Theses and Dissertations from UMD

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

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Author: search.filters.author.Ku, Ching-EnSubject: search.filters.subject.Atomic layer deposition

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    ATOMIC LAYER DEPOSITION OF NICKEL THIN FILMS FOR SPACECRAFT OPTICAL APPLICATIONS
    (2020) Ku, Ching-En; Adomaitis, Raymond A.; Chemical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Two approaches for Ni Atomic Layer Deposition on glass substrates have been studied for spacecraft optical applications. The first strategy is to first deposit a NiO thin film and then reduce the metal oxide film using noble gas under high temperature. NiCp2 and O3 as the precursors were chosen due to the low-temperature required for deposition and high growth rate. An alternative pathway was to deposit a Ru metallic film as the adsorption layer, using Ru(DMBD)(CO)3 and H2O, then deposit the Ni metallic film on the Ru film using Ni(DAD)2 and tert-butylamine. The reaction mechanisms for both processes were developed. The ideal theoretical growth rates of these ALD processes were calculated as 2.40 Å/cycle for NiO, 2.19 Å/cycle for Ru and 2.04 Å/cycle for Ni metallic film.