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 89 for “"Defect Density"”.
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Reduced Defect Density Nalgan Template Layer for Improved Output Deep-UV LED
… to an estimated 90% reduction in dislocation density. Conductivity and transparency were also improved, by 20% and 15% respectively.</p>
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Empirical correlation of minority carrier lifetime to detect density profile in germanium on silicon heteroepitaxy
… mismatch between Ge and Si often leads to a high density of defects which can propagate through any III-V material grown subsequently. Introducing annealing steps prior to and after full Ge island coalescence are found to reduce the defect density. It has been observed that the defect density in …
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Mesoscale simulation of block copolymer phase separation and directed self-assembly processes: Applications for semiconductor manufacturing
… copolymer properties have on line roughness and defect density in a BCP-DSA process. These two effects are perhaps the most critical in making BCP-DSA a cost efficient industrial process. It is found that guiding patterns have little effect on line roughness and in fact that the BCP heals the …
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System design and the cost of architectural complexity
… and Rusnak. Significant cost drivers including defect density, developer productivity, and staff turnover were measured as well. The link between cost and complexity was explored using a variety of statistical techniques. Within this research setting, we found that differences in architectural …
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Quantitative non-destructive study of sub-micron defects in very large scale integrated-circuit silicon using transmitted and reflected infra-red laser scattering
… Profiler (OPP) to detect oxygen precipitate defects in silicon were investigated. Two sets of specimens were made and studied. One set had wafers containing the same bulk defect density, but had different precipitate growth thermal treatments. These treatments resulted in defects of different …
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Basics of detached Bridgman growth of Ge1-xSix crystals
… resulting in a better crystal quality with less defect density. <br>High contact angles and high growth angles favor crystal detachment. Therefore, the knowledge of the contact angle is essential for choosing an appropriate ampoule material. Contact angles of Ge and Ge1-xSix (with Si …
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Lattice Engineering of III-Nitride Heterostructures and Their Applications
… such as lack of native substrates, and high defect density have to be overcome for further development of III-Nitride technology. This work presents research on lattice engineering of III-Nitride materials, and the structural, optical, and electrical properties of its alloys, in order to …
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Structural defect engineering of tin (II) sulfide thin films for photovoltaics
… In this work, I assess the impact of structural defects and anisotropy on the minority-carrier lifetime and other key device parameters, shedding light on the path to high-efficiency SnS-based photovoltaics. SnS thin films are deposited by thermal evaporation in a range of growth temperatures …
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Novel Reactions on Halogen -Terminated Si(100)
… as a dark spot in the center of the dimer. The density of these ""split dimer"" defects correlated with the c-type defect density on the clean surface. These results also showed how to produce nearly defect free halogen-terminated Si(100)."
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Electrochemical Behavior of Carbon Nanostructured Electrodes: Graphene, Carbon Nanotubes, and Nanocrystalline Diamond
… was developed to evaluate the energy and power density of individual electrodes. This facilitated comparison of a variety of electrode materials without having to first develop complex device packaging schemes. It was found that smaller pore size and higher density of carbon foliates on a …
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Non-lithographic and scalable manufacturing of silicon micro & nanomaterials
… RMS < 5 nm), high-aspect ratio (i.e. >20), low-defect density (i.e. no porous formation), and large-area patterning (>1 cm2). In each of these approaches, a fundamental understanding of ionic diffusion, reaction kinetics, and nucleation dynamics are directly correlated to manufacturing outputs - …
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Fabrication and characterization of germanium-on-silicon photodiodes
… current. It was also found that threading defects play a role in leakage current. Threading defects arise because of the 4% lattice mismatch between germanium and the underlying silicon. For 1 jim-thick germanium films, as-grown samples are expected to have -5 x 108 cm- 2 threading defects. …
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Evaluation of tests for porosity and defects in PVD and electroless coatings.
… on mild steel investigated but only macrodefects could be observed. With the help of the SO[2] test the origin of defects in electroless nickel coatings was examined using SEM techniques. Furthermore the test was used to observe the formation of corrosion products at defect sites as a …
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Growth defects in CrN/NbN coatings deposited by HIPIMS/UBM techniques
… imperfections even though the overall number of defects can be significantly lower compared to, for example, arc deposited coatings of similar thickness. Defects can degrade the coating performance thus any kind of defect is undesirable. To better understand the nature of these imperfections and …
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Understanding the Structure and Properties of Self-Assembled Monolayers for Interfacial Patterning
This dissertation describes the impact of defects on monolayer properties for self-assembled monolayers (SAMs) created by interfacial patterning methods. When forming a two-dimensional interfacial pattern with n-alkanethiols on gold, the desired electrochemical properties are those of a …
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Addressing equipment set-up time and manufacturing cost through real time inline inspection in tantalum wire manufacturing
… system was developed to detect surface defects and monitor diameter real-time during the final wire drawing operation. Throughout his work, it was proven that the new inspection system was able to catch common wire defects under manufacturing conditions (wire speed). Furthermore, defect …
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Quantitative photoluminescence studies in a-Si:H/c-Si solar cells
… analyzed. The results show that the interface defect density Dif in a-Si:H/c-Si heterojunctions strongly influences EFn-EFp. The comparison of EFn-EFp from PL with simulation allows the extraction of parameters for the interface. Tau eff,pl increases with temperatures T while PL yield …
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Synthesis of III-V nitride nanowires with controlled structure, morphology, and composition
… over nanowire orientation, morphology, and defect density. Substrate orientation was used to control whether nanowires grew preferentially in the polar [0001] direction or the nonpolar [1-100] direction. Film deposition on the nanowire sidewalls was effectively minimized by reducing the Ga …
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Design, growth and optimization of 2-μm InGaSb/AlGaSb quantum well based VECSELs on GaAs/AlGaAs DBRs.
… is therefore to reduce the threading dislocation density in the active region without a very thick metamorphic bu\u21b5er and this is achieved by inducing 90! interfacial misfit dislocation arrays between the GaSb and GaAs layers. In this work cross section transmission electron microscopy is used …
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