Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub>
Ultraviolet-ozone (UV-O<sub>3</sub>) treatment is a simple but effective technique for surface cleaning, surface sterilization, doping, and oxidation, and is applicable to a wide range of materials. In this study, we investigated how UV-O<sub>3</sub> treatment affects the opt...
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| Format: | Article |
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MDPI AG
2023-11-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/23/3034 |
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| author | Fahrettin Sarcan Alex J. Armstrong Yusuf K. Bostan Esra Kus Keith P. McKenna Ayse Erol Yue Wang |
| author_facet | Fahrettin Sarcan Alex J. Armstrong Yusuf K. Bostan Esra Kus Keith P. McKenna Ayse Erol Yue Wang |
| author_sort | Fahrettin Sarcan |
| collection | DOAJ |
| description | Ultraviolet-ozone (UV-O<sub>3</sub>) treatment is a simple but effective technique for surface cleaning, surface sterilization, doping, and oxidation, and is applicable to a wide range of materials. In this study, we investigated how UV-O<sub>3</sub> treatment affects the optical and electrical properties of molybdenum disulfide (MoS<sub>2</sub>), with and without the presence of a dielectric substrate. We performed detailed photoluminescence (PL) measurements on 1–7 layers of MoS<sub>2</sub> with up to 8 min of UV-O<sub>3</sub> exposure. Density functional theory (DFT) calculations were carried out to provide insight into oxygen-MoS<sub>2</sub> interaction mechanisms. Our results showed that the influence of UV-O<sub>3</sub> treatment on PL depends on whether the substrate is present, as well as the number of layers. Additionally, 4 min of UV-O<sub>3</sub> treatment was found to be optimal to produce p-type MoS<sub>2</sub>, while maintaining above 80% of the PL intensity and the emission wavelength, compared to pristine flakes (intrinsically n-type). UV-O<sub>3</sub> treatment for more than 6 min not only caused a reduction in the electron density but also deteriorated the hole-dominated transport. It is revealed that the substrate plays a critical role in the manipulation of the electrical and optical properties of MoS<sub>2</sub>, which should be considered in future device fabrication and applications. |
| first_indexed | 2024-03-09T01:46:04Z |
| format | Article |
| id | doaj.art-83d6a09eec7643aa92dc146e31f55314 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T01:46:04Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-83d6a09eec7643aa92dc146e31f553142023-12-08T15:22:57ZengMDPI AGNanomaterials2079-49912023-11-011323303410.3390/nano13233034Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub>Fahrettin Sarcan0Alex J. Armstrong1Yusuf K. Bostan2Esra Kus3Keith P. McKenna4Ayse Erol5Yue Wang6School of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, UKSchool of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, UKDepartment of Physics, Faculty of Science, Istanbul University, Vezneciler, Istanbul 34134, TurkeyDepartment of Physics, Faculty of Science, Istanbul University, Vezneciler, Istanbul 34134, TurkeySchool of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, UKDepartment of Physics, Faculty of Science, Istanbul University, Vezneciler, Istanbul 34134, TurkeySchool of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, UKUltraviolet-ozone (UV-O<sub>3</sub>) treatment is a simple but effective technique for surface cleaning, surface sterilization, doping, and oxidation, and is applicable to a wide range of materials. In this study, we investigated how UV-O<sub>3</sub> treatment affects the optical and electrical properties of molybdenum disulfide (MoS<sub>2</sub>), with and without the presence of a dielectric substrate. We performed detailed photoluminescence (PL) measurements on 1–7 layers of MoS<sub>2</sub> with up to 8 min of UV-O<sub>3</sub> exposure. Density functional theory (DFT) calculations were carried out to provide insight into oxygen-MoS<sub>2</sub> interaction mechanisms. Our results showed that the influence of UV-O<sub>3</sub> treatment on PL depends on whether the substrate is present, as well as the number of layers. Additionally, 4 min of UV-O<sub>3</sub> treatment was found to be optimal to produce p-type MoS<sub>2</sub>, while maintaining above 80% of the PL intensity and the emission wavelength, compared to pristine flakes (intrinsically n-type). UV-O<sub>3</sub> treatment for more than 6 min not only caused a reduction in the electron density but also deteriorated the hole-dominated transport. It is revealed that the substrate plays a critical role in the manipulation of the electrical and optical properties of MoS<sub>2</sub>, which should be considered in future device fabrication and applications.https://www.mdpi.com/2079-4991/13/23/3034MoS<sub>2</sub>ultraviolet-ozone (UV-O<sub>3</sub>)dopingsurface treatmenttransition metal dichalcogenidefield-effect transistor |
| spellingShingle | Fahrettin Sarcan Alex J. Armstrong Yusuf K. Bostan Esra Kus Keith P. McKenna Ayse Erol Yue Wang Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub> Nanomaterials MoS<sub>2</sub> ultraviolet-ozone (UV-O<sub>3</sub>) doping surface treatment transition metal dichalcogenide field-effect transistor |
| title | Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub> |
| title_full | Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub> |
| title_fullStr | Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub> |
| title_full_unstemmed | Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub> |
| title_short | Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS<sub>2</sub> |
| title_sort | ultraviolet ozone treatment an effective method for fine tuning optical and electrical properties of suspended and substrate supported mos sub 2 sub |
| topic | MoS<sub>2</sub> ultraviolet-ozone (UV-O<sub>3</sub>) doping surface treatment transition metal dichalcogenide field-effect transistor |
| url | https://www.mdpi.com/2079-4991/13/23/3034 |
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