• Login
    View Item 
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Interfaces in organic electronic devices: Surface characterization and modification and their effect on microstructure in molecular assemblies

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    azu_td_3108897_sip1_m.pdf
    Size:
    7.018Mb
    Format:
    PDF
    Download
    Author
    Donley, Carrie Lynn
    Issue Date
    2003
    Keywords
    Chemistry, Analytical.
    Advisor
    Armstrong, Neal R.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    This dissertation has focused on (i) the characterization and optimization of the near-surface region of indium-tin oxide (ITO) thin films, and (ii) the characterization of the microstructure and electrical properties of thin films of several new self-organizing liquid crystalline phthalocyanines (Pcs). Commercial ITO surfaces were explored through a combination of high resolution X-ray photoelectron spectroscopy and electrochemical techniques. It was determined that sputter-deposited ITO films undergo hydrolysis immediately upon exposure to atmosphere, creating InOOH and In(OH)₃ species, which appear to inhibit charge transfer reactions. The surface coverage of these InOOH and In(OH)₃-like species can be controlled by various solution and vacuum pretreatments, including etching with EDTA solutions, and RF-plasmas. Characterization of new discotic mesophase Pc materials has focused on modifications of the original Pc in this series, CuPc(OCH₂CH₂OBz)₈, including a polymerizable version, CuPc(OCH₂CH₂OCH₂CH=CH-Ph)₈, and the sulfur analogs of these molecules, CuPc(SCH₂CH₂OBz)₈ and CuPc(SCH₂CH₂OCH₂CH=CH-Ph)₈. The self-organizing properties of these new Pcs are altered by the changes in side chain composition, but still show the same "column-forming" tendencies as the parent Pc, with long range order. The polymerizable Pc materials can be photolithographically patterned with features as small as 2 microns. Electrical anisotropies in these films were measured with a conductive tip AFM and with OFETs, and anisotropies in current (j(∥)/j(⊥)) were ca. 10 on the micron scale, and up to 1000 on the submicron scale. OFET measurements showed low hole mobilities, which are attributed to poor contact between the Pc column and the Au electrodes. Chemical modification of these electrodes shows that considerable improvements in OFET performance result from this modification strategy. Understanding and controlling the microscopic structure of these Pc films is important for optimizing their electrical properties. A considerable effort was focused on developing a quantitative protocol to combine transmission and reflectance vibrational spectroscopic data to determine the three Euler angles that determine the orientation of these Pcs in an LB-deposited film on a planar substrate. Changes in orientation upon annealing and polymerization were observed, but in general these molecules display tilt angles away from the surface normal of <20° and twists about the surface normal of ca. 25°.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Chemistry
    Degree Grantor
    University of Arizona
    Collections
    Dissertations

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.