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Title: Band gap tuning of epitaxial SrTiO{sub 3-δ}/Si(001) thin films through strain engineering

We investigate the effect of strain and oxygen vacancies (V{sub O}) on the crystal and optical properties of oxygen deficient, ultra-thin (4–30 nm) films of SrTiO{sub 3-δ} (STO) grown heteroepitaxially on p-Si(001) substrates by molecular beam epitaxy. We demonstrate that STO band gap tuning can be achieved through strain engineering and show that the energy shift of the direct energy gap transition of SrTiO{sub 3-δ}/Si films has a quantifiable dimensional and doping dependence that correlates well with the changes in crystal structure.
Authors:
; ; ;  [1]
  1. Physics Department, Texas State University, San Marcos, Texas 78666 (United States)
Publication Date:
OSTI Identifier:
22486147
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTALS; ENERGY GAP; MOLECULAR BEAM EPITAXY; OPTICAL PROPERTIES; OXYGEN; STRAINS; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS; TUNING; VACANCIES