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Related Experiment Video

Updated: Feb 28, 2026

Fabrication of Spatially Confined Complex Oxides

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

Electronic Band Alignment at Complex Oxide Interfaces Measured by Scanning Photocurrent Microscopy.

J H Yoon¹, H J Jung¹, J T Hong¹

¹Department of Physics and Department of Energy Systems Research, Ajou University, Suwon, 16499, Korea.

Scientific Reports

|June 21, 2017

Summary

Researchers investigated the electronic band alignment at an Al2O3/SrTiO3 heterointerface forming a two-dimensional electron gas (2DEG). Scanning photocurrent microscopy revealed unique gate responses, enabling valence band offset determination.

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Area of Science:

Materials Science
Condensed Matter Physics
Semiconductor Heterostructures

Background:

The Al2O3/SrTiO3 interface is crucial for forming two-dimensional electron gases (2DEGs).
Understanding band alignment is essential for device performance and novel electronic applications.
Scanning Photocurrent Microscopy (SPCM) is a powerful tool for probing interfacial electronic properties.

Purpose of the Study:

To investigate the band alignment at the Al2O3/SrTiO3 heterointerface.
To characterize the electronic properties of the 2DEG formed at this interface.
To determine the valence band offset using SPCM in an electrolyte-gated environment.

Main Methods:

Utilized scanning photocurrent microscopy (SPCM) with a focused UV laser.
Employed an electrolyte-gated environment for tunable device characteristics.
Performed transport measurements to analyze gate-dependent conductance.

Main Results:

SPCM on bare SrTiO3 showed p-type behavior, collecting photogenerated electrons.
SPCM on the 2DEG device exhibited hole carrier collection, indicating unique interfacial behavior.
Gate-dependent conductance measurements confirmed n-type switching behavior of the 2DEG.
Observed unique SPCM gate responses in 2DEG devices, distinct from conventional semiconductors.

Conclusions:

The study successfully determined the electronic band alignment at the Al2O3/SrTiO3 heterointerface.
SPCM in an electrolyte-gated setup is effective for investigating 2DEG properties and band offsets.
The findings provide critical insights into the behavior of 2DEGs at oxide interfaces.