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Polymers
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Conjugated Polymers for Organic Electronics and Bioelectronics
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Conjugated Polymers for Organic Electronics and Bioelectronics

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Chemistry".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 9421

Special Issue Editor

Prof. Dr. Jung Yong Kim

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, 378 Jimma, Ethiopia
Interests: organic electronics; bioelectronics; energy materials; electronic materials; organic semiconductor; photovoltaics; polymer science
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Conjugated polymers can transport charges based on sp2pz hybridization of the four balance electrons in the carbon atom with the atomic configuration of 1s22s22p2 or 1s22s12p3, where a partially delocalized pz wavefunction contributes in the formation of π-bonds, yielding electronic and optoelectronic properties. Due to the pz-electron of carbon, π-conjugated (conducting) polymers could function as semiconductors or even metals in photonic, electronic, and spintronic devices such as the organic photovoltaic (OPV) cell, organic light-emitting diode (OLED), polymer laser, organic field-effect transistor (OFET), electrochromic devices, photodetectors, organic spintronics devices, and organic bioelectronic devices (e.g., biosensors and drug delivery systems).       

This Special Issue is concerned with conjugated polymer science and its application in organic electronics and bioelectronics. Here, bioelectronics is an emerging interdisciplinary field, operating at the interface between biology and organic semiconductor electronics. Importantly, when a conjugated polymer contains ionic charges on the backbone, so-called conjugated polyelectrolyte, both ionic and electronic conductions become permissible, which is one material of interest in this issue. Furthermore, when a single conjugated molecule contains two or more conjugated polymers, known as a conjugated block copolymer, the covalent linkages in the polymer-polymer blocks do not allow macrophase separation but microphase separation. Hence, through this separation and accompanying self-assembly, interesting microstructures are generated which may include spherical domains, cylindrical micelles, double gyroid, and lamellae. In general, the phase behaviour of conjugated polymer solutions and blends are topics of interests with the aforementioned state-of-the-art technical applications of conjugated polymers. In this issue, both original contributions and reviews are welcome.  

Prof. Dr. Jung Yong Kim
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. Polymers 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 2700 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

  • Polymer Solar Cell
  • Polymer Photodetector
  • Polymer Light-Emitting Diode
  • Polymer Laser
  • Polymer Field-Effect Transistor
  • Polymer Electrochromic Device
  • Polymer Spintronics
  • Conjugated Polymer
  • Conjugated Polyelectrolyte
  • Conjugated Block Copolymer
  • Polymer Biosensor
  • Bioelectronics

Published Papers (3 papers)

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Research

12 pages, 11583 KiB  
Article
Oriented Thin Films of Insoluble Polythiophene Prepared by the Friction Transfer Technique
by Nobutaka Tanigaki, Chikayo Takechi, Shuichi Nagamatsu, Toshiko Mizokuro and Yuji Yoshida
Polymers 2021, 13(15), 2393; https://doi.org/10.3390/polym13152393 - 21 Jul 2021
Cited by 4 | Viewed by 1948
Abstract
A thin film of unsubstituted polythiophene (PT), an insoluble conjugated polymer, with molecular chains uniaxially oriented in plane was prepared by the friction transfer method. The structure of highly oriented thin films of PT was investigated using grazing-incidence X-ray diffraction (GIXD), ultraviolet–visible (UV–vis) [...] Read more.
A thin film of unsubstituted polythiophene (PT), an insoluble conjugated polymer, with molecular chains uniaxially oriented in plane was prepared by the friction transfer method. The structure of highly oriented thin films of PT was investigated using grazing-incidence X-ray diffraction (GIXD), ultraviolet–visible (UV–vis) spectroscopy, and infrared (IR) spectroscopy. The polarized UV–vis and IR spectra and GIXD measurements showed the PT molecular chains were well aligned in parallel to the friction direction. The GIXD studies clarified that the polymer backbones were aligned with very narrow distribution, such that the half-width was about 4 degrees. The degree of orientation of the PT friction-transferred film was higher compared with those of regioregular poly(3-alkylthiophene)s. Moreover, the GIXD results show a preferred orientation where the a-axis is perpendicular to the substrate plane. Full article
(This article belongs to the Special Issue Conjugated Polymers for Organic Electronics and Bioelectronics)
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13 pages, 4241 KiB  
Article
Complementary Study Based on DFT of Optical and Electronic Properties of New Copolymer PVK-F8T2
by Yasmine Ben Salah, Abeer S. Altowyan, Mohamed Mbarek and Kamel Alimi
Polymers 2021, 13(11), 1805; https://doi.org/10.3390/polym13111805 - 30 May 2021
Cited by 3 | Viewed by 2652
Abstract
This article is mainly a complementary study of a novel part of π-conjugated copolymers based on the poly (N-vinylcarbazole) (PVK) and poly (9,9-dioctylfluorene-co-bithiophene) (F8T2) unit based on the Density Functional Theory (DFT) and Time-Dependent Density Functional Theory (TD-DFT). This study is carried out [...] Read more.
This article is mainly a complementary study of a novel part of π-conjugated copolymers based on the poly (N-vinylcarbazole) (PVK) and poly (9,9-dioctylfluorene-co-bithiophene) (F8T2) unit based on the Density Functional Theory (DFT) and Time-Dependent Density Functional Theory (TD-DFT). This study is carried out to explore the structural and optoelectronic characteristics of a new organic material named PVK-F8T2. First, the structural, optical (absorption, photoluminescence, optical transition), electronic (molecular orbital (MO), energy-level diagram) and vibratory parameters of infrared (IR) were computed and compared with experimental studies. In addition, we calculated the level energy of the excited states and their corresponding transitions. Obviously, electronic parameters such as highest occupied and lowest unoccupied molecular orbital (HOMO and LUMO), ionization potential (IP), electronic affinity (EA) and the energy band gap (Eg) were computed in order to elucidate the intramolecular charge transport and to establish the energetic diagrams of the PVK-F8T2 copolymer for different states. The results obtained looked with precision at future optoelectronic applications. From these results, we have shown that the PVK-F8T2 has significant optoelectronic properties and seems usable as an active layer in organic light-emitting diodes (OLEDs). Full article
(This article belongs to the Special Issue Conjugated Polymers for Organic Electronics and Bioelectronics)
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15 pages, 5067 KiB  
Article
Phase Diagrams of Ternary π-Conjugated Polymer Solutions for Organic Photovoltaics
by Jung Yong Kim
Polymers 2021, 13(6), 983; https://doi.org/10.3390/polym13060983 - 23 Mar 2021
Cited by 10 | Viewed by 4113
Abstract
Phase diagrams of ternary conjugated polymer solutions were constructed based on Flory-Huggins lattice theory with a constant interaction parameter. For this purpose, the poly(3-hexylthiophene-2,5-diyl) (P3HT) solution as a model system was investigated as a function of temperature, molecular weight (or chain length), solvent [...] Read more.
Phase diagrams of ternary conjugated polymer solutions were constructed based on Flory-Huggins lattice theory with a constant interaction parameter. For this purpose, the poly(3-hexylthiophene-2,5-diyl) (P3HT) solution as a model system was investigated as a function of temperature, molecular weight (or chain length), solvent species, processing additives, and electron-accepting small molecules. Then, other high-performance conjugated polymers such as PTB7 and PffBT4T-2OD were also studied in the same vein of demixing processes. Herein, the liquid-liquid phase transition is processed through the nucleation and growth of the metastable phase or the spontaneous spinodal decomposition of the unstable phase. Resultantly, the versatile binodal, spinodal, tie line, and critical point were calculated depending on the Flory-Huggins interaction parameter as well as the relative molar volume of each component. These findings may pave the way to rationally understand the phase behavior of solvent-polymer-fullerene (or nonfullerene) systems at the interface of organic photovoltaics and molecular thermodynamics. Full article
(This article belongs to the Special Issue Conjugated Polymers for Organic Electronics and Bioelectronics)
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