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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 65 for “"Single-crystal silicon"”.
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A variable capacitor made from single crystal silicon fracture surface pairs
Complementary and nano-smooth single-crystal-silicon surfaces have been fabricated by deliberately fracturing a weakened portion of a larger structure whose flexural mechanism refines and concentrates an externally applied load to a notched specimen region pre-.fracture and acts as a precision …
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Anisotropic dewetting in ultra-thin single-crystal silicon-on-insulator films
The single crystal silicon-on-insulator thin film materials system represents both an ideal model system for the study of anisotropic thin film dewetting as well as a technologically important system for the development of the next generation of MOSFET devices. The scientific community has …
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Thermomechanical behavior of single crystal silicon microbeams under bending at elevated temperatures
… of electronic and mechanical devices. Silicon is the most commonly used material in these devices. Bulk silicon is brittle at room temperature, but is ductile at 550 ºC - a phenomenon known as brittle-to-ductile transition (BDT). Recently, there has been a speculation in the literature …
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A study of beryllium and beryllium-lithium complexes in single-crystal silicon
When beryllium is thermally diffused into silicon, it gives rise to acceptor levels 191 meV and 145 meV above the valence band. Quenching and annealing studies indicate that the 145 meV level is due to a more complex beryllium configuration than the 191 meV level. When lithium is thermally diffused …
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A miniaturized single crystal silicon solar cell array for a MEMS power source
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Decreasing Size, Weight, and Power of Opto-Mechanical Assemblies Using Single-Crystal Silicon
… While often used as an optical substrate, single-crystal silicon (SCSi) is not typically thought of as a structural material. However, it has excellent opto-mechanical properties such as a high stiffness to weight ratio, a low coefficient of thermal expansion, and high thermal conductivity. …
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Thermal ionization energy of lithium and lithium-oxygen complexes in single-crystal silicon
… ionization energy of lithium as an impurity in single-crystal silicon has recently been determined by optical means to be dependent upon the amount of oxygen in the silicon. It was found that for float-zone crystals, having a relatively low oxygen content (less than 10¹⁶ cm⁻³), the ionization …
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Experimental investigation of the brittle to ductile transition in fracture of single crystal silicon
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Multi-paradigm modeling of mode I&II dynamic fracture mechanisms in single crystal silicon
In addition to its semi-conducting properties, silicon has the ability to be manipulated with high precision at very small length- scales. This property makes it very useful in the design of Nano/Micro-Electromechanical Systems (N/MEMS) and similar technologies. The understanding of fracture of …
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Creep characterization of single crystal silicon in support of the MIT Micro-Engine Project
… the first engine to test will be constructed of single-crystal silicon. Due to its low brittle-to-ductile transition temperature, silicon is not ideal for a production engine. However, the microfabrication technology for silicon is far more advanced than other candidate materials making it the …
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Single crystal silicon as a macro-world structural material : application to compact, lightweight high pressure vessels
Single crystal silicon has promising inherent structural properties which are attractive for weight sensitive applications. Single crystal silicon, however, is a brittle material which makes the usable strength that can be obtained from silicon devices dependent on flaws or cracks that can arise …
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An optical study of lithium and lithium-oxygen complexes as donor impurities in single crystal silicon
… two parts; first we discuss the lithium donor in silicon, and later the lithium-oxygen interaction in silicon. We present here a discussion of information which is common to both aspects of the problem. The data is presented in the form of absorption spectra in which the absorption coefficients …
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Switched-Tank VCO Designs and Single Crystal Silicon Contour-Mode Disk Resonators for use in Multiband Radio Frequency Sources
… with high-Q off-chip components such as quartz crystal references and surface acoustic wave (SAW) resonators in a PLL can exhibit much improved performance; however, these off-chip components add packaging/assembly cost and higher bill of materials, impedance matching issues, and parasitics that …
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A tip-tilt-piston micromirror with elastomeric universal joint fabricated via micro-masonry
… actuation. The micromirror involves a single crystal silicon mirror and a conductive elastomeric universal joint which are mechanically bonded and electrically interconnected. This device takes advantage of two distinct materials to achieve a high quality reflective surface using single …
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Experimental Studies of Laterally Seeded Recrystallized Polysilicon on Silicon Dioxide
Single crystal silicon films have been grown on silicon dioxide covered silicon substrates by lateral epitaxy by seeded solidification using a scanned graphite strip heater.
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Thermoelectric properties of polysilicon inverse opals
Nanostructured single-crystal silicon exhibits a remarkable increase in the gure of merit for thermoelectric energy conversion. Here we theoretically and experimentally(partial) investigate a similar enhancement for polycrystalline silicon structured as an inverse opal. An inverse opal provides …
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A Novel Method for Testing Freestanding Nanofilms Using a Custom MEMS Load Cell
… the apparatus, including membranes of gold, single crystal silicon, and nano-porous silicon. The elastic properties of both the gold and silicon agree with previous measurements. Interesting new behavior for each material was also observed, including a surface energy driven creep relaxation …
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Investigation of Fluorescence and Fluorescence Polarization as a Probe of Surface-Bound Species (Zinc Tetraphenylporphyrin, Ruthenium Tris(bipyridine))
… tris(bipyridine) were deposited onto glass, single crystal silicon and electrodes of indium oxide coated glass, pyrolytic graphite and thin gold films. Deposition was accomplished by (a) drying an aliquot of solution that had been loaded by syringe, (b) dipcoating from solution, (c) …
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Recombination lifetime analysis of deep levels in silicon
By the addition of selected impurities to silicon it is possible to affect its physical, optical and electrical properties to a remarkable extent. Of great technological importance are the elements of groups III and V which introduce shallow acceptor and donor levels and control the equilibrium …
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