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2D Materials for Electronic and Optoelectronic Devices

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Electronic Materials".

Deadline for manuscript submissions: 20 October 2024 | Viewed by 6662

Special Issue Editors

Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO, USA
Interests: two-dimensional materials; integrated photonics; metasurface; optoelectronics
Department of Electrical Engineering, Pennsylvania State University, University Park, PA, USA
Interests: nanophotonics; metasurface; 2D materials

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Guest Editor
Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Interests: fiber optics; two-dimensional materials; nanophotonics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues,

Two-dimensional (2D) materials with unique electronic and optoelectronic attributes have spurred a wide spectrum of applications with record-setting performances and interesting semiconductor physics. For instance, graphene can act as a monolayer of carbon atoms for broadband photodetectors or an on-chip waveguide-integrated optical modulator, and finds use in nonlinear optical applications. Transition-metal dichalcogenides can be used as ultrathin optical gain media for light sources and electronic transistors.

Abundant photonics and electronic physics can be also explored using these low-dimensional material platforms, including Moiré superlattices, excitons and phonon polaritons. Furthermore, 2D materials can be combined with various photonic structures, such as metasurfaces, photonic crystals, optical resonators and waveguides, for a diverse range of extended functionalities, and transformed into different types of electrical device layouts for electronic transistors, memristors and so on.

In view of this vibrant field of research, for this Special Issue, “2D Materials for Electronic and Optoelectronic Devices”, we encourage the submission of all relevant papers on 2D materials for photonic, electronic or optoelectronic applications. Original research articles and review papers are all welcome.

Dr. Yuan Meng
Dr. Yimin Ding
Dr. Qirong Xiao
Guest Editors

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. Materials 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 2600 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

  • two-dimensional materials
  • nanophononics
  • integrated photonics
  • metasurface
  • optoelectronics
  • 2D electronics
  • transistors

Published Papers (4 papers)

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Research

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15 pages, 5245 KiB  
Article
Preparation of Electrodes with β-Nickel Hydroxide/CVD-Graphene/3D-Nickel Foam Composite Structures to Enhance the Capacitance Characteristics of Supercapacitors
by Yang-Ming Lu and Sheng-Huai Hong
Materials 2024, 17(1), 23; https://doi.org/10.3390/ma17010023 - 20 Dec 2023
Cited by 1 | Viewed by 779
Abstract
Supercapacitors have the characteristics of high power density, long cycle life, and fast charge and discharge rates, making them promising alternatives to traditional capacitors and batteries. The use of transition-metal compounds as electrode materials for supercapacitors has been a compelling research topic in [...] Read more.
Supercapacitors have the characteristics of high power density, long cycle life, and fast charge and discharge rates, making them promising alternatives to traditional capacitors and batteries. The use of transition-metal compounds as electrode materials for supercapacitors has been a compelling research topic in recent years because their use can effectively enhance the electrical performance of supercapacitors. The current research on capacitor electrode materials can mainly be divided into the following three categories: carbon-based materials, metal oxides, and conductive polymers. Nickel hydroxide (Ni(OH)2) is a potential electrode material for use in supercapacitors. Depending on the preparation conditions, two crystal phases of nickel hydroxide, α and β, can be produced. When compared to α-NiOH, the structure of β-Ni(OH)2 does not experience ion intercalation. As a result, the carrier transmission rate of α-Ni(OH)2 is slower, and its specific capacitance value is smaller. Its carrier transport rate can be improved by adding conductive materials, such as graphene. β-Ni(OH)2 was chosen as an electrode material for a supercapacitor in this study. Homemade low-pressure chemical vapor deposition graphene (LPCVD-Graphene) conductive material was introduced to modify β-Ni(OH)2 in order to increase its carrier transport rate. The LPCVD method was used to grow high-quality graphene films on three-dimensional (3D) nickel foam substrates. Then, a hydrothermal synthesis method was used to grow β-Ni(OH)2 nanostructures on the 3D graphene/nickel foam substrate. In order to improve the electrical properties of the composite structure, a high-quality graphene layer was incorporated between the nickel hydroxide and the 3D nickel foam substrate. The effect of the conductive graphene layer on the growth of β-Ni(OH)2, as well as its electrical properties and electrochemical performance, was studied. When this β-Ni(OH)2/CVD-Graphene/3D-NF (nickel foam) material was used as the working electrodes of the supercapacitor under a current density of 1 A/g and 3 A/g, they exhibited a specific capacitance of 2015 F/g and 1218.9 F/g, respectively. This capacitance value is 2.62 times higher than that of the structure without modification with a graphene layer. The capacitance value remains at 99.2% even after 1000 consecutive charge and discharge cycles at a current density of 20 A/g. This value also improved compared to the structure without graphene layer modification (94.7%). Full article
(This article belongs to the Special Issue 2D Materials for Electronic and Optoelectronic Devices)
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13 pages, 3351 KiB  
Article
Multifunctional Motion Sensing Enabled by Laser-Induced Graphene
by Bowen Deng, Zongyuan Wang, Weiguang Liu and Bin Hu
Materials 2023, 16(19), 6363; https://doi.org/10.3390/ma16196363 - 22 Sep 2023
Viewed by 1008
Abstract
The development of flexible sensors based on laser-induced graphene (LIG) has recently attracted much attention. It was commonly generated by laser-ablating commercial polyimide (PI). However, the weak mechanical extensibility of PI limits the development and diversified applications of LIG-based sensors. In this work, [...] Read more.
The development of flexible sensors based on laser-induced graphene (LIG) has recently attracted much attention. It was commonly generated by laser-ablating commercial polyimide (PI). However, the weak mechanical extensibility of PI limits the development and diversified applications of LIG-based sensors. In this work, we adopted medical polyurethane (PU) tapes to peel off the LIG generated on PI and developed flexible and wearable sensors based on the proposed LIG/PU composite structure. Compared with other methods for LIG transfer, PU tape has many advantages, including a simplified process and being less time-consuming. We characterized the LIG samples generated under different laser powers and analyzed the property differences introduced by the transfer operation. We then studied the impact of fabrication mode on the strain sensitivity of the LIG/PU and optimized the design of a LIG/PU-based strain sensor, which possessed a gauge factor (GF) of up to 263.6 in the strain range of 75–90%. In addition, we designed a capacitive pressure sensor for tactile sensing, which is composed of two LIG/PU composite structures and a PI space layer. These LIG flexible devices can be used for human motion monitoring and tactile perception in sports events. This work provides a simple, fast, and low-cost way for the preparation of multifunctional sensor systems with good performance, which has a broad application prospect in human motion monitoring. Full article
(This article belongs to the Special Issue 2D Materials for Electronic and Optoelectronic Devices)
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10 pages, 5807 KiB  
Article
An Anthracene-Based Bis-Stilbene Derivative as Luminescent Materials for Organic Light Emitting Diodes
by Hui Wang, Houlin Wu, Guangling Bian and Ling Song
Materials 2023, 16(10), 3685; https://doi.org/10.3390/ma16103685 - 12 May 2023
Cited by 2 | Viewed by 1506
Abstract
In this work, a new luminescent material of a small-molecule stilbene derivative (BABCz) containing anthracene was designed and synthesized by three simple reactions. The material was characterized by 1H-NMR, FTMS, and X-ray and tested using TGA, DSC, UV/Vis, fluorescence spectroscopy, and atomic [...] Read more.
In this work, a new luminescent material of a small-molecule stilbene derivative (BABCz) containing anthracene was designed and synthesized by three simple reactions. The material was characterized by 1H-NMR, FTMS, and X-ray and tested using TGA, DSC, UV/Vis, fluorescence spectroscopy, and atomic force microscopy. The results demonstrate that BABCz has luminescence properties with good thermal stability and can be doped with 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) to prepare highly uniform films, which allows the fabrication of OLED devices with ITO/Cs2CO3:BABCz/CBP:BABCz/MoO3/Al configuration. This simplest device in the sandwich structure emits green light at 6.6–12 V and has a brightness of 2300 cd/m2, indicating the potential of this material in OLED manufacturing. Full article
(This article belongs to the Special Issue 2D Materials for Electronic and Optoelectronic Devices)
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Review

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20 pages, 2935 KiB  
Review
Photonic Bound States in the Continuum in Nanostructures
by Hongkun Zhong, Tiantian He, Yuan Meng and Qirong Xiao
Materials 2023, 16(22), 7112; https://doi.org/10.3390/ma16227112 - 10 Nov 2023
Cited by 2 | Viewed by 2380
Abstract
Bound states in the continuum (BIC) have garnered considerable attention recently for their unique capacity to confine electromagnetic waves within an open or non-Hermitian system. Utilizing a variety of light confinement mechanisms, nanostructures can achieve ultra-high quality factors and intense field localization with [...] Read more.
Bound states in the continuum (BIC) have garnered considerable attention recently for their unique capacity to confine electromagnetic waves within an open or non-Hermitian system. Utilizing a variety of light confinement mechanisms, nanostructures can achieve ultra-high quality factors and intense field localization with BIC, offering advantages such as long-living resonance modes, adaptable light control, and enhanced light-matter interactions, paving the way for innovative developments in photonics. This review outlines novel functionality and performance enhancements by synergizing optical BIC with diverse nanostructures, delivering an in-depth analysis of BIC designs in gratings, photonic crystals, waveguides, and metasurfaces. Additionally, we showcase the latest advancements of BIC in 2D material platforms and suggest potential trajectories for future research. Full article
(This article belongs to the Special Issue 2D Materials for Electronic and Optoelectronic Devices)
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