The Vacancy-Induced Electronic Structure of the SrTiO3-δ Surface
- Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
- Northwestern Univ., Evanston, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
Abstract The emergence of a 2D electron gas (2DEG) on the (001) surface of oxygen‐deficient strontium titanate (SrTiO 3−δ ) is investigated. Using in situ soft X‐ray spectroscopy and effective mass modeling, a series of quantitative band diagrams are developed to describe the evolution of near‐surface and bulk carrier concentrations, downward band bending, and Fermi level along a lateral gradient of oxygen vacancies formed on SrTiO 3−δ by direct‐current resistive heating under ultrahigh vacuum conditions. Electrons are accumulated over a 3 nm region near the surface, confined within a potential well with saturated 300 meV downward band bending. The relation between Fermi levels and carrier concentrations near the surface suggests the density of states near the surface is much lower than the bulk density of states, which is consistent with the quantum‐confined subbands of a 2DEG. The quantitative relationship between the surface and bulk electronic structures developed in this work provides a guide for precise engineering of the oxygen‐vacancy‐induced 2DEG in SrTiO 3 .
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); Institute for Catalysis in Energy Processes (ICEP); USDOE
- Grant/Contract Number:
- AC02-06CH11357; DMR-1334713; DMR-1333335; FG02-03ER15457; FG02-01ER45945; DE‐AC02‐06CH11357; DE‐FG02‐03ER15457; DE‐FG02‐01ER45945
- OSTI ID:
- 1499278
- Alternate ID(s):
- OSTI ID: 1482131; OSTI ID: 1870982
- Journal Information:
- Advanced Electronic Materials, Vol. 5, Issue 1; ISSN 2199-160X
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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