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Radiation tolerance of two-dimensional material-based devices for space applications.
Tobias Vogl1, Kabilan Sripathy2, Ankur Sharma3
1Centre for Quantum Computation and Communication Technology, Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Acton, ACT, 2601, Australia. tobias.vogl@anu.edu.au.
Two-dimensional material devices show robust performance in space radiation environments. Excessive gamma radiation even healed defects in tungsten disulfide (WS₂) monolayers by passivating sulfur vacancies.
Area of Science:
- Materials Science
- Nanotechnology
- Space Science
Background:
- Two-dimensional (2D) materials offer low size, weight, and power advantages for space instrumentation.
- Applications include photovoltaics, batteries, electronics, sensors, and quantum communication light sources.
Purpose of the Study:
- To comprehensively study the combined radiation effects on various 2D material devices in Earth's atmosphere.
- To assess the suitability of these nanomaterials for space applications under irradiation.
Main Methods:
- Theoretical modeling to estimate radiation levels.
- Exposure of field-effect transistors, single-photon sources, and monolayers to gamma rays, protons, and electrons.
- Analysis of device performance and material properties post-irradiation.
Main Results:
- Devices exhibited negligible performance changes after irradiation, indicating space suitability.
- Monolayer tungsten disulfide (WS₂) showed decreased defect densities under excessive gamma radiation.
- Observed defect healing in WS₂ attributed to oxygen passivation of sulfur vacancies, evidenced by increased photoluminescence and carrier lifetime.
Conclusions:
- 2D material-based devices demonstrate robust performance and suitability for space applications.
- Gamma radiation can induce defect healing in WS₂ monolayers, enhancing material properties.
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