Wide bandgap BaSnO<sub>3</sub> films with room temperature conductivity exceeding 10<sup>4</sup> S cm<sup>-1</sup>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28474675.
- Also identified by DOI 10.1038/ncomms15167 and PMC identifier 5424175.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Wide bandgap perovskite oxides with high room temperature conductivities and structural compatibility with a diverse family of organic/inorganic perovskite materials are of significant interest as transparent conductors and as active components in power electronics. Such materials must also possess high room temperature mobility to minimize power consumption and to enable high-frequency applications. Here, we report n-type BaSnO<sub>3</sub> films grown using hybrid molecular beam epitaxy with room temperature conductivity exceeding 10<sup>4</sup> S cm<sup>-1</sup>. Significantly, these films show room temperature mobilities up to 120 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup> even at carrier concentrations above 3 × 10<sup>20</sup> cm<sup>-3</sup> together with a wide bandgap (3 eV). We examine the mobility-limiting scattering mechanisms by calculating temperature-dependent mobility, and Seebeck coefficient using the Boltzmann transport framework and ab-initio calculations. These results place perovskite oxide semiconductors for the first time on par with the highly successful III-N system, thereby bringing all-transparent, high-power oxide electronics operating at room temperature a step closer to reality.