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Special Issue "Advances in Organic Nanophotonics"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Photochemistry".

Deadline for manuscript submissions: closed (30 November 2016)

Special Issue Editors

Guest Editor
Prof. Dr. Youngkyoo Kim

Organic Nanoelectronics Laboratory, Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu, South Korea
Website | E-Mail
Interests: organic photonics/electronics; functional molecules/polymers; energy materials/devices; biomedical materials/devices
Guest Editor
Dr. Hwajeong Kim

Organic Nanoelectronics Laboratory, Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu, South Korea
E-Mail
Interests: electrochemical sensors/systems; biomedical materials/devices; organic materials/devices; nanoscale surfaces/analysis

Special Issue Information

Dear Colleagues,

Organic functional molecules play a core role in creating innovative properties for a variety of material systems and device applications because of their versatility and tuning potentials via chemical synthesis. In particular, advances in nanotechnology and photonics enable organic functional molecules to extend their roles toward a sophisticated nanoscale photonics (nanophotonics), which is a challenging category for increasing the current limitations of optoelectronic and photonic systems. In addition, organic nanophotonics are considered critical constituents in order to complete flexible electronics, which are a new paradigm in transition. This Special Issue aims to deliver an active forum for very recent advances in organic nanophotonics including novel organic photonic molecules, organic nanophotonic devices, nanophotonic systems with organic molecules, biomedical applications of organic nanophotonic devices, organic nanophotonic materials and devices for energy and environmental applications, etc.

Prof. Dr. Youngkyoo Kim
Dr. Hwajeong Kim
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 papers will be 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. Molecules 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 1800 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 nanophotonics
  • organic functional molecules
  • nanophotonic systems
  • biomedical applications
  • energy and environments

Published Papers (5 papers)

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Research

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Open AccessArticle A Study on the Electro-Optical Properties of Thiol-Ene Polymer Dispersed Cholesteric Liquid Crystal (PDChLC) Films
Molecules 2017, 22(2), 317; doi:10.3390/molecules22020317
Received: 1 December 2016 / Revised: 2 February 2017 / Accepted: 9 February 2017 / Published: 22 February 2017
Cited by 1 | PDF Full-text (4582 KB) | HTML Full-text | XML Full-text
Abstract
In this study, a polymer dispersed cholesteric liquid crystal (PDChLC) film obtained via a one-step fabrication technique based on photopolymerization of a thiol-acrylate reaction system was prepared and characterized for the first time. The effects of the chiral dopant, the influence of thiol
[...] Read more.
In this study, a polymer dispersed cholesteric liquid crystal (PDChLC) film obtained via a one-step fabrication technique based on photopolymerization of a thiol-acrylate reaction system was prepared and characterized for the first time. The effects of the chiral dopant, the influence of thiol monomer functionality and content on the morphology and subsequent performance of the PDChLC films were systematically investigated. It was demonstrated that the addition of a small amount of chiral dopant slightly increased the driving voltage, but decreased the off-state transmittance significantly. Furthermore, scanning electron micrographs (SEM) shown that the liquid crystal (LC) droplet size decreased at first and then increased with the increasing amount of thiol monomer functionality, while increasing the thiol content increased the LC droplet size. Correspondingly, the electro-optical switching behavior was directly dependent on LC droplet size. By tuning the raw material composition, PDChLC film with optimized electro-optical performance was prepared. Full article
(This article belongs to the Special Issue Advances in Organic Nanophotonics)
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Open AccessCommunication An Easy Approach to Control β-Phase Formation in PFO Films for Optimized Emission Properties
Molecules 2017, 22(2), 315; doi:10.3390/molecules22020315
Received: 11 January 2017 / Revised: 7 February 2017 / Accepted: 14 February 2017 / Published: 18 February 2017
PDF Full-text (1486 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
We demonstrate a novel approach to control β-phase content generated in poly(9,9-dioctylfluorene) (PFO) films. A very small amount of paraffin oil was used as the additive to the PFO solution in toluene. The β-phase fraction in the spin-coated PFO films can be modified
[...] Read more.
We demonstrate a novel approach to control β-phase content generated in poly(9,9-dioctylfluorene) (PFO) films. A very small amount of paraffin oil was used as the additive to the PFO solution in toluene. The β-phase fraction in the spin-coated PFO films can be modified from 0% to 20% simply by changing the volume percentage of paraffin oil in the mixed solution. Organic light emitting diodes (OLEDs) and amplified spontaneous emission (ASE) study confirmed low β-phase fraction promise better OLEDs device, while high β-phase fraction benefits ASE performance. Full article
(This article belongs to the Special Issue Advances in Organic Nanophotonics)
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Open AccessArticle Influence of Weak Base Addition to Hole-Collecting Buffer Layers in Polymer:Fullerene Solar Cells
Molecules 2017, 22(2), 262; doi:10.3390/molecules22020262
Received: 13 January 2017 / Accepted: 4 February 2017 / Published: 9 February 2017
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Abstract
We report the effect of weak base addition to acidic polymer hole-collecting layers in normal-type polymer:fullerene solar cells. Varying amounts of the weak base aniline (AN) were added to solutions of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The acidity of the aniline-added PEDOT:PSS solutions gradually decreased from
[...] Read more.
We report the effect of weak base addition to acidic polymer hole-collecting layers in normal-type polymer:fullerene solar cells. Varying amounts of the weak base aniline (AN) were added to solutions of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The acidity of the aniline-added PEDOT:PSS solutions gradually decreased from pH = 1.74 (AN = 0 mol% ) to pH = 4.24 (AN = 1.8 mol %). The electrical conductivity of the PEDOT:PSS-AN films did not change much with the pH value, while the ratio of conductivity between out-of-plane and in-plane directions was dependent on the pH of solutions. The highest power conversion efficiency (PCE) was obtained at pH = 2.52, even though all devices with the PEDOT:PSS-AN layers exhibited better PCE than those with the pristine PEDOT:PSS layers. Atomic force microscopy investigation revealed that the size of PEDOT:PSS domains became smaller as the pH increased. The stability test for 100 h illumination under one sun condition disclosed that the PCE decay was relatively slower for the devices with the PEDOT:PSS-AN layers than for those with pristine PEDOT:PSS layers. Full article
(This article belongs to the Special Issue Advances in Organic Nanophotonics)
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Open AccessArticle Effect of a Polymercaptan Material on the Electro-Optical Properties of Polymer-Dispersed Liquid Crystal Films
Molecules 2017, 22(1), 43; doi:10.3390/molecules22010043
Received: 1 December 2016 / Revised: 21 December 2016 / Accepted: 27 December 2016 / Published: 30 December 2016
Cited by 1 | PDF Full-text (6750 KB) | HTML Full-text | XML Full-text
Abstract
Polymer-dispersed liquid crystal (PDLC) films were prepared by the ultraviolet-light-induced polymerization of photopolymerizable monomers in nematic liquid crystal/chiral dopant/thiol-acrylate reaction monomer composites. The effects of the chiral dopant and crosslinking agents on the electro-optical properties of the PDLC films were systematically investigate. While
[...] Read more.
Polymer-dispersed liquid crystal (PDLC) films were prepared by the ultraviolet-light-induced polymerization of photopolymerizable monomers in nematic liquid crystal/chiral dopant/thiol-acrylate reaction monomer composites. The effects of the chiral dopant and crosslinking agents on the electro-optical properties of the PDLC films were systematically investigate. While added the chiral dopant S811 into the PDLC films, the initial off-state transmittance of the films was decreased. It was found that the weight ratio among acrylate monomers, thiol monomer PETMP and the polymercaptan Capcure 3-800 showed great influence on the properties of the fabricated PDLC films because of the existence of competition between thiol-acrylate reaction and acrylate monomer polymerization reaction. While adding polymercaptans curing agent Capcure 3-800 with appropriate concentration into the PDLC system, lower driven voltage and higher contrast ratio were achieved. This made the polymer network and electro-optical properties of the PDLC films easily tunable by the introduction of the thiol monomers. Full article
(This article belongs to the Special Issue Advances in Organic Nanophotonics)
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Review

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Open AccessReview Morphology Analysis and Optimization: Crucial Factor Determining the Performance of Perovskite Solar Cells
Molecules 2017, 22(4), 520; doi:10.3390/molecules22040520
Received: 21 January 2017 / Revised: 9 March 2017 / Accepted: 21 March 2017 / Published: 24 March 2017
Cited by 3 | PDF Full-text (11549 KB) | HTML Full-text | XML Full-text
Abstract
This review presents an overall discussion on the morphology analysis and optimization for perovskite (PVSK) solar cells. Surface morphology and energy alignment have been proven to play a dominant role in determining the device performance. The effect of the key parameters such as
[...] Read more.
This review presents an overall discussion on the morphology analysis and optimization for perovskite (PVSK) solar cells. Surface morphology and energy alignment have been proven to play a dominant role in determining the device performance. The effect of the key parameters such as solution condition and preparation atmosphere on the crystallization of PVSK, the characterization of surface morphology and interface distribution in the perovskite layer is discussed in detail. Furthermore, the analysis of interface energy level alignment by using X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy is presented to reveals the correlation between morphology and charge generation and collection within the perovskite layer, and its influence on the device performance. The techniques including architecture modification, solvent annealing, etc. were reviewed as an efficient approach to improve the morphology of PVSK. It is expected that further progress will be achieved with more efforts devoted to the insight of the mechanism of surface engineering in the field of PVSK solar cells. Full article
(This article belongs to the Special Issue Advances in Organic Nanophotonics)
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