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Special Issue "Opto-Electronic Materials"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 August 2014)

Special Issue Editor

Guest Editor
Dr. David Beljonne (Website)

Université de Mons, Place du Parc, 20, 7000 Mons, Belgium
Interests: molecular modeling; organic electronics; charge and energy transport; electronic processes at interfaces; conjugated polymers and molecules

Special Issue Information

Dear Colleagues,

The field of organic electronics and photonics has now reached a mature stage. Applications, such as light-emitting diodes for displays and white lighting, field effect transistors for electronic circuitry, photovoltaic cells for light conversion into electricity, as well as photodetectors and sensors, have been demonstrated. The tremendous progress that we have witnessed over recent years concerning the quantum efficiency of some of these devices has been driven by the development of new materials. The versatility of organic synthesis in producing tailored, conjugated molecules and polymers, combined with the possibility of preparing thin, light, and flexible films from the liquid or gas phase, has largely contributed to this success.

However, a number of challenges are still ahead of us. Some challenges are fundamental (e.g., boosting charge generation quantum efficiency in organic solar cells or improving the brightness/power consumption tradeoff in organic light-emitting diodes). Other problems are practical (mainly, these concern long-term stability under operating conditions). These challenges call for multidisciplinary research efforts, where the complementary expertise provided by chemists, physicists, engineers, and material scientists is key. Incremental improvements are welcome, but we should also seek breakthroughs fed by new material and device design strategies.

Along these lines, we welcome submissions of original research articles concerning theoretical and experimental physics, as well as synthetic, computational, and physical chemistry and engineering. These articles should aim at: (i) improving our understanding of how these devices work; and (ii) refining the existing rules or identifying new ones for the design of the next generation of organic conjugated materials for opto-electronic applications.

Dr. David Beljonne
Guest Editor

Submission

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. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as 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 refereed through a 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 monthly 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 1400 CHF (Swiss Francs).

Keywords

  • organic electronics
  • synthesis
  • device engineering
  • theory and computational modeling
  • conjugated molecules and polymers
  • photophysics
  • electronic processes at interfaces
  • charge transport, injection and extraction
  • exciton transport and dissociation

Published Papers (3 papers)

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Research

Open AccessCommunication The Challenge of Producing Fiber-Based Organic Electronic Devices
Materials 2014, 7(7), 5254-5267; doi:10.3390/ma7075254
Received: 27 May 2014 / Revised: 11 June 2014 / Accepted: 15 July 2014 / Published: 18 July 2014
Cited by 1 | PDF Full-text (1468 KB) | HTML Full-text | XML Full-text
Abstract
The implementation of organic electronic devices on fibers is a challenging task, not yet investigated in detail. As was shown earlier, a direct transition from a flat device structure to a fiber substrate is in principle possible. However, a more detailed investigation [...] Read more.
The implementation of organic electronic devices on fibers is a challenging task, not yet investigated in detail. As was shown earlier, a direct transition from a flat device structure to a fiber substrate is in principle possible. However, a more detailed investigation of the process reveals additional complexities than just the transition in geometry. It will be shown, that the layer formation of evaporated materials behaves differently due to the multi-angled incidence on the fibers surface. In order to achieve homogenous layers the evaporation process has to be adapted. Additionally, the fiber geometry itself facilitates damaging of its surface due to mechanical impact and leads to a high surface roughness, thereby often hindering commercial fibers to be used as substrates. In this article, a treatment of commercial polymer-coated glass fibers will be demonstrated that allows for the fabrication of rather flexible organic light-emitting diodes (OLEDs) with cylindrical emission characteristics. Since OLEDs rely the most on a smooth substrate, fibers undergoing the proposed treatment are applicable for other organic electronic devices such as transistors and solar cells. Finally, the technique also supports the future fabrication of organic electronics not only in smart textiles and woven electronics but also in bent surfaces, which opens a wide range of applications. Full article
(This article belongs to the Special Issue Opto-Electronic Materials)
Figures

Open AccessArticle Indium Doped Zinc Oxide Thin Films Deposited by Ultrasonic Chemical Spray Technique, Starting from Zinc Acetylacetonate and Indium Chloride
Materials 2014, 7(7), 5038-5046; doi:10.3390/ma7075038
Received: 2 April 2014 / Revised: 8 May 2014 / Accepted: 14 May 2014 / Published: 4 July 2014
Cited by 8 | PDF Full-text (657 KB) | HTML Full-text | XML Full-text
Abstract
The physical characteristics of ultrasonically sprayed indium-doped zinc oxide (ZnO:In) thin films, with electrical resistivity as low as 3.42 × 10−3 Ω·cm and high optical transmittance, in the visible range, of 50%–70% is presented. Zinc acetylacetonate and indium chloride were used [...] Read more.
The physical characteristics of ultrasonically sprayed indium-doped zinc oxide (ZnO:In) thin films, with electrical resistivity as low as 3.42 × 10−3 Ω·cm and high optical transmittance, in the visible range, of 50%–70% is presented. Zinc acetylacetonate and indium chloride were used as the organometallic zinc precursor and the doping source, respectively, achieving ZnO:In thin films with growth rate in the order of 100 nm/min. The effects of both indium concentration and the substrate temperature on the structural, morphological, optical, and electrical characteristics were measured. All the films were polycrystalline, fitting well with hexagonal wurtzite type ZnO. A switching in preferential growth, from (002) to (101) planes for indium doped samples were observed. The surface morphology of the films showed a change from hexagonal slices to triangle shaped grains as the indium concentration increases. Potential applications as transparent conductive electrodes based on the resulting low electrical resistance and high optical transparency of the studied samples are considered. Full article
(This article belongs to the Special Issue Opto-Electronic Materials)
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Open AccessArticle Photostability of 2D Organic-Inorganic Hybrid Perovskites
Materials 2014, 7(6), 4789-4802; doi:10.3390/ma7064789
Received: 11 May 2014 / Revised: 12 June 2014 / Accepted: 13 June 2014 / Published: 20 June 2014
Cited by 10 | PDF Full-text (521 KB) | HTML Full-text | XML Full-text
Abstract
We analyze the behavior of a series of newly synthesized (R-NH3)2PbX4 perovskites and, in particular, discuss the possible reasons which cause their degradation under UV illumination. Experimental results show that the degradation process depends a lot on [...] Read more.
We analyze the behavior of a series of newly synthesized (R-NH3)2PbX4 perovskites and, in particular, discuss the possible reasons which cause their degradation under UV illumination. Experimental results show that the degradation process depends a lot on their molecular components: not only the inorganic part, but also the chemical structure of the organic moieties play an important role in bleaching and photo-chemical reaction processes which tend to destroy perovskites luminescent framework. In addition, we find the spatial arrangement in crystal also influences the photostability course. Following these trends, we propose a plausible mechanism for the photodegradation of the films, and also introduced options for optimized stability. Full article
(This article belongs to the Special Issue Opto-Electronic Materials)

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