Tunable electronic structure in dilute magnetic semiconductor Sr3SnO/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) Sr3SnO (SSO) integrated with Si (100) prepared by various post-growth annealing treatments. The transport properties of these films are primarily...

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Bibliographic Details
Published in:Journal of applied physics 2014-10, Vol.116 (16)
Main Authors: Lee, Y. F., Narayan, J., Schwartz, J.
Format: Article
Language:English
Subjects:
Annealing
Applied physics
Chemical properties
Dilution
Electrical resistivity
Electronic structure
Electrons
Epitaxy
Fermi surfaces
Heterostructures
Magnetic properties
Magnetic semiconductors
Organic chemistry
Oxygen
Thin films
Transport properties
Vacancies
Vacuum annealing
Work functions
Yttria-stabilized zirconia
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Summary:We report a systematic study of the structural, physical, and chemical properties of epitaxial thin films of emerging dilute magnetic semiconductor (DMS) Sr3SnO (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 eV and shows a negative linear relationship with oxygen vacancy concentration, accompanied by a 0.42 eV 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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4899438