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Organic Materials for Electronic and Optoelectronic Applications

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

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 10731

Special Issue Editor

Department of Engineering, University of Palermo, Viale delle Scienze (ed. 9), I-90128 Palermo, Italy
Interests: nanoelectronics; nanotechnology; memristors; light-emitting diodes (LEDs); solar cells

Special Issue Information

Dear Colleagues,

Electrically and optically active organic materials have attracted a lot of interest in recent years because of their potential use for the fabrication of low-cost and lightweight electronic and optoelectronic devices. The maturity gained by these materials, together with a more reliable device technology has allowed incorporating organic electronic and optoelectronic components in commercial products, including organic light emitting diodes (OLED) displays, flexible electronic paper, and sensing devices for drug screening and biomedical testing.

This Special Issue aims to collect original manuscripts focused on recent progress made in organic or hybrid materials-based electronic and optoelectronic devices and relative applications. Review papers, highlighting the state-of-the-art of organic materials, devices, and applications are also very welcome.

Topics include but are not limited to:

Wearable, flexible, disposable, and biodegradable electronics, thin film transistors, nanoelectronics, data storage devices, solar cells, sensors, light-emitting diodes and displays, optical communication, bioelectronics, and electrochromic devices.

Dr. Roberto Macaluso
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. 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

  • Light-emitting diodes (LEDs)
  • Thin film transistors (TFTs)
  • Flexible electronics
  • Disposable electronics
  • Sensors
  • Nanoelectronics
  • Data storage devices
  • Solar cells
  • Bioelectronics
  • Electrochromic devices

Published Papers (4 papers)

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Research

Jump to: Review

12 pages, 23732 KiB  
Article
The Effect of Reactive Sputtering on the Microstructure of Parylene-C
by Akeem Raji, Ye-Seul Lee, Seung-Yo Baek, Ji-Hyeon Yoon, Akpeko Gasonoo, Jonghee Lee and Jae-Hyun Lee
Materials 2022, 15(15), 5203; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155203 - 27 Jul 2022
Cited by 2 | Viewed by 1169
Abstract
Sputtering technique involves the use of plasma that locally heats surfaces of substrates during the deposition of atoms or molecules. This modifies the microstructure by increasing crystallinity and the adhesive properties of the substrate. In this study, the effect of sputtering on the [...] Read more.
Sputtering technique involves the use of plasma that locally heats surfaces of substrates during the deposition of atoms or molecules. This modifies the microstructure by increasing crystallinity and the adhesive properties of the substrate. In this study, the effect of sputtering on the microstructure of parylene-C was investigated in an aluminum nitride (AlN)-rich plasma environment. The sputtering process was carried out for 30, 45, 90 and 120 min on a 5 μm thick parylene-C film. Topography and morphology analyses were conducted on the parylene-C/AlN bilayers. Based on the experimental data, the results showed that the crystallinity of parylene-C/AlN bilayers was increased after 30 min of sputtering and remained saturated for 120 min. A scratch-resistance test conducted on the bilayers depicted that a higher force is required to delaminate the bilayers on top of the substrate. Thus, the adhesion properties of parylene-C/AlN bilayers were improved on glass substrate by about 17% during the variation of sputtering time. Full article
(This article belongs to the Special Issue Organic Materials for Electronic and Optoelectronic Applications)
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12 pages, 562 KiB  
Article
Effect of Impurity Adsorption on the Electronic and Transport Properties of Graphene Nanogaps
by Pablo Álvarez-Rodríguez and Víctor Manuel García-Suárez
Materials 2022, 15(2), 500; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15020500 - 10 Jan 2022
Cited by 1 | Viewed by 1075
Abstract
Graphene stands out as a versatile material with several uses in fields that range from electronics to biology. In particular, graphene has been proposed as an electrode in molecular electronics devices that are expected to be more stable and reproducible than typical ones [...] Read more.
Graphene stands out as a versatile material with several uses in fields that range from electronics to biology. In particular, graphene has been proposed as an electrode in molecular electronics devices that are expected to be more stable and reproducible than typical ones based on metallic electrodes. In this work, we study by means of first principles, simulations and a tight-binding model the electronic and transport properties of graphene nanogaps with straight edges and different passivating atoms: Hydrogen or elements of the second row of the periodic table (boron, carbon, nitrogen, oxygen, and fluoride). We use the tight-binding model to reproduce the main ab-initio results and elucidate the physics behind the transport properties. We observe clear patterns that emerge in the conductance and the current as one moves from boron to fluoride. In particular, we find that the conductance decreases and the tunneling decaying factor increases from the former to the latter. We explain these trends in terms of the size of the atom and its onsite energy. We also find a similar pattern for the current, which is ohmic and smooth in general. However, when the size of the simulation cell is the smallest one along the direction perpendicular to the transport direction, we obtain highly non-linear behavior with negative differential resistance. This interesting and surprising behavior can be explained by taking into account the presence of Fano resonances and other interference effects, which emerge due to couplings to side atoms at the edges and other couplings across the gap. Such features enter the bias window as the bias increases and strongly affect the current, giving rise to the non-linear evolution. As a whole, these results can be used as a template to understand the transport properties of straight graphene nanogaps and similar systems and distinguish the presence of different elements in the junction. Full article
(This article belongs to the Special Issue Organic Materials for Electronic and Optoelectronic Applications)
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Review

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56 pages, 7034 KiB  
Review
Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review
by Danilo Trapani, Roberto Macaluso, Isodiana Crupi and Mauro Mosca
Materials 2022, 15(15), 5450; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155450 - 08 Aug 2022
Cited by 8 | Viewed by 2780
Abstract
This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump [...] Read more.
This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump wavelength. White LEDs are typically obtained by pumping broad band visible-emitting CDs by an UV LED, or yellow–green-emitting CDs by a blue LED. The most important methods used to produce CDs, top-down and bottom-up, are described in detail, together with the process that allows one to embed the synthetized CDs on the surface of the pumping LEDs. Experimental results show that CDs are very promising ecofriendly candidates with the potential to replace phosphors in traditional color conversion LEDs. The future for these devices is bright, but several goals must still be achieved to reach full maturity. Full article
(This article belongs to the Special Issue Organic Materials for Electronic and Optoelectronic Applications)
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32 pages, 6637 KiB  
Review
Organic Thin-Film Transistors as Gas Sensors: A Review
by Marco Roberto Cavallari, Loren Mora Pastrana, Carlos Daniel Flecha Sosa, Alejandra Maria Rodriguez Marquina, José Enrique Eirez Izquierdo, Fernando Josepetti Fonseca, Cleber Alexandre de Amorim, Leonardo Giordano Paterno and Ioannis Kymissis
Materials 2021, 14(1), 3; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14010003 - 22 Dec 2020
Cited by 32 | Viewed by 6821
Abstract
Organic thin-film transistors (OTFTs) are miniaturized devices based upon the electronic responses of organic semiconductors. In comparison to their conventional inorganic counterparts, organic semiconductors are cheaper, can undergo reversible doping processes and may have electronic properties chiefly modulated by molecular engineering approaches. More [...] Read more.
Organic thin-film transistors (OTFTs) are miniaturized devices based upon the electronic responses of organic semiconductors. In comparison to their conventional inorganic counterparts, organic semiconductors are cheaper, can undergo reversible doping processes and may have electronic properties chiefly modulated by molecular engineering approaches. More recently, OTFTs have been designed as gas sensor devices, displaying remarkable performance for the detection of important target analytes, such as ammonia, nitrogen dioxide, hydrogen sulfide and volatile organic compounds (VOCs). The present manuscript provides a comprehensive review on the working principle of OTFTs for gas sensing, with concise descriptions of devices’ architectures and parameter extraction based upon a constant charge carrier mobility model. Then, it moves on with methods of device fabrication and physicochemical descriptions of the main organic semiconductors recently applied to gas sensors (i.e., since 2015 but emphasizing even more recent results). Finally, it describes the achievements of OTFTs in the detection of important gas pollutants alongside an outlook toward the future of this exciting technology. Full article
(This article belongs to the Special Issue Organic Materials for Electronic and Optoelectronic Applications)
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