Optoelectronic Semiconductor Materials and Devices

Dear Colleagues,

Optoelectronic semiconductor materials possess unique properties that allow them to manipulate and control light–matter interactions, making them essential for the development of various optoelectronic devices. These materials find applications in areas such as photonics, solar cells, light-emitting diodes, sensors, and optical communications. Understanding the fundamental properties, fabrication techniques, and performance optimization of these materials is vital for unlocking their full potential and driving further advancements in optoelectronics.

This Special Issue welcomes contributions on a wide range of topics related to optoelectronic semiconductor materials and devices. Potential areas of interest include, but are not limited to, the following:

• Novel synthesis and fabrication methods for optoelectronic materials;
• Characterization techniques for evaluating material properties and device performance;
• Emerging materials and device architectures for improved efficiency and functionality;
• Applications of optoelectronic materials in areas such as photonics, energy harvesting, and sensing;
• Advances in optoelectronic device design, modeling, and simulation.

We invite researchers, scientists, and engineers from around the world to submit their original research papers, reviews, or perspective articles to this Special Issue. By sharing your insights and findings, you will contribute to the collective knowledge and advancement of optoelectronic semiconductor materials and devices.

Dr. Mingjie Li
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. Materials 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 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.

• optoelectronic materials
• device fabrication and characterization
• solar cells
• sensor technology
• light-emitting devices
• material synthesis
• device modeling
• performance optimization

Title: Climatically accelerated material processes determining the long-term reliability of Light Emitting Diodes (LEDs)
Authors: Gabor Harsanyi; Andras Poppe; Janos Hegedüs; Gusztav Hantos; Peter Bojta; Robert Kovacs
Affiliation: Budapest University of Technology and Economics, Dept. of Electronics Technolgy, 3. Műegyetem rkp., 1111 Budapest
Abstract: LEDs (Light Emitting Diodes) gained widespread application not only in decorative illumination but also in the everyday lighting: in buildings, flats, public areas, automotive fields. These applica-tion areas often mean harsh environments, for example, regarding to the humidity content of the surrounding air: besides outdoor and automotive illumination, even the household use cases (kitchen, bathroom, cellar) may represent extreme humidity variations (often reaching relative humidity levels close to 100%) for these devices thus, their reliability behaviour in such circum-stances should be better understood. Moisture, electric, and temperature stress aging tests with appropriate environmental parameter settings were performed as accelerated lifetime tests to in-vestigate not only the effect of temperature but also that of humidity on the aging and reliability of LED packages containing RGB (red green blue) chips and phosphor converted white (pcW) LEDs. The aging was followed not only through monitoring optical/electrical/spectral parameters but also with material analysis. Moisture-material interaction models were proposed and set up. It was found that humidity accelerated aging processes are more severe than expected from previ-ous assumptions. RGB and pcW LEDs showed strongly different behaviour.

Title: The paper presents the results of the study of the morphological and electrical properties of hybrids formed on n-type orientated (100) patterned silicon substrates with resistivity of 2.7 Ohm*cm by organic aryl-substituted carbazole molecules (RB-14, RB-18, RB-22, RB-24, RB-25, RB-27, RB-70, and RB-75). T
Authors: Sergii Mamykin, e-mail is [email protected] Daria Kuznetsova, e-mail is [email protected] Nina Roshchina, e-mail is [email protected] Petro Smertenko, e-mail is [email protected]; Saulius Grigalevicius, e-mail is [email protected] Gintare Krucaite, e-mail is [email protected] Raminta Beresneviciute, e-mail is [email protected]; Simona Sutkuviene, e-mail is [email protected]
Affiliation: V. Lashkaryov Institute of Semiconductor Physics National Academy of Sciences of Ukraine41, prospect Nauky, 03028, Kyiv, Ukraine Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu plentas 19, LT50254 Kaunas, Lithuania Department of Biochemistry, Faculty of Medicine, Lithuanian University of Health Sciences, Tilzes str. 18, 47181 Kaunas, Lithuania
Abstract: A short abstract of our article is: The paper presents the results of the study of the morphological and electrical properties of hybrids formed on n-type orientated (100) patterned silicon substrates with resistivity of 2.7 Ohm*cm by organic aryl-substituted carbazole molecules (RB-14, RB-18, RB-22, RB-24, RB-25, RB-27, RB-70, and RB-75). These organic materials are widely used in the fabrication of organic light-emitting diodes. However, here it is the first time they have been tested in combination with silicon. Thin films with a thickness of about 200 nm based on aryl-substituted carbazoles were obtained by two methods: (i) spin-coating and (ii) self-organization in drops of 1% chloroform solution. Deposition was carried out in a glove-box at room temperature in an inert atmosphere. The layers were deposited for 15 minutes at 500 rpm. High resolution optical microscopy was used to identify morphological features of deposited and self-organized films. Two dominant forms of morphology were found: square-like and network-like, depending on the substituents of the carbazole derivatives. The effect of substituents was analyzed. The current-voltage characteristics were analyzed using a dimensionless sensitivity method and measured using a standard automatic tester It was found that the main mechanism of charge flow in the obtained hybrids is bimolecular recombination. Some of the hybrids showed photoelectric effects. The correspondence between the current-voltage characteristics of the obtained hybrids and the substitution structures of organic compounds based on substituted carbazole derivatives is discussed.