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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Oxide Two-Dimensional Electron Gas with High Mobility at Room-Temperature.

Kitae Eom1, Hanjong Paik2,3, Jinsol Seo4

  • 1Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 21, 2022
PubMed
Summary
This summary is machine-generated.

High-mobility two-dimensional electron gases (2DEGs) were formed at the LaScO3/BaSnO3 interface. This breakthrough in oxide electronics offers higher room-temperature mobility than previously achieved, paving the way for advanced transparent transistors.

Keywords:
2-dimensional electron gasalkaline-earth stannateroom temperature high mobilitytransparent conducting oxide

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Area of Science:

  • Oxide electronics
  • Materials science
  • Condensed matter physics

Background:

  • Two-dimensional electron gases (2DEGs) in wide-bandgap perovskites are promising for high-performance oxide electronics.
  • Previous research on 2DEGs in BaSnO3-based heterostructures has been limited.
  • Achieving high mobility at room temperature is crucial for practical applications.

Purpose of the Study:

  • To report the formation of a 2DEG at the LaScO3/BaSnO3 (LSO/BSO) interface.
  • To investigate methods for enhancing 2DEG mobility in these heterostructures.
  • To explore the potential of stannate-based 2DEGs for oxide nanoelectronics.

Main Methods:

  • Epitaxial growth of LaScO3 on BaSnO3 using a thick buffer layer and ex situ high-temperature treatment.
  • Characterization of the interface using transmission electron microscopy (TEM) and electron holography.
  • Measurement of carrier concentration and mobility at room temperature.

Main Results:

  • Formation of a 2DEG at the LSO/BSO interface with a room-temperature mobility of 60 cm^2 V^-1 s^-1.
  • Carrier concentration achieved was 1.7 × 10^13 cm^-2.
  • Significant reduction in threading dislocation density and evidence of spatial confinement of the 2DEG at the interface.
  • Achieved mobility is an order of magnitude higher than in SrTiO3-based 2DEGs.

Conclusions:

  • The developed method enables the creation of high-mobility 2DEGs in stannate heterostructures.
  • This work provides a new route for exploring the physics of 2DEGs in BaSnO3-based systems.
  • The findings open possibilities for developing novel oxide nanoelectronic devices, including transparent and high-electron mobility transistors.