A comprehensive study on the effects of gamma radiation on the physical properties of a two-dimensional WS2 monolayer semiconductor

Felix, Jorlandio Francisco; Da Silva, Arlon Fernandes; Da Silva, Sebasti�o Willam; Qu, Fanyao; Qiu, Bin; Ren, Junfeng; De Azevedo, Walter Mendes; Henini, Mohamed; Huang, Chung Che

Abstract

© 2020 The Royal Society of Chemistry. This article reports the effects of gamma radiation on the structural, optical and magnetic properties of monolayer tungsten disulfide (WS2) grown by a scalable van der Waals epitaxial (VdWE) process on a SiO2 coated Si substrate. We found that ionizing radiation (gamma ray) interacts strongly with two-dimensional WS2, which induces effective p-doping in the samples. As the radiation dose increases, the p-doping concentration increases substantially. In addition, in the small radiation dose regime, the WS2 monolayers exhibit usual diamagnetic behavior. However, a remarkable ferromagnetic hysteresis emerges when the WS2 monolayer is irradiated with 400 Gys. This is attributed to the presence of irradiation-induced complex vacancies composed of one tungsten and a pair of its nearby sulfurs. Moreover, these results have shown that the detector based on the large scale monolayer VdWE-grown two-dimensional WS2 is an appealing candidate for sensing high-energy photons at small radiation doses.

Citation

Felix, J. F., Da Silva, A. F., Da Silva, S. W., Qu, F., Qiu, B., Ren, J., De Azevedo, W. M., Henini, M., & Huang, C. C. (2020). A comprehensive study on the effects of gamma radiation on the physical properties of a two-dimensional WS2 monolayer semiconductor. Nanoscale Horizons, 5(2), 259-267. https://doi.org/10.1039/c9nh00414a

• Journal Article Type: Article
• Acceptance Date: Oct 1, 2019
• Online Publication Date: Oct 2, 2019
• Publication Date: Feb 1, 2020
• Deposit Date: Oct 2, 2019
• Publicly Available Date: Oct 3, 2020
• Journal: Nanoscale Horizons
• Print ISSN: 2055-6756
• Electronic ISSN: 2055-6764
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Issue: 2
• Pages: 259-267
• DOI: https://doi.org/10.1039/c9nh00414a
• Public URL: https://nottingham-repository.worktribe.com/output/2738033
• Publisher URL: https://pubs.rsc.org/en/Content/ArticleLanding/2019/NH/C9NH00414A#!divAbstract
• Contract Date: Oct 2, 2019