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Interface polarization model for a 2-dimensional electron gas at the BaSnO3/LaInO3 interface.

Young Mo Kim1, T Markurt2, Youjung Kim1

  • 1Institute of Applied Physics, Dept. of Physics and Astronomy, Seoul National University, Seoul, 08826, Korea.

Scientific Reports
|November 9, 2019
PubMed
Summary
This summary is machine-generated.

A new model explains sheet carrier density in BaSnO3/LaInO3 heterostructures by incorporating interface polarization in LaInO3. This model accurately predicts carrier density based on LaInO3 thickness and BaSnO3 doping levels.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • The BaSnO3/LaInO3 heterostructure is a promising material for electronic applications.
  • Understanding the factors controlling its sheet carrier density is crucial for device optimization.

Purpose of the Study:

  • To develop a theoretical model explaining the experimental sheet carrier density (n2D) at the BaSnO3/LaInO3 interface.
  • To investigate the influence of interface polarization, LaInO3 layer thickness, and BaSnO3 doping on carrier density.

Main Methods:

  • Development of a model based on interface polarization in LaInO3 extending over a few unit cells.
  • 1D Poisson-Schrödinger equation calculations.
  • Quantitative analysis of atomic positions using high-resolution transmission electron microscopy (HRTEM).

Main Results:

  • The proposed model successfully explains the dependence of sheet carrier density on LaInO3 thickness and La doping.
  • Interface polarization in LaInO3, extending over 2-3 unit cells, is identified as the key factor.
  • HRTEM analysis confirms structural changes (suppressed octahedral tilt, lattice expansion) in LaInO3 near the interface.

Conclusions:

  • Interface polarization in LaInO3 is the primary mechanism responsible for the observed sheet carrier density in BaSnO3/LaInO3 heterostructures.
  • The developed model provides a quantitative framework for predicting and controlling carrier density in these materials.