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    Spectroscopy and control of near-surface defects in conductive thin film ZnO

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    Name:
    Kelly_ZnO_TPPE_Defects_Rev.1.pdf
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    1.323Mb
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    PDF
    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Kelly, Leah L
    Racke, David A
    Schulz, Philip
    Li, Hong cc
    Winget, Paul
    Kim, Hyungchul
    Ndione, Paul
    Sigdel, Ajaya K
    Bredas, Jean-Luc cc
    Berry, Joseph J
    Graham, Samuel
    Monti, Oliver L A
    KAUST Department
    KAUST Solar Center (KSC)
    Laboratory for Computational and Theoretical Chemistry of Advanced Materials
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-02-12
    Online Publication Date
    2016-02-12
    Print Publication Date
    2016-03-09
    Permanent link to this record
    http://hdl.handle.net/10754/607208
    
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    Abstract
    The electronic structure of inorganic semiconductor interfaces functionalized with extended π-conjugated organic molecules can be strongly influenced by localized gap states or point defects, often present at low concentrations and hard to identify spectroscopically. At the same time, in transparent conductive oxides such as ZnO, the presence of these gap states conveys the desirable high conductivity necessary for function as electron-selective interlayer or electron collection electrode in organic optoelectronic devices. Here, we report on the direct spectroscopic detection of a donor state within the band gap of highly conductive zinc oxide by two-photon photoemission spectroscopy. We show that adsorption of the prototypical organic acceptor C60 quenches this state by ground-state charge transfer, with immediate consequences on the interfacial energy level alignment. Comparison with computational results suggests the identity of the gap state as a near-surface-confined oxygen vacancy.
    Citation
    Spectroscopy and control of near-surface defects in conductive thin film ZnO 2016, 28 (9):094007 Journal of Physics: Condensed Matter
    Sponsors
    This work was supported as part of the Center for Interface Science: Solar Electric Materials (CISSEM), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award Number DE-SC0001084.
    Publisher
    IOP Publishing
    Journal
    Journal of Physics: Condensed Matter
    DOI
    10.1088/0953-8984/28/9/094007
    Additional Links
    http://stacks.iop.org/0953-8984/28/i=9/a=094007?key=crossref.f23aa26cd74fc8e4fb3da44c0fd1fc35
    ae974a485f413a2113503eed53cd6c53
    10.1088/0953-8984/28/9/094007
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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