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Title: Tunable electronic structure in dilute magnetic semiconductor Sr{sub 3}SnO/c-YSZ/Si (001) epitaxial heterostructures

We report a systematic study of the structural, physical, and chemical properties of epitaxial thin films of emerging dilute magnetic semiconductor (DMS) Sr{sub 3}SnO (SSO) integrated with Si (100) prepared by various post-growth annealing treatments. The transport properties of these films are primarily governed by oxygen vacancies and the results are explained with the variable-range hopping model. The increased oxygen vacancy concentration generated by post-growth vacuum annealing results in a shorter hopping distance and reduced hopping energy and Coulomb gap, leading to lower resistivity; oxygen annealing shows the opposite effects. The work function ranges from 4.54 to 4.02‚ÄČeV and shows a negative linear relationship with oxygen vacancy concentration, accompanied by a 0.42‚ÄČeV shift in the surface Fermi level. The transport and ultraviolet photoelectron spectroscopy probes agree quantitatively on measurement of the resistivity and surface electronic structure. The results provide a direct and consistent explanation that the property changes in the bulk and at the surface are primarily attributed to oxygen vacancies, which are believed to be the carriers in the SSO thin films. The ability to manipulate the work function and oxygen vacancy concentration in epitaxial DMS SSO thin films offers great potential for the development of spintronic devices.
Authors:
; ;  [1]
  1. Department of Materials Science and Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695-7907 (United States)
Publication Date:
OSTI Identifier:
22308200
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CHEMICAL PROPERTIES; ELECTRONIC STRUCTURE; EPITAXY; FERMI LEVEL; MAGNETIC SEMICONDUCTORS; OXYGEN COMPOUNDS; PHOTOELECTRON SPECTROSCOPY; PHYSICAL PROPERTIES; SILICON; STRONTIUM COMPOUNDS; SURFACES; THIN FILMS; TIN COMPOUNDS; ULTRAVIOLET RADIATION; WORK FUNCTIONS; YTTRIUM COMPOUNDS; ZIRCONIUM COMPOUNDS