Graduate Thesis Or Dissertation
 

Growth and characterization of wide–gap semiconducting oxide and chalcogenide thin films by pulsed laser deposition

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w0892d92h

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  • The preparation and characterization of thin film oxides and chalcogenides by pulsed laser deposition (PLD) is presented. An overview of fundamental PLD concepts are presented and are followed by a description implementation and development of the PLD systems at OSU. We present the results of thin film growth of high electron mobility In₂O₃:W in which we have prepared films exhibiting µ > 100 cm²/Vs on vitreous SiO₂ substrates. The growth of Cu₃TaCh₄ (Ch = S, Se) films is outlined as a two step process consisting of PLD of ceramic targets followed by ex-situ annealing in chalcogenide vapor. Also, BiCuOSe thin films have been prepared in-situ and exhibit a high hole mobility up to 4 cm²/Vs. A discussion of their electronic structure is presented which explains the nature of the low band gap energy on the basis of deep Bi 6p level at the conduction band minimum. Finally, the results of BaBiO₃ thin film preparation are presented in which both polycrystalline and highly (00l) oriented samples were grown.
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file details Newhouse_PhD_dissertation.pdf 2017-08-14 Pubblico Scaricare