Inflection points in the conduction-band structure of BaSnO3
| Autor: | Karthik Krishnaswamy, C. G. Van de Walle, Andrew J. E. Rowberg |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics Doping Oxide 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Hybrid functional chemistry.chemical_compound Effective mass (solid-state physics) chemistry Inflection point 0103 physical sciences Density functional theory 010306 general physics 0210 nano-technology Conduction band |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | $\mathrm{BaSn}{\mathrm{O}}_{3}$ (BSO) is a wide-band-gap oxide in which very high levels of $n$-type doping have been demonstrated. Here we perform a detailed investigation of the conduction-band structure of BSO, reporting band velocities and effective masses as a function of energy, and explore whether sufficiently high doping levels can be achieved to fill the conduction band to energies near the inflection point. The presence of carriers near the inflection point can lead to negative differential resistance (NDR) due to the effective mass above the inflection point being negative. Our first-principles calculations, based on density functional theory with a hybrid functional, show that BSO has an inflection point 2.29 eV above the conduction-band minimum and that secondary conduction-band valleys are at least 2 eV higher in energy. We discuss the options available to achieve the required $n$-type doping levels to reach the inflection point in BSO. |
| Databáze: | OpenAIRE |
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