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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
Published on: February 8, 2018
Probing surface and bulk electrochemical processes on the LaAlO3-SrTiO3 interface
Amit Kumar1, Thomas M Arruda, Yunseok Kim
1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
ACS Nano
|April 12, 2012
Summary
Dynamic electrochemical strain microscopy reveals two distinct surface processes on LaAlO(3)-SrTiO(3) heterostructures. These findings indicate complex charge-writing behavior beyond simple surface adsorption effects.
Area of Science:
- Condensed matter physics
- Materials science
- Surface science
Background:
- LaAlO(3)-SrTiO(3) heterostructures exhibit complex electronic properties at their interface.
- Understanding local electrochemical phenomena is crucial for device applications.
Purpose of the Study:
- To investigate local electrochemical phenomena on LaAlO(3)-SrTiO(3) surfaces.
- To differentiate between various electrochemical processes contributing to surface behavior.
Main Methods:
- Utilized unipolar and bipolar dynamic electrochemical strain microscopy (D-ESM).
- Correlated D-ESM results with Kelvin probe force microscopy (KPFM) hysteresis data.
Main Results:
- Identified at least two distinct electrochemical processes: a fast reversible low-voltage process and a slow high-voltage process.
- The high-voltage process is linked to sub-nanometer static surface deformations.
- Observed hysteresis behavior consistent with electrochemical contributions.
Conclusions:
- Charge-writing in LaAlO(3)-SrTiO(3) involves significant surface and bulk electrochemical components.
- The observed phenomena are more complex than solely surface adsorbate screening.
