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Atomically Traceable Nanostructure Fabrication

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Published on: July 17, 2015

Offcut Substrate-Induced Defect Trapping at Step Edges.

Nicolas Bonmassar¹, Georg Christiani¹, Gennady Logvenov¹

¹Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.

|April 26, 2024

Summary

Localized defects at step edges in oxide heterostructures prevent antiphase boundaries. This nanoscale defect control is achieved through strain-induced oxygen vacancies in La0.66Sr0.34MnO3 layers.

Keywords:

Bidirectional growth Defect engineering Oxide molecular beam epitaxy Scanning transmission electron microscopy Step edge interface

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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

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Published on: July 17, 2020

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Oxide heterostructures offer tunable electronic properties.
Antiphase boundaries can disrupt desired functionalities in layered materials.
Controlling defect formation is crucial for advanced material design.

Purpose of the Study:

To investigate the formation of localized defects at step edges in a specific trilayer oxide heterostructure.
To understand the mechanism of defect formation and its impact on subsequent boundary development.
To demonstrate nanoscale control over defect engineering in complex oxides.

Main Methods:

Fabrication of a trilayer heterostructure: superconducting La1.84Sr0.16CuO4 / La0.66Sr0.34MnO3 / insulating La2CuO4.
Atomically resolved electron energy-loss spectroscopy (AEELS) mapping.
Analysis of lattice mismatches (a-axis and c-axis) at step edges.

Main Results:

Localized defects exclusively formed at step edges due to significant c-axis mismatch.
Electron energy-loss spectroscopy revealed oxygen vacancies in the La0.66Sr0.34MnO3 layer near step edges.
These localized defects effectively suppressed the formation of antiphase boundaries in the bulk structure.

Conclusions:

Step edges in oxide heterostructures act as nucleation sites for specific, localized defects.
Strain at step edges can induce oxygen vacancies, altering local electronic properties.
This work demonstrates a method for nanoscale defect control, offering pathways for tailored material properties.