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
- 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
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