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Crystals
Special Issues
Optoelectronics of Thin Films and Nanoparticles (2nd Edition)
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Optoelectronics of Thin Films and Nanoparticles (2nd Edition)

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Materials for Energy Applications".

Deadline for manuscript submissions: 29 November 2024 | Viewed by 705

Special Issue Editors

Prof. Dr. Bouchta Sahraoui

E-Mail Website1 Website2
Guest Editor
1. Nonlinear Optical Group, Institute of Sciences and Molecular Technologies of Angers, University of Angers, MOLTECH Anjou-UMR CNRS, 6200 Angers, France
2. Member of the Hassan II Academy of Science and Technology, Rabat, Morocco
Interests: optical properties of new architectures of nanostructured materials, including advanced polymers for photonics, nonlinear optics, and energy applications; nonlinear optics as a tool for the diagnosis and characterization of specific molecular systems; molecular photonics and light amplification
Special Issues, Collections and Topics in MDPI journals
Dr. Viviana Figà

E-Mail Website
Guest Editor
Euro-Mediterranean Institute of Science and Technology (IEMEST), Via Michele Miraglia 20, 90100 Palermo, Italy
Interests: semiconductors; electrochromic materials; thin films; electrochemical deposition; optoelectronic devices; electrochemical impedance spectroscopy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Light-induced electronic processes have played an important role in technological development. In fact, the interaction between materials and light itself has found a wide field of application in phototransistors, photomultipliers, optical memories, photosensors, photoelectrochemical solar cells, photocatalysis, solar cells, LEDs, electrochromic devices, NLO-based devices, and the photo-induced synthesis of new materials. This attractive field of research is interdisciplinary and involves materials science, physics, chemistry and engineering. Especially in recent decades, materials scientists have focused their efforts on the design and synthesis of new materials, new photonics architectures, and ordered structures at the nano-scale level for improving optoelectronic device performance. In addition, the global need for producing green energy has stimulated research on semiconducting materials to employ in high-efficiency solar cells in order to replace fossil fuels in energy production. Considering the importance of optoelectronics applications from both technological and environmental points of view, we are pleased to invite you to submit your recent research to our Special Issue entitled Optoelectronics of Thin Films and Nanoparticles (2nd edition) for the journal Crystals. The aim of this Special Issue is to collect recent research about materials with promising optoelectronic properties, highlighting recent improvements, new challenges, and future perspectives. Research areas may include (but are not limited to): nanostructures, new synthetic routes for the fabrication of nanoparticles, thin films and liquid crystalline materials, original studies about material characterization and the application of organic, inorganic, and hybrid materials in devices such as solar cells, electrochromic devices, LEDs, photodetectors, optical sensors, etc. This Special Issue aims to open discussions on new findings and to give important suggestions for the development of innovative materials and devices. Reviews about the state of the art of optoelectronic materials and emerging technologies are also welcome.

We look forward to receiving your valuable contributions.

Prof. Dr. Bouchta Sahraoui
Dr. Viviana Figà
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. Crystals 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 2100 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

  • nanoparticles synthesis
  • liquid crystals
  • crystalline supramolecular polymers
  • electrochromism
  • non-linear optical properties
  • metals oxides
  • optoelectronic devices
  • advanced nanomaterials
  • photoconductive materials
  • characterization of optoelectronic materials

Published Papers (2 papers)

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Research

14 pages, 6539 KiB  
Article
Influence of Post-Annealing Treatment on Some Physical Properties of Cerium Oxide Thin Films Prepared by the Sol–Gel Method
by S. M. Al-Shomar
Crystals 2024, 14(7), 615; https://doi.org/10.3390/cryst14070615 - 2 Jul 2024
Viewed by 275
Abstract
In this study, thin films of Cerium Oxide CeO2 were fabricated using the sol–gel technique and deposited onto a glass substrate. The annealing process was carried out at various temperatures ranging from 200 to 600 °C to investigate the structural, morphological, [...] Read more.
In this study, thin films of Cerium Oxide CeO2 were fabricated using the sol–gel technique and deposited onto a glass substrate. The annealing process was carried out at various temperatures ranging from 200 to 600 °C to investigate the structural, morphological, and optical properties of the films and their interrelations. X-ray diffraction (XRD) patterns revealed the crystalline nature of the prepared films, with film quality exhibiting enhancement with increasing annealing temperature. The average crystallite size, dislocation density, microstrain, and lattice constant were determined from XRD patterns. Higher annealing temperatures were found to increase the crystallite size values from 4.71 to 15.33 nm and decrease the dislocation density and microstrain of the unit cell. Scanning electron microscope (SEM) images illustrated the uniformity of the films, presenting a spheroid shape. Optical properties such as transmittance, absorbance, reflectance, the direct band gap, extinction coefficients, the refractive index, and optical conductivity were assessed using optical measurements. The direct optical band gap of the CeO2 film was observed to decrease from 3.99 to 3.75 eV with increasing film thickness. Using the Wemple and DiDomenico (WDD) single-oscillator model, dispersion energy parameters were calculated based on the refractive index. The nonlinear optical properties of the CeO2 thin films were evaluated using these dispersion energy parameters. The improvement of optical parameters holds significance in standardizing CeO2 thin films for various optoelectronic applications. Full article
(This article belongs to the Special Issue Optoelectronics of Thin Films and Nanoparticles (2nd Edition))
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13 pages, 4121 KiB  
Article
The Impact of Curing Temperature and UV Light Intensity on the Performance of Polymer-Dispersed Liquid Crystal Devices Exhibiting a Permanent Memory Effect
by Ana Mouquinho and João Sotomayor
Crystals 2024, 14(6), 571; https://doi.org/10.3390/cryst14060571 - 20 Jun 2024
Viewed by 243
Abstract
PDLC films, synthesized via polymerization-induced phase separation (PIPS) utilizing both temperature and UV monochromatic radiation, were derived from a blend of E7 nematic liquid crystal (LC) and PolyEGDMA875 (polyethyleneglycoldimethacrylate) oligomers, serving as the precursor for the polymeric matrix. The influence of the curing [...] Read more.
PDLC films, synthesized via polymerization-induced phase separation (PIPS) utilizing both temperature and UV monochromatic radiation, were derived from a blend of E7 nematic liquid crystal (LC) and PolyEGDMA875 (polyethyleneglycoldimethacrylate) oligomers, serving as the precursor for the polymeric matrix. The influence of the curing temperature on thermal polymerization, UV light intensity on photochemical polymerization, and exposure time during these processes on the electro-optical characteristics of PDLC films was thoroughly examined. Observations revealed that employing thermal polymerization during device preparation notably enhanced the permanent memory effect of the PDLC films. Sustained high transparency (TOFF = 45%) over an extended duration at room temperature, even subsequent to voltage cessation, was achieved. This transition initiated from an opaque state (T0 = 0%) through to a transparent state (TMAX = 65%), resulting in a substantial 70% permanent memory effect. Full article
(This article belongs to the Special Issue Optoelectronics of Thin Films and Nanoparticles (2nd Edition))
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