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Research Highlight | Materials Science Division

Understanding the effect of vacancies on the surface electronic structure of SrTiO3

In a study published in Advanced Electronic Materials, researchers developed work in the quantitative relationship between the surface and bulk electronic structures provides guide for precise engineering of the oxygen‐vacancy‐induced 2DEG in SrTiO3.

Scientific Achievement

Using in-situ soft X-ray spectroscopy and effective mass modeling, we quantitatively describe how vacancies impact the band structure and carrier concentrations at the SrTiO3 surface

Significance and Impact

Our in-situ X-ray results indicate that simple vacuum annealing of SrTiO3 leads to 2D electron gas formation with a density that can be tuned by the degree of surface band bending, enabling the precise engineering of surface carrier densities

Research Details

  • Performed in-situ studies at the Advanced Photon Source on single crystal SrTiO3 (001) with an oxygen vacancy gradient
  • Exploited the blue luminescence property of electron-doped SrTiO3 (X-ray excited optical luminescence) to quantify surface vs bulk electron concentrations
  • Used effective mass modeling to relate the measured concentrations by the position of the Fermi level

DOI10.1002/aelm.201800460

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