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Crystals
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Crystals for Optoelectronics
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Crystals for Optoelectronics

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (15 May 2022) | Viewed by 8108

Special Issue Editors

Dr. Hassan Hafeez

E-Mail Website
Guest Editor
School of Physics & Astronomy, University of St. Andrews, St Andrews Fife KY16 9SS, UK
Interests: stretchable OLEDs; photovoltaics; charge transport
Special Issues, Collections and Topics in MDPI journals
Dr. Sanjoy Paul

E-Mail Website
Co-Guest Editor
Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44240, USA
Interests: materials science, photovoltaics, organic electronics, device physics, thin film technology
Dr. Natalie A Mica

E-Mail Website
Co-Guest Editor
Department of Physics & Astronomy, Univeristy of St Andrews, Scotland, School of Physics and Astronomy, St Andrews, Fife KY16 9SS, UK
Interests: organic semiconductors; perovskites; photovoltaics; energy harvesting; inorganic/organic transport layers
Dr. Adel Shaaban Awad

E-Mail Website
Co-Guest Editor
National Center for Radiation Research (NCRRT), Egypt Atomic Energy Authority, 11787 Cairo, Egypt
Interests: optics, photonics, smart devices, computational and analytical methods.

Special Issue Information

Dear Colleagues,

Optoelectronic devices such as light-emitting diodes, solar cells, photodetectors, and sensors play a significant role in the advancement of our modern civilization with multitude applications in detection technology, lighting, and energy harvesting. The improvement in performance and efficiency of such devices majorly depends on the careful investigation of the optoelectronic properties of the materials, including crystal growth and morphology, bandgap tuning, charge transport, exciton generation and so on. In this Special Issue, titled "Crystal for Optoelectronics", researchers will have the scope to publish their novel findings related to the recent advances in optoelectronics materials and devices, including underlying theory, computations, models, and operating principles. We aim to cover a wide range of optoelectronic materials (both inorganic and organic), including hybrid perovskite materials. Original experimental research including materials development, device architecture, and novel device characterization methodology will be considered. This special issue will also include reviews, brief research reports, and perspectives related to optoelectronic materials and devices.

Dr. Hassan Hafeez
Guest Editors

Dr. Sanjoy Paul
Dr. Natalie A Mica
Dr. Shaaban Adel
Co-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 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

  • Optoelectronics
  • Photo-responsive materials and devices
  • Photonics
  • Light emitting diodes
  • Solar cells
  • Photodetectors
  • Crystalline materials
  • Perovskite materials for energy harvesting
  • Organic/inorganic hybrid materials and devices

Published Papers (3 papers)

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Research

11 pages, 2930 KiB  
Article
Measurement of the Quadratic Electro-Optic Coefficient of KTN Crystal with an Electro-Optic Modulation System in the Presence of Polar Nano-Regions
by Lie-Kun Yang, Bing Liu, Pan-Yu Qiao, Hua-Jian Yu, Xu-Ping Wang, Jing Li, Yu-Guo Yang, Yuan-Yuan Zhang, Cheng-Cheng Qiu and Hua-Di Zhang
Crystals 2021, 11(10), 1234; https://doi.org/10.3390/cryst11101234 - 13 Oct 2021
Cited by 3 | Viewed by 1700
Abstract
An electro-optic modulation system was adopted for measuring the quadratic electro-optic coefficient of KTN crystal. Theoretical analysis and experimental results verified the feasibility of this method. The quadratic electro-optic coefficient of a KTN crystal chip, which has a Curie temperature of 0 °C, [...] Read more.
An electro-optic modulation system was adopted for measuring the quadratic electro-optic coefficient of KTN crystal. Theoretical analysis and experimental results verified the feasibility of this method. The quadratic electro-optic coefficient of a KTN crystal chip, which has a Curie temperature of 0 °C, was measured using this system in the temperature range of 2 °C to 18 °C (Tc = 0 °C). The influences of temperature, AC voltage and frequency on the quadratic electro-optic coefficient were discussed. It was found that the relaxation effect of PNRs (polar nano-regions) played an important role in the determination of the quadratic electro-optic coefficient of KTN crystal. Full article
(This article belongs to the Special Issue Crystals for Optoelectronics)
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17 pages, 6651 KiB  
Article
Mechanical Properties of Pack Carburized SCM 420 Steel Processed Using Natural Shell Powders and Extended Carburization Time
by Ramli, Chung-Chun Wu and Adel Shaaban
Crystals 2021, 11(9), 1136; https://doi.org/10.3390/cryst11091136 - 18 Sep 2021
Cited by 5 | Viewed by 2628
Abstract
The feasibility of using coconut shell powder (CSP) and dog conch shell powder (DCSP) as carburizing media in the pack carburization of SCM 420 steel was investigated. The carbon content and surface hardness of the carburized specimens prepared with different CSP:DCSP ratios and [...] Read more.
The feasibility of using coconut shell powder (CSP) and dog conch shell powder (DCSP) as carburizing media in the pack carburization of SCM 420 steel was investigated. The carbon content and surface hardness of the carburized specimens prepared with different CSP:DCSP ratios and carburizing durations were examined and compared. A CSP:DCSP ratio of 60%:40% and an extended carburizing time of 12 h were found to increase the carbon content of the carburized specimens to 1.14 ± 0.007 wt%. Furthermore, the surface hardness was significantly improved to 961.3 ± 4.918 HV following water quenching. Finally, the thickness of the carburized layer of the quenched specimens increased by around 2.5 times as the carburizing duration was increased from 3 to 12 h. Full article
(This article belongs to the Special Issue Crystals for Optoelectronics)
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11 pages, 2255 KiB  
Article
Kretschmann-Based Optical Sensor via Thermally Tunable Refractive Index
by Hassanein Shaban, Adel Shaaban, Marwa S. Salem, Lotfy Rabeh Gomaa, Mohamed Medhat and Yi-Chun Du
Crystals 2021, 11(6), 616; https://doi.org/10.3390/cryst11060616 - 30 May 2021
Cited by 3 | Viewed by 2414
Abstract
This study discusses whether the prism used in a Kretschmann-based surface plasmon sensor can be fabricated from a thermotropic liquid crystal (TLC) material. The refractive index of the TLC prism can be thermally tuned to match the excitation requirements for the surface plasmon [...] Read more.
This study discusses whether the prism used in a Kretschmann-based surface plasmon sensor can be fabricated from a thermotropic liquid crystal (TLC) material. The refractive index of the TLC prism can be thermally tuned to match the excitation requirements for the surface plasmon modes along the metal–TLC interface of the proposed sensing platform. The TLC material was chemically prepared in vitro and was thermally and optically characterized. The measurements reported a wide mesophase temperature range ΔT (~35 °C) and a relatively high clearing temperature TC (~84 °C) which constitutes a stable thermal control for the TLC optical parameters. The experimentally measured refractive indices of the TLC material reflect a linear change in line with the temperatures at several selected wavelengths in the visible region. A design of the surface plasmon sensor was proposed, which provided a linear response to the investigated analytes refractive index. This work highlights the importance of employing TLC material in designs compatible with detecting refractive index changes by thermal tuning and presents refractive index interrogation as an alternative method for exciting surface plasmon modes. Full article
(This article belongs to the Special Issue Crystals for Optoelectronics)
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