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Nanomaterials
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2D Materials and van der Waals Heterostructures for Optoelectronic Devices
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2D Materials and van der Waals Heterostructures for Optoelectronic Devices

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: 20 September 2024 | Viewed by 3032

Special Issue Editor

Dr. Yue Wang

E-Mail Website
Guest Editor
School of Physics, Engineering and Technology, University of York, York, UK
Interests: 2D materials; silicon photonics; nanofabrication; photonic sensing; semiconductor lasers

Special Issue Information

Dear Colleagues,

2D layered materials such as graphene, black phosphorus, monolayer semiconducting transition metal dichalcogenides and hBN covers a great range of bandgap from 0 to 6 eV. Beyond this, heterostructures achieved by van der Waals stacking of these layered materials reveals more intriguing fundamental physical properties and attractive functionalities. The optical and electronic properties of 2D materials and their heterostructures can be further engineered, tuned, optimised, for example with strain, nanostructured substrate, surface chemistry and so on, which brings great opportunities in optoelectronics applications.

This Special Issue focuses on the latest theoretical and experimental developments in 2D materials and van der Waals heterostructures based optoelectronic devices. We invite authors to contribute original research articles and review articles covering the current progress in 2D materials and devices. We welcomes discussion of new ideas, as well as challenges, of using this family of nanomaterials for future applications and technologies.

Dr. Yue Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • TMDs
  • van der Waals heterostructures
  • optoelectrical devices
  • material engineering
  • 2D Materials

Published Papers (3 papers)

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Research

10 pages, 3353 KiB  
Communication
Photoelectric Properties of GaS1−xSex (0 ≤ x ≤ 1) Layered Crystals
by Yu-Tai Shih, Der-Yuh Lin, Bo-Chang Tseng, Ting-Chen Huang, Yee-Mou Kao, Ming-Cheng Kao and Sheng-Beng Hwang
Nanomaterials 2024, 14(8), 701; https://doi.org/10.3390/nano14080701 - 18 Apr 2024
Viewed by 388
Abstract
In this study, the photoelectric properties of a complete series of GaS1−xSex (0 ≤ x ≤ 1) layered crystals are investigated. The photoconductivity spectra indicate a decreasing bandgap of GaS1−xSex as the Se composition x [...] Read more.
In this study, the photoelectric properties of a complete series of GaS1−xSex (0 ≤ x ≤ 1) layered crystals are investigated. The photoconductivity spectra indicate a decreasing bandgap of GaS1−xSex as the Se composition x increases. Time-resolved photocurrent measurements reveal a significant improvement in the response of GaS1−xSex to light with increasing x. Frequency-dependent photocurrent measurements demonstrate that both pure GaS crystals and GaS1−xSex ternary alloy crystals exhibit a rapid decrease in photocurrents with increasing illumination frequency. Crystals with lower x exhibit a faster decrease in photocurrent. However, pure GaSe crystal maintains its photocurrent significantly even at high frequencies. Measurements for laser-power-dependent photoresponsivity and bias-voltage-dependent photoresponsivity also indicate an increase in the photoresponsivity of GaS1−xSex as x increases. Overall, the photoresponsive performance of GaS1−xSex is enhanced with increasing x, and pure GaSe exhibits the best performance. This result contradicts the findings of previous reports. Additionally, the inverse trends between bandgap and photoresponsivity with increasing x suggest that GaS1−xSex-based photodetectors could potentially offer a high response and wavelength-selectivity for UV and visible light detection. Thus, this work provides novel insights into the photoelectric characteristics of GaS1−xSex layered crystals and highlights their potential for optoelectronic applications. Full article
(This article belongs to the Special Issue 2D Materials and van der Waals Heterostructures for Optoelectronic Devices)
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11 pages, 2891 KiB  
Article
Ultraviolet-Ozone Treatment: An Effective Method for Fine-Tuning Optical and Electrical Properties of Suspended and Substrate-Supported MoS2
by Fahrettin Sarcan, Alex J. Armstrong, Yusuf K. Bostan, Esra Kus, Keith P. McKenna, Ayse Erol and Yue Wang
Nanomaterials 2023, 13(23), 3034; https://doi.org/10.3390/nano13233034 - 27 Nov 2023
Cited by 1 | Viewed by 1230
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue 2D Materials and van der Waals Heterostructures for Optoelectronic Devices)
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14 pages, 15522 KiB  
Article
Influence of Solvents and Adsorption of Organic Molecules on the Properties of CVD Synthesized 2D MoS2
by Antun Lovro Brkić, Antonio Supina, Davor Čapeta, Lucija Dončević, Lucija Ptiček, Šimun Mandić, Livio Racané and Ida Delač
Nanomaterials 2023, 13(14), 2115; https://doi.org/10.3390/nano13142115 - 20 Jul 2023
Viewed by 1014
Abstract
We present a simple method for modification of 2D materials by drop-casting of the organic molecule in solution on the 2D material under ambient conditions. Specifically, we investigated the adsorption of 6-(4,5-Dihydro-1H-imidazol-3-ium-2-yl)-2-(naphthalene-2-yl)benzothiazole methanesulfonate (L63MS) organic molecule on 2D MoS2. [...] Read more.
We present a simple method for modification of 2D materials by drop-casting of the organic molecule in solution on the 2D material under ambient conditions. Specifically, we investigated the adsorption of 6-(4,5-Dihydro-1H-imidazol-3-ium-2-yl)-2-(naphthalene-2-yl)benzothiazole methanesulfonate (L63MS) organic molecule on 2D MoS2. To better understand the effect of the organic molecule on the 2D material, we also investigated the impact of solvents alone on the materials’ properties. The MoS2 samples were synthesized using ambient pressure chemical vapor deposition. Atomic force microscopy, Raman spectroscopy, photoluminescence spectroscopy and optical microscopy were used to characterize the samples. The measurements were performed after synthesis, after the drop-casting of solvents and after the drop-casting of organic molecule solutions. Our results indicate that the used organic molecule effectively adsorbs on and prompts discernible changes in the (opto)electronic properties of the 2D material. These changes encompass variations in the Raman spectra shape, alterations in the photoluminescence (PL) signal characteristics and modifications in excitonic properties. Such alterations can be linked to various phenomena including doping, bandgap modifications, introduction or healing of defects and that the solvent plays a crucial role in the process. Our study provides insights into the modification of 2D materials under ambient conditions and highlights the importance of solvent selection in the process. Full article
(This article belongs to the Special Issue 2D Materials and van der Waals Heterostructures for Optoelectronic Devices)
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