C
Claire A. Johnson
Researcher at University of Washington
Publications - 6
Citations - 306
Claire A. Johnson is an academic researcher from University of Washington. The author has contributed to research in topics: Band gap & Doping. The author has an hindex of 6, co-authored 6 publications receiving 295 citations. Previous affiliations of Claire A. Johnson include Tulane University.
Papers
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Journal ArticleDOI
Lack of ferromagnetism in n-type cobalt-doped ZnO epitaxial thin films
Tiffany C. Kaspar,Timothy C. Droubay,Steve M. Heald,Ponnusamy Nachimuthu,Chong M. Wang,Vaithiyalingam Shutthanandan,Claire A. Johnson,Daniel R. Gamelin,Scott A. Chambers +8 more
TL;DR: In this article, a cobalt-doped ZnO thin film was deposited by pulsed laser deposition (PLD) on both c-plane and rplane sapphire (Al2 O3).
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Correlated substitution in paramagnetic Mn 2 + -doped ZnO epitaxial films
Timothy C. Droubay,David Keavney,Tiffany C. Kaspar,Steve M. Heald,Chong M. Wang,Claire A. Johnson,K. M. Whitaker,Daniel R. Gamelin,Scott A. Chambers +8 more
TL;DR: Using x-ray absorption spectroscopy and magnetic circular dichroism, the authors found that Mn(II) was found to substitute for Zn(II), with only a paramagnetic dichroic component from the Mn and no magnetic component from either the O or Zn.
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Visible-light photoconductivity of Zn 1-x Co x O and its dependence on Co 2+ concentration
Claire A. Johnson,Alicia W. Cohn,Tiffany C. Kaspar,Scott A. Chambers,G. Mackay Salley,G. Mackay Salley,Daniel R. Gamelin +6 more
TL;DR: In this article, a detailed photoconductivity investigation of the wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO), which responds to visible light in photoelectrochemical and photoconductivities experiments and thus represents a well-defined model system for understanding dopant-sensitized oxides is presented.
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Mid-Gap Electronic States in Zn1-xMnxO.
Claire A. Johnson,Kevin R. Kittilstved,Tiffany C. Kaspar,Timothy C. Droubay,Scott A. Chambers,G. Mackay Salley,G. Mackay Salley,Daniel R. Gamelin +7 more
TL;DR: In this article, electron absorption, magnetic circular dichroism (MCD), photoconductivity, and valence-band x-ray photoelectron (XPS) spectroscopic measurements were performed on epitaxial ZnO films to investigate the origin of the mid-gap band that appears upon introduction of the ZnNO lattice.
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Sub-band-gap photoconductivity in Co 2 + -doped ZnO
Claire A. Johnson,Tiffany C. Kaspar,Scott A. Chambers,G. Mackay Salley,G. Mackay Salley,Daniel R. Gamelin +5 more
TL;DR: In this paper, low-temperature (27 K) measurements demonstrate spontaneous ionization from the photogenerated epitaxial films of the donor-type photoionization process, despite the highly localized nature of this excitation.