Recent Advances in Organic Electronics and Novel Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E:Engineering and Technology".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 14453

Special Issue Editors


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Guest Editor
Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
Interests: organic electronics; flexible electronics; soft electronics; bioelectronics
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Guest Editor
Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
Interests: organic electronics; wearable electronics; bioelectronics

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Guest Editor
Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
Interests: stretchable electronics; thin-film transistors; polymer matrix composites; high-k dielectrics

Special Issue Information

Dear Colleagues,

Organic electronics have attracted much attention owing to their inherent material advantages such as flexibility/stretchability, large-scale processability, biocompatibility, and functional versatility. Including the profoundly commercialized organic light emitting diodes, various organic devices including photodetectors, photovoltaics, transistors, sensors are emerging as a complement to the conventional inorganic counterparts and/or as pioneers of the previously unavailable applications such as wearables and bioelectronics. To achieve these application-driven goals, in-depth understanding of the materials synthesis, device fabrication and operation physics are mandatory.

This Special Issue will serve as a forum for research papers and review articles in the following concepts, but not limited to these:

  • Advanced materials for organic electronics
  • Novel fabrication techniques for organic electronics
  • Device physics of organic electronics
  • On-demand applications of organic electronics

Dr. Sunghoon Lee
Dr. Jaejoon Kim
Dr. Binghao Wang
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. Micromachines 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 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

  • Organic Transistors
  • Organic Photodetectors
  • Organic Photovoltaics
  • Organic Light Emitting Diodes
  • Organic Sensors

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Published Papers (3 papers)

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Research

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11 pages, 6697 KiB  
Article
Effect of Optical and Morphological Control of Single-Structured LEC Device
by Woo Jin Jeong, Jong Ik Lee, Hee Jung Kwak, Jae Min Jeon, Dong Yeol Shin, Moon Sung Kang and Jun Young Kim
Micromachines 2021, 12(7), 843; https://doi.org/10.3390/mi12070843 - 19 Jul 2021
Viewed by 2068
Abstract
We investigated the performance of single-structured light-emitting electrochemical cell (LEC) devices with Ru(bpy)3(PF6)2 polymer composite as an emission layer by controlling thickness and heat treatment. When the thickness was smaller than 120–150 nm, the device performance decreased because [...] Read more.
We investigated the performance of single-structured light-emitting electrochemical cell (LEC) devices with Ru(bpy)3(PF6)2 polymer composite as an emission layer by controlling thickness and heat treatment. When the thickness was smaller than 120–150 nm, the device performance decreased because of the low optical properties and non-dense surface properties. On the other hand, when the thickness was over than 150 nm, the device had too high surface roughness, resulting in high-efficiency roll-off and poor device stability. With 150 nm thickness, the absorbance increased, and the surface roughness was low and dense, resulting in increased device characteristics and better stability. The heat treatment effect further improved the surface properties, thus improving the device characteristics. In particular, the external quantum efficiency (EQE) reduction rate was shallow at 100 °C, which indicates that the LEC device has stable operating characteristics. The LEC device exhibited a maximum luminance of 3532 cd/m2 and an EQE of 1.14% under 150 nm thickness and 100 °C heat treatment. Full article
(This article belongs to the Special Issue Recent Advances in Organic Electronics and Novel Applications)
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6 pages, 1372 KiB  
Communication
Hysteresis Behavior of the Donor–Acceptor-Type Ambipolar Semiconductor for Non-Volatile Memory Applications
by Young Jin Choi, Jihyun Kim, Min Je Kim, Hwa Sook Ryu, Han Young Woo, Jeong Ho Cho and Joohoon Kang
Micromachines 2021, 12(3), 301; https://doi.org/10.3390/mi12030301 - 12 Mar 2021
Cited by 3 | Viewed by 2299
Abstract
Donor–acceptor-type organic semiconductor molecules are of great interest for potential organic field-effect transistor applications with ambipolar characteristics and non-volatile memory applications. Here, we synthesized an organic semiconductor, PDPPT-TT, and directly utilized it in both field-effect transistor and non-volatile memory applications. As-synthesized PDPPT-TT was [...] Read more.
Donor–acceptor-type organic semiconductor molecules are of great interest for potential organic field-effect transistor applications with ambipolar characteristics and non-volatile memory applications. Here, we synthesized an organic semiconductor, PDPPT-TT, and directly utilized it in both field-effect transistor and non-volatile memory applications. As-synthesized PDPPT-TT was simply spin-coated on a substrate for the device fabrications. The PDPPT-TT based field-effect transistor showed ambipolar electrical transfer characteristics. Furthermore, a gold nanoparticle-embedded dielectric layer was used as a charge trapping layer for the non-volatile memory device applications. The non-volatile memory device showed clear memory window formation as applied gate voltage increases, and electrical stability was evaluated by performing retention and cycling tests. In summary, we demonstrate that a donor–acceptor-type organic semiconductor molecule shows great potential for ambipolar field-effect transistors and non-volatile memory device applications as an important class of materials. Full article
(This article belongs to the Special Issue Recent Advances in Organic Electronics and Novel Applications)
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Review

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30 pages, 4246 KiB  
Review
Advanced Flexible Skin-Like Pressure and Strain Sensors for Human Health Monitoring
by Xu Liu, Yuan Wei and Yuanying Qiu
Micromachines 2021, 12(6), 695; https://doi.org/10.3390/mi12060695 - 14 Jun 2021
Cited by 60 | Viewed by 9274
Abstract
Recently, owing to their excellent flexibility and adaptability, skin-like pressure and strain sensors integrated with the human body have the potential for great prospects in healthcare. This review mainly focuses on the representative advances of the flexible pressure and strain sensors for health [...] Read more.
Recently, owing to their excellent flexibility and adaptability, skin-like pressure and strain sensors integrated with the human body have the potential for great prospects in healthcare. This review mainly focuses on the representative advances of the flexible pressure and strain sensors for health monitoring in recent years. The review consists of five sections. Firstly, we give a brief introduction of flexible skin-like sensors and their primary demands, and we comprehensively outline the two categories of design strategies for flexible sensors. Secondly, combining the typical sensor structures and their applications in human body monitoring, we summarize the recent development of flexible pressure sensors based on perceptual mechanism, the sensing component, elastic substrate, sensitivity and detection range. Thirdly, the main structure principles and performance characteristic parameters of noteworthy flexible strain sensors are summed up, namely the sensing mechanism, sensitive element, substrate, gauge factor, stretchability, and representative applications for human monitoring. Furthermore, the representations of flexible sensors with the favorable biocompatibility and self-driven properties are introduced. Finally, in conclusion, besides continuously researching how to enhance the flexibility and sensitivity of flexible sensors, their biocompatibility, versatility and durability should also be given sufficient attention, especially for implantable bioelectronics. In addition, the discussion emphasizes the challenges and opportunities of the above highlighted characteristics of novel flexible skin-like sensors. Full article
(This article belongs to the Special Issue Recent Advances in Organic Electronics and Novel Applications)
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