading was introduced.
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Diluted Magnetic Semiconductor Cobalt and Europium Implanted ZnO Thin Film
… for multifunctional spintronics devices. ZnO based semiconductors have been identified to be the promising room temperature ferromagnetic materials with a wide band-gap. However, the intrinsic room temperature ferromagnetic spintronics materials are still far to be optimized. In this …
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Alternative transparent electrodes for organic light emitting diodes
… as a replacement of ITO were studied. First, Al doped ZnO (ZnO:Al) which is composed of abundant materials was investigated with DC magnetron sputtering under a wide range of experimental conditions. The optimised ZnO:Al received comparable performance with conventional ITO films, low sheet …
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