Growth and Characterization of ZnO and ZnO-Based Alloys MgxZn1-xO and MnxZn1-xO

Simple item page
dc.contributor.advisorRobert M. Kolbas, Committee Memberen_US
dc.contributor.advisorCarl C. Koch, Committee Memberen_US
dc.contributor.advisorJagdish Narayan, Committee Chairen_US
dc.contributor.advisorRonald O. Scattergood, Committee Memberen_US
dc.contributor.authorJin, Chunmingen_US
dc.date.accessioned2010-04-02T19:14:54Z
dc.date.available2010-04-02T19:14:54Z
dc.date.issued2004-11-19en_US
dc.degree.disciplineMaterials Science and Engineeringen_US
dc.degree.leveldissertationen_US
dc.degree.namePhDen_US
dc.descriptionNorth Carolina State University Theses Materials Science and Engineering.
dc.description.abstractThe goals of this work were to synthesize ZnO and ZnO based alloy thin films by using PLD and to study the structural, stoichiometric, optical and electrical properties of these films. Epitaxial hexagonal MgZnO thin films have been grown on sapphire (0001) with domain-matching epitaxy by using PLD. The films show the high single-crystalline quality and bright excitonic luminescence. The maximum Mg concentration was found to be 34 at. %, which is almost ten times of the value allowed by the phase diagram. The bandgap of MgZnO alloy film can be tuned from 3.40 eV to 4.19 eV. Epitaxial ZnMgO thin films with cubic (NaCl) structure were also synthesized on MgO (001) sapphire (0001) and TiN/Si(001) by using PLD. The maximum Zn concentration in these cubic alloy films was 18 at. %. The epitaxial growth of cubic ZnMgO on Si(001) substrate is of significant importance for integrating ZnO-based alloys to the Si-based electronics. The phase stability of MgZnO/ZnO/MgZnO superlattice structures was studied using XRD and HRTEM methods. The diffusion of Mg from the MgZnO barrier to the ZnO well was observed by using the HRTEM and optical measurements. The cubic nanoinclusions were also observed with HRTEM. Epitaxial MnZnO thin films were synthesized on sapphire (0001) substrates. The maximum Mn concentration was 35 at. %. The bandgap of these films shifts to the higher energy side with increasing Mn content. Magnetic investigations indicate that these films are paramagnetic. Epitaxial ZnO films have been grown on Si (111) substrates by using PLD with two different heterostructures, ZnO/AlN/Si(111) and ZnO/MgO/TiN/Si(111). These thin films show the excellent single crystalline quality and extremely bright excitonic emission. C-axis orientated ZnO thin films have been grown on the amorphous silica substrates. The PL characteristics of these films are comparable to that of the films grown on the sapphire substrates. An ultraviolet illumination-enhanced luminescence effect was observed. This new phenomenon is attributed to the oxygen desorption on the surface. A phenomenological model was proposed to explain this new effect.en_US
dc.formatThesis (Ph.D.)--North Carolina State University.
dc.identifier.otheretd-11192003-120914en_US
dc.identifier.urihttp://www.lib.ncsu.edu/resolver/1840.16/5498
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectepitaxial growthen_US
dc.subjectZnO thin filmen_US
dc.subjectpulsed laser depositionen_US
dc.subjectcubic phase ZnMgO thin filmen_US
dc.subjectMnZnO thin filmen_US
dc.subjectMgZnO thin filmen_US
dc.titleGrowth and Characterization of ZnO and ZnO-Based Alloys MgxZn1-xO and MnxZn1-xOen_US
dcterms.abstractKeywords: epitaxial growth, ZnO thin film, pulsed laser deposition, cubic phase ZnMgO thin film, MnZnO thin film, MgZnO thin film.
dcterms.extentxix, 223 pages : illustrations (some color)

Files

Original bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
etd.pdf
Size:
7.46 MB
Format:
Adobe Portable Document Format
Download

Collections

Dissertations