Electrical and material properties of hydrothermally grown single crystal (111) UO2

Christina L. Dugan, George Glenn Peterson, Alyssa Mock, Christopher Young, J. Matthew Mann, Michael Nastasi, Mathias Schubert, Lu Wang, Wai Ning Mei, Iori Tanabe, Peter A. Dowben, James Petrosky

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The semiconductor and optical properties of UO2 are investigated. The very long drift carrier lifetimes, obtained from current–voltage I(V) and capacitance–voltage C(V) measurements, along with the well-defined optical properties provide little evidence of an abundance of material defects away from the surface region. Schottky barrier formation may be possible, but very much dependent on the choice of contact and surface stoichiometry and we find that Ohmic contacts are in fact favored. Depth resolved photoemission provided evidence of a chemical shift at the surface. Density functional theory, with the Heyd-Scuseria-Ernzerhof (HSE) functional, indicates a band gap of a 2.19 eV and an anti-ferromagnetic ground state. Ellipsometry measurements indicates at UO2 is relatively isotropic with a band gap of approximately 2.0 eV band gap, consistent with theoretical expectations.

Original languageEnglish (US)
Article number67
JournalEuropean Physical Journal B
Volume91
Issue number4
DOIs
StatePublished - Apr 1 2018

Keywords

  • Solid State and Materials

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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