Picometer-precision few-tilt ptychotomography of 2D materials

Author(s)
Christoph Hofer, Kimmo Mustonen, Viera Skakalova, Timothy J. Pennycook
Abstract

From ripples to defects, edges and grain boundaries, the 3D atomic structure of 2D materials is critical to their properties. However the damage inflicted by conventional 3D analysis precludes its use with fragile 2D materials, particularly for the analysis of local defects. Here we dramatically increase the potential for precise local 3D atomic structure analysis of 2D materials, with both greatly improved dose efficiency and sensitivity to light elements. We demonstrate light atoms can now be located in complex 2D materials with picometer precision at doses 30 times lower than previously possible. Moreover we demonstrate this using WS

2, in which the light atoms are practically invisible to conventional methods at low doses. The key advance is combining the concept of few tilt tomography with highly dose efficient ptychography in scanning transmission electron microscopy. We further demonstrate the method experimentally with the even more challenging and newly discovered 2D CuI, leveraging a new extremely high temporal resolution camera.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
University of Antwerp, Slovak Academy of Sciences (SAS), Danubia NanoTech Sro
Journal
2D Materials
Volume
10
No. of pages
7
ISSN
2053-1583
Publication date
06-2023
Peer reviewed
Yes
Austrian Fields of Science 2012
103008 Experimental physics
Keywords
ASJC Scopus subject areas
Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering, Chemistry(all), Materials Science(all)
Portal url
https://ucrisportal.univie.ac.at/en/publications/picometerprecision-fewtilt-ptychotomography-of-2d-materials(497108e9-6091-49a6-ba03-8dcb52e75759).html