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The Electrical Double Layer

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Updated: Apr 2, 2026

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

Published on: December 4, 2014

Atomic layer engineering of perovskite oxides for chemically sharp heterointerfaces.

Woo Seok Choi¹, Christopher M Rouleau, Sung Seok A Seo

¹Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

Advanced Materials (Deerfield Beach, Fla.)

|October 5, 2012

Summary

Atomic layer engineering creates sharp oxide interfaces. Growing a LaAlO(3) monolayer at high oxygen pressure significantly improves the abruptness of LaAlO(3)/SrTiO(3) heterostructures.

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Published on: May 29, 2018

Area of Science:

Materials Science
Solid State Physics
Surface Science

Background:

Oxide heterointerfaces are crucial for advanced electronic devices.
Achieving atomically sharp interfaces is essential for controlling emergent phenomena.
Pulsed laser deposition (PLD) is a key technique for fabricating complex oxide heterostructures.

Purpose of the Study:

Investigate interface formation and strain evolution in LaAlO(3)/SrTiO(3) heterostructures.
Determine methods to control and enhance the atomic sharpness of the oxide interface.
Explore the impact of growth conditions on interface abruptness.

Main Methods:

Utilized pulsed laser deposition (PLD) for growing LaAlO(3) on SrTiO(3).
Systematically varied growth parameters, focusing on oxygen pressure.
Employed techniques to analyze interface structure and abruptness (e.g., in-situ RHEED, ex-situ TEM - *implied*).

Main Results:

Demonstrated that atomic layer engineering can yield chemically sharp oxide heterointerfaces.
Identified high oxygen pressure during LaAlO(3) growth as critical for interface abruptness.
Observed significant enhancement in interface abruptness by inserting a single monolayer of LaAlO(3) under optimized conditions.

Conclusions:

Atomic layer engineering provides a pathway to fabricate highly abrupt oxide heterointerfaces.
Optimizing growth conditions, specifically high oxygen pressure, is vital for controlling interface quality.
The findings offer a method to enhance the performance of oxide heterostructure-based devices.