The Role of Oxygen Atoms on Excitons at the Edges of Monolayer WS2
| العنوان: | The Role of Oxygen Atoms on Excitons at the Edges of Monolayer WS2 |
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| المؤلفون: | Yanpeng Liu, Xinyun Wang, Qi Zhang, Alexandra Carvalho, Antonio H. Castro Neto, Zhenliang Hu, Maria C. Asensio, José Avila, Jin Feng Leong, Chorng Haur Sow, Junpeng Lu |
| المصدر: | Nano Letters. 19:4641-4650 |
| بيانات النشر: | American Chemical Society (ACS), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Photoluminescence, Materials science, Mechanical Engineering, Exciton, Bioengineering, 02 engineering and technology, General Chemistry, Electronic structure, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Chemisorption, Chemical physics, Monolayer, General Materials Science, Density functional theory, Trion, 0210 nano-technology, Electronic density |
| الوصف: | We clarify that the chemisorption of oxygen atoms at the edges is a key contributor to the frequently observed edge enhancement and spatial non-uniformities of photoluminescence (PL) in WS2 monolayers. Here we have investigated with momentum- and real-space nanoimaging of the chemical and electronic density inhomogeneity of WS2 flakes. Our finding from a large panoply of techniques together with density functional theory calculation confirms that the oxygen chemisorption leads to the electron accumulation at the edges. This facilitates the trion dominance of PL at the edges of WS2 flakes. Our results highlight and unravel the significance of chemisorbed oxygen at the edges in the PL emission and electronic structure of WS2, providing a viable path to enhance the performance of transition-metal-dichalcogenide-based devices. |
| تدمد: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.9b01670 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::d112699f13fc0276d2b5f77dcdf7ce42 https://doi.org/10.1021/acs.nanolett.9b01670 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........d112699f13fc0276d2b5f77dcdf7ce42 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15306992 15306984 |
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| DOI: | 10.1021/acs.nanolett.9b01670 |