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Published on: April 9, 2014
Characterizing the two- and three-dimensional resolution of an improved aberration-corrected STEM
A R Lupini1, A Y Borisevich, J C Idrobo
1Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA. 9az@ornl.gov
Summary
Aberration-corrected scanning transmission electron microscopes now achieve atomic resolution, enabling the visualization of single dopant atoms in three dimensions. This advancement pushes the boundaries of materials science and nanotechnology.
Area of Science:
- Electron microscopy
- Materials science
- Nanotechnology
Background:
- Third-order aberration correctors have made aberration-corrected electron microscopes common in laboratories.
- Aberration correction is crucial for high-resolution imaging in transmission electron microscopy.
Purpose of the Study:
- To evaluate the 2D and 3D performance of a new aberration-corrected scanning transmission electron microscope.
- To demonstrate the capabilities of a prototype corrector minimizing fifth-order aberrations and a higher brightness gun.
Main Methods:
- Utilizing an aberration-corrected scanning transmission electron microscope with a prototype improved aberration corrector.
- Employing a new, higher brightness electron gun for enhanced performance.
Main Results:
- Achieved resolution of atomic columns separated by 0.63 Angstroms.
- Demonstrated the detection of single dopant atoms with three-dimensional sensitivity.
Conclusions:
- The enhanced aberration corrector and electron gun significantly improve scanning transmission electron microscopy performance.
- This technology enables atomic-scale characterization and the study of individual dopant atoms in 3D.
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