Sarcan, Fahrettin, Armstrong, Alex J., Bostan, Yusuf K. et al. (4 more authors) (2023) Ultraviolet-Ozone Treatment:an Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS2. Nanomaterials. 3034. ISSN 2079-4991
Abstract
Ultraviolet-ozone (UV-O3) 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-O3 treatment affects the optical and electrical properties of molybdenum disulfide (MoS2), with and without the presence of a dielectric substrate. We performed detailed photoluminescence (PL) measurements on 1–7 layers of MoS2 with up to 8 min of UV-O3 exposure. Density functional theory (DFT) calculations were carried out to provide insight into oxygen-MoS2 interaction mechanisms. Our results showed that the influence of UV-O3 treatment on PL depends on whether the substrate is present, as well as the number of layers. Additionally, 4 min of UV-O3 treatment was found to be optimal to produce p-type MoS2, while maintaining above 80% of the PL intensity and the emission wavelength, compared to pristine flakes (intrinsically n-type). UV-O3 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 MoS2, which should be considered in future device fabrication and applications.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2023 by the authors. Funding Information: This research was funded by the Royal Academy of Engineering (Research Fellowship awarded to Y.W., RF\201718\17131), the Scientific Research Projects Coordination Unit of Istanbul University (FBA-2023-39412, FBG-2022-38573, FBG-2021-37896), the Scientific and Technological Research Council of Turkey (TUBITAK) project (121F169), and EPSRC (EP/R029431 and EP/X035859). |
Keywords: | density functional theory (DFT),doping,field-effect transistor,MoS,photoluminescence,surface treatment,transition metal dichalcogenide,ultraviolet-ozone (UV-O) |
Dates: |
|
Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 11 Jan 2024 16:40 |
Last Modified: | 08 Jan 2025 00:13 |
Published Version: | https://doi.org/10.3390/nano13233034 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.3390/nano13233034 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:207501 |