Electron irradiation effects on monolayer MoS₂ at elevated temperatures

Autor(en)

Carsten Speckmann, Kimmo Mustonen, Diana Propst, Clemens Mangler, Jani Kotakoski

Abstrakt

The effect of electron irradiation on two-dimensional (2D) materials is an important topic, both for the correct interpretation of electron microscopy experiments and for possible applications in electron lithography. After the importance of including inelastic scattering damage in theoretical models describing beam damage and the lack of oxygen sensitivity under electron irradiation in 2D MoS2 were recently shown, the role of temperature has remained unexplored on a quantitative level. Here we show the effect of temperature on the creation of individual defects and the effect of temperature on defect dynamics. Based on the measured displacement cross section of sulfur atoms in MoS2 by atomic resolution scanning transmission electron microscopy, we find an increased probability for defect creation for temperatures up to 150°C, in accordance with theoretical predictions. However, higher temperatures lead to a decrease of the observed cross sections. Despite this apparent decrease, we find that the elevated temperature does not mitigate the creation of defects as this observation would suggest, but rather hides the created damage due to rapid thermal diffusion of the created vacancies before their detection, leading to the formation of vacancy lines and pores outside the measurement's field of view. Using the experimental data in combination with previously reported theoretical models for the displacement cross section, we estimate the migration energy barrier of sulfur vacancies in MoS2 to be 0.26±0.13eV. These results mark another step towards the complete understanding of electron beam damage in MoS2.

Organisation(en)

Physik Nanostrukturierter Materialien

Journal

Physical Review B

Band

111

Anzahl der Seiten

8

ISSN

2469-9950

DOI

https://doi.org/10.48550/arXiv.2411.03200

Publikationsdatum

02-2025

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik, 103015 Kondensierte Materie, 103042 Elektronenmikroskopie

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4b8fe9cb-3064-46b1-9ec4-708e5eaa32ed