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Crystals
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Semiconductor Nanocrystal Studies for Optoelectronic Applications
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Semiconductor Nanocrystal Studies for Optoelectronic Applications

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

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 6645

Special Issue Editors

Prof. Dr. Hao-chung Kuo

E-Mail Website
Guest Editor
Department of Photonics & Graduate Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Interests: nanostructured optoelectronic materials and devices; III-V (nitride); high-speed semiconductor laser technology; nanocrystals; quantum dots; VCSEL; quantum well; LEDs
Special Issues, Collections and Topics in MDPI journals
Dr. Yu-Heng Hong

E-Mail Website
Guest Editor
Semiconductor Research Center, Hon Hai Research Institute, Taipei 11492, Taiwan
Interests: metasurfaces; nanophotonics; finite-difference time-domain method; random lasers; perovskite

Special Issue Information

Dear Colleagues,

The field of semiconductor nanocrystal studies has witnessed remarkable advancements in recent years, heralding a new era of possibilities for optoelectronic applications. Semiconductor nanocrystals, also known as quantum dots, possess unique size-dependent optical and electronic properties that can be precisely engineered by controlling their size, shape, and composition. These remarkable nanoscale crystals exhibit quantum confinement effects, enabling them to emit, absorb, and manipulate light with unprecedented efficiency and versatility. As a result, they hold immense potential for a wide range of optoelectronic applications, including, but not limited to, displays, lighting, solar cells, sensors, and biomedical imaging.

This Special Issue will feature cutting-edge research articles that delve into the fundamental aspects of nanocrystal synthesis, characterization techniques, and theoretical modeling, providing a solid foundation for advancing our understanding of their unique properties. Furthermore, it will explore the integration of nanocrystals into devices and showcase their performance in real-world applications, thereby bridging the gap between fundamental research and practical implementation.

It is anticipated that the findings presented in this Special Issue will not only contribute to the field of crystallography but also inspire new avenues of research and innovation, ultimately shaping the future of optoelectronics. Join us on this journey to unravel the mysteries of semiconductor nanocrystals and unlock their immense potential for revolutionizing the world of optoelectronics. Submit your groundbreaking research and insightful reviews to be part of this exciting Special Issue of the journal Crystals.

Prof. Dr. Hao-chung Kuo
Dr. Yu-Heng Hong
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

  • semiconductor nanocrystals
  • nanostructured optoelectronics
  • quantum dots
  • light-emitting diodes
  • organic photovoltaics
  • perovskite light-emitting diodes
  • optoelectronic devices
  • quantum wells

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

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8 pages, 9329 KiB  
Article
Oxidized Graphite Nanocrystals for White Light Emission
by Patrik Ščajev, Saulius Miasojedovas, Algirdas Mekys, Gediminas Kreiza, Justinas Čeponkus, Valdas Šablinskas, Tadas Malinauskas and Arturs Medvids
Crystals 2024, 14(6), 505; https://doi.org/10.3390/cryst14060505 - 25 May 2024
Viewed by 1445
Abstract
We investigated the formation of graphite nanocrystals covered with graphite oxide for white light generation. The nanoparticles were formed using cost-efficient oxidation of a carbon-based dye pigment at different temperatures and verified using X-ray diffraction and Raman measurements. Formation of the graphite nanoparticles [...] Read more.
We investigated the formation of graphite nanocrystals covered with graphite oxide for white light generation. The nanoparticles were formed using cost-efficient oxidation of a carbon-based dye pigment at different temperatures and verified using X-ray diffraction and Raman measurements. Formation of the graphite nanoparticles via thermal annealing was observed, while their light emission increased at higher oxidation temperatures. This was associated with a higher amount of oxygen defect groups. The time-resolved photoluminescence measurements showed linearly faster decays at shorter wavelengths and similar decays at different annealing temperatures. Broadband and linear vs. excitation emission spectra of the particles were found to be suitable for white-light-emitting devices and phosphor markers. The fast photoluminescence decay opens the possibility for the application of nanoparticles in optical wireless communication technology. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystal Studies for Optoelectronic Applications)
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13 pages, 3952 KiB  
Article
Optimized Design with Artificial Intelligence Quantum Dot White Mini LED Backlight Module Development
by Tzu-Yi Lee, Wei-Ta Huang, Jo-Hsiang Chen, Wei-Bo Liu, Shu-Wei Chang, Fang-Chung Chen and Hao-Chung Kuo
Crystals 2023, 13(10), 1411; https://doi.org/10.3390/cryst13101411 - 22 Sep 2023
Cited by 2 | Viewed by 2175
Abstract
This study delves into the innovation of mini light-emitting diode (mini-LED) backlight module designs, a significant advancement in display technology. The module comprises a substrate, a receiving plane, and an LED structure, which uses a blue light with specific spectral characteristics. When combined [...] Read more.
This study delves into the innovation of mini light-emitting diode (mini-LED) backlight module designs, a significant advancement in display technology. The module comprises a substrate, a receiving plane, and an LED structure, which uses a blue light with specific spectral characteristics. When combined with a red-green quantum dot (QD) film, it produces white light. For improved illumination uniformity, the Mini-LED structure was optimized with a focus on the thickness and concentration of layers, especially the TiO2 diffusion layer. A comprehensive design methodology using LightTools (8.6.0) optical simulation software was employed, linked with MATLAB (R2022a) for varied parameters and using the double deep Q-network (DDQN) algorithm via Python as a reinforcement learning agent. This approach facilitated optimal architecture design based on illumination uniformity. Also, the bidirectional scattering distribution function (BSDF) was employed to calculate the scattering properties of the backlight module’s surface, providing accurate simulation results. The DDQN algorithm enhanced the learning design, reducing simulation runs by 76.7% compared to traditional methods. The optimized solution achieved an impressive illumination uniformity of 83.8%, underscoring the benefits of integrating advanced algorithms into display technology optimization. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystal Studies for Optoelectronic Applications)
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Review

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38 pages, 22809 KiB  
Review
Nanoscale Cu2ZnSnSxSe(4−x) (CZTS/Se) for Sustainable Solutions in Renewable Energy, Sensing, and Nanomedicine
by Sayedmahdi Mohammadi, Navdeep Kaur and Daniela R. Radu
Crystals 2024, 14(5), 479; https://doi.org/10.3390/cryst14050479 - 19 May 2024
Viewed by 2331
Abstract
The importance and breadth of applications of the family of quaternary chalcogenides with the formula Cu2ZnSnSxSe(4−x) (CZTS/Se) where x = 0–4 are steadily expanding due to the tunable optoelectronic properties of these compounds and the Earth abundance of [...] Read more.
The importance and breadth of applications of the family of quaternary chalcogenides with the formula Cu2ZnSnSxSe(4−x) (CZTS/Se) where x = 0–4 are steadily expanding due to the tunable optoelectronic properties of these compounds and the Earth abundance of the elements in their composition. These p-type semiconductors are viewed as a viable alternative to Si, gallium arsenide, CdTe, and CIGS solar cells due to their cost effectiveness, Earth’s crust abundance, and non-toxic elements. Additionally, CZTS/Se compounds have demonstrated notable capabilities beyond solar cells, such as photoelectrochemical CO2 reduction, solar water splitting, solar seawater desalination, hydrogen production, and use as an antibacterial agent. Various routes have been explored for synthesizing pure CZTS/Se nanomaterials and significant efforts have been dedicated to reducing the occurrence of secondary phases. This review focuses on synthetic approaches for CZTS/Se nanomaterials, with emphasis on controlling the size and morphology of the nanoparticles and their recent application in solar energy harvesting and beyond, highlighting challenges in achieving the desired purity required in all these applications. Full article
(This article belongs to the Special Issue Semiconductor Nanocrystal Studies for Optoelectronic Applications)
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