Browsing by Author "Doland, Charles Michael"
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Item Molybdenum silicide formation on single crystal, polycrystalline and amorphous silicon : growth, structure and electrical properties(1988) Doland, Charles Michael; Gorman, Michael A.; Moss, Simon C.; Kiehn, Robert Mitchell; Wood, Lowell T.; Rabalais, J. WayneThe solid state reactions which may occur between a thin metal film and a silicon substrate are of both scientific and technological interest. The initial interactions are poorly understood, yet the final state may critically depend on the initial interactions. In particular, although approximate rules have been proposed to predict the first phase formed in a metal silicon reaction, these rules are primarily based on bulk properties and are not always correct. In this work, the reaction of thin molybdenum films on silicon substrates was studied, with an emphasis on the initial interdiffusion and the nucleation of the crystalline silicide phase. The effects of contaminants and differing substrate crystallinity on the reactions were also investigated. Earlier research in this area has indicated that unintended contamination or film heating may have a profound effect on the results, so our research was carried out on samples produced and annealed in an ultrahigh vacuum (UHV) system. Raman scattering is a direct probe of the phonon structure of a solid, which reflects the underlying crystal structure, and it was used as a probe of the structure of the silicide phases formed in this study. Previous work has shown that in situ Raman scattering is an invaluable tool for the study of thin film solid state reactions since it can be applied with minimum disturbance to the sample. In addition to Raman scattering. Auger electron spectroscopy and low energy electron diffraction measurements were made on the samples in UHV. After removal from the UHV system, the samples were examined using electron microscopy. The electronic structure of the silicide-silicon interface was characterized by Schottky barrier height measurements. The effects of substrate crystallinity were investigated by carrying out similar experiments using amorphous, polycrystalline, and single crystal substrates. [...]Item The structure and optical properties of gold black--a good solar radiation absorber(1977) Doland, Charles Michael; Ignatiev, Alex; Wood, Lowell T.; Vant-Hull, Lorin L.; Rabalais, J. WayneSamples of gold black were prepared under a variety of conditions. The structural and optical properties of the gold blacks were measured and are compared to the Drude theory. The properties of the gold blacks are also correlated to the conditions of preparation of the gold black samples.