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Seebauer, Edmund G. Seebauer, Edmund G. Yang, Hong Flaherty, David W. Ertekin, Elif Li, Ming 2017-03-01T17:01:33Z 2017-03-01T17:01:33Z 2019-03-02T10:15:14Z 2016-11-23 2016-12 The technological usefulness of a solid often depends upon the types and concentrations of the defects it contains. In semiconducting metal oxides like zinc oxide, the concentration and diffusion of oxygen point defects, like interstitials and vacancies, play a central role in various physical phenomena, such as gas sensing, bipolar switching, photoluminescence and photocatalysis. Defect engineering in metal oxides aims at manipulating material properties through controlling the defects’ type, concentration, charge, spatial distribution, and mobility. A specific challenge that inhibits performance improvement in metal oxide devices for microelectronics, photonics, and photocatalysis usages is that bulk oxygen vacancies (VO) are typically numerous and serve as carrier recombination centers or electron current scatterers. One solution suggested by our laboratory is to thermally inject highly mobile charged oxygen interstitials (Oi) through metal oxide surfaces from the gas phase to annihilate VO in the underlying bulk. Developing novel mechanisms to control such diffusion process would be crucial in tailoring material defect chemistry for real life applications. The present work demostrates two special surface-based control mechanisms for this purpose in the case of zinc oxide: near-surface electrostatics and the chemical state of surface active sites. Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-12-01 The student, Ming Li, accepted the attached license on 2016-11-22 at 20:12. The student, Ming Li, submitted this Dissertation for approval on 2016-11-22 at 20:27. This Dissertation was approved for publication on 2016-11-23 at 13:24. DSpace SAF Submission Ingestion Package generated from Vireo submission #10302 on 2017-02-28 at 14:42:01 Made available in DSpace on 2017-03-01T17:01:33Z (GMT). No. of bitstreams: 2 LI-DISSERTATION-2016.pdf: 12743607 bytes, checksum: ce9f4fe7b291b2ecef7458f3a4a5eb39 (MD5) LICENSE.txt: 4204 bytes, checksum: 305984cb3411c1dd7092050709f1c24a (MD5) Previous issue date: 2016-11-23 Embargo set by: Seth Robbins for item 98701 Lift date: 2019-03-01T17:02:22Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 98701 Lift date: 2019-03-01T17:03:32Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 98701 Lift date: 2019-03-01T17:05:02Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 98701 Lift date: 2019-03-01T17:06:55Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Limited Restriction Lifted for Item 98701 on 2019-03-02T10:15:14Z. application/pdf http://hdl.handle.net/2142/95585 en Copyright 2016 Ming Li Defect engineering Surface science Metal oxides Zinc oxide Oxygen interstitial Oxygen diffusion Isotope gas-solid exchange Surface-mediated mechanisms for defect engineering in zinc oxide text text Chemical & Biomolecular Engr Chemical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.