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 347 for “"wafers"”.
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Precision passive alignment of wafers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Spatial yield modeling for semiconductor wafers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Fracture Resistance of Coated Polycrystalline Silicon Wafers
… units in the solar energy devices are silicon wafers in both single- and poly-crystalline forms. Their inherent defects and brittleness, however, impair their performance and reliability and can lead to premature fracture. This becomes important in applications in which silicon-based devices …
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Designing a mechanism to cleave silicon wafers
… and manufactured to precisely cleave silicon wafers. Two vacuum chucks were designed to support a 150 mm diameter silicon wafer and cleave it by providing a pure moment at a pre-etched v-notch while a vacuum was created on either side of the cut. The design of the vacuum chucks would also …
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Nondestructive photoelastic characterization of monocrystalline silicon photovoltaic wafers
Silicon wafers produced for the photovoltaic industry are becoming thinner. This renders the wafers more susceptible to bow under thermal residual and wafer handling stresses. Furthermore, a saw damage layer exists on the top and bottom surface of each wafer as a result of slicing the silicon ingot …
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Emissivity of patterned silicon wafers in rapid thermal processing
… influence of patterns on emissivity in silicon wafers in rapid thermal processing systems has been investigated. In this study, two experiments with layered and patterned silicon wafers were conducted. The main difference in the experiments is the way in which the temperature was controlled. The …
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Characterization of silicon photovoltaic wafers using polarized infrared imaging
… for mono-crystal and multi-crystal silicon PV wafers, using an integrated polarized infrared imaging tool capable of both photoelastic (PE) and polarized photoluminescence (PL) imaging. Infrared PE imaging is used to investigate the thermal process-induced residual stress and defect-related …
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Geometry control of recrystallized silicon wafers for solar applications
The cost of manufacturing crystalline silicon wafers for use in solar cells can be reduced by eliminating the waste streams caused by sawing ingots into individual wafers. Professor Emanuel Sachs has developed a new method of manufacturing silicon wafers that consists of first, rapidly creating a …
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Advanced Characterization of Defects in Silicon Wafers and Solar Cells
… properties of bulk defects in silicon wafers is essential for further improvement of performance and stability of silicon solar cells. This thesis focuses on the characterization of the electrical properties of bulk defects in silicon. Injection dependent lifetime spectroscopy, a …
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Characteristics of nanocomposites and semiconductor heterostructure wafers using THz spectroscopy
… and Si_{1-x}Ge_x HFO_2, SiO_2 on p-type Si wafers. For the nanoscale composite materials, Visible Pump/THz Probe spectroscopy measurements were performed after observing that the samples were not sensitive to the THz radiation alone. The results suggest that the photoexcited nanotubes …
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Fluidic Flexible Matrix Composite Wafers for Volume Management in Prosthetic Sockets
… this research, fluidic flexible matrix composite wafers (f2mc) are integrated into the prosthetic socket for volume regulation. The f2mc's are flexible tubular elements embedded in a flexible matrix. These tubular elements are connected to a reservoir, and contain an internal fluid such as air or …
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Characterization of residual stresses in birefringent materials applied to multicrystalline silicon wafers
… of residual stresses in multicrystalline silicon wafers using near-infrared (NIR) transmission photoelasticity. NIR transmission through multicrystalline silicon is found to vary with crystallographic orientation and relate to planar atomic density, enabling the assignment of appropriate …
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Influence of design and coatings on the mechanical reliability of semiconductor wafers.
… some of the mechanical design factors of wafers and the effect on strength. Thin, solid, pre-stressed films are proposed as a means to improve the bulk mechanical properties of a wafer. Three-point bending was used to evaluate the laser scribe density and chemical processing effect on …
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Antimicrobial wafers as a novel technology for infection control in chronic wounds.
… healing. Lyophilised, biopolymeric antimicrobial wafers can offer a contemporary, user-friendly, self-adhesive and effective approach for the management of suppuration and polybacterial contamination in a wide range of non-healing wounds. Cohesive, non-friable, porous, disc shape wafers were …
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Temperature-dependent yield properties of passivated aluminum thin films on silicon wafers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Methods of improving the surface flatness of thin glass sheets and silicon wafers
The manufacturing of high quality sheet glass has allowed for many technologies to advance to astonishing frontiers. With dimensions reaching ~ 3 x 3 m², sheet glass is pushing the envelope for producing massive size flat panel displays that can be hung on walls like paintings. Many other …
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Understanding the effects of larger wafers on the global semiconductor equipment supply chain
This thesis examines how an investment in 450mm wafers might affect capital equipment suppliers in the semiconductor industry and assesses if the 450mm transition is in the industry's best interest. The 450mm transition is currently scheduled for 2012 by the ITRS (International Technology Roadmap …
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Sacrificial high-temperature phosphorus diffusion gettering for lifetime improvement of multicrystalline silicon wafers
… [1]. For cost-effective multicrystalline silicon wafers, achieving this lifetime often requires gettering. Gettering at higher temperatures for longer times is often necessary to fully dissolve and remove precipitated impurities. However, such time temperature profiles can result in unacceptably …
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Formulation and physico-chemical characterisation of novel films and wafers for mucosal drug delivery
… of solvent cast films and freeze-dried wafers for the potential delivery of drugs via the buccal mucosa. The formulations were prepared from two polymers (κ-carrageenan (CAR) 911 and poloxamer 407 (P407)), two types of plasticizers (glycerol (GLY)) and various grades of polyethylene …
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CONTROL OF CAVITATION USING DISSOLVED CARBON DIOXIDE FOR DAMAGE-FREE MEGASONIC CLEANING OF WAFERS
… in the semiconductor industry for cleaning of wafers. Recently however, advancing technology and miniaturization has made wafer features increasingly susceptible to damage by megasonic energy. International Technology Roadmap for Semiconductors (ITRS) 2011 predicts the critical particle …
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