Optoelectronic Devices: From Fundamental Research to Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 2901

Special Issue Editors

School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China
Interests: optoelectronic devices; photodetectors; luminescent solar concentrators; ultrafast spectroscopy; quantum dots; semiconductor nanocrystals; perovskite
Special Issues, Collections and Topics in MDPI journals
Zhejiang Engineering Research Center of MEMS, Shaoxing University, Shaoxing 312000, China
Interests: optoelectronic devices; infrared sensors; organic phototransistors; heterojunction

Special Issue Information

Dear Colleagues,

Optoelectronics is based on the light–matter interactions that convert photons into electrons or vice versa. As shown by the fundamental research and applications of optoelectronic materials in sensing, display, lighting and photon harvesting, optical communicating devices have made rapid progress over the past few decades, owing to the emerging classes of materials, including organic semiconductors, perovskites, and low-dimensional nanomaterials and so on. For these devices, their industrial applications have put forward higher requirements, including smaller sizes, higher speed, higher efficiency, lower power consumption and better stability. This Special Issue aims to showcase research papers, communications, and review articles that focus on exploring the fundamental properties of emerging optoelectronic materials and potential applications in optoelectronic devices. This research topic spans a wide variety of subjects in optoelectronic devices (photodetectors, light-emitting diodes, laser, solar cells, etc.) and integrated systems, including optoelectronic material growth and processing, heterogeneous integration, device architecture and simulation and optical and electronic design. It also focuses on the fundamental understanding of the photo-physical or chemical properties of the involved materials and light–matter interactions, with the aim of unveiling the underlying effects on device performances.

Dr. Xiao Luo
Dr. Bo Yao
Guest Editors

Manuscript Submission Information

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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. Micromachines 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

  • optoelectronic devices
  • photodetectors
  • solar cells
  • LEDs
  • lasers
  • spectroscopy
  • perovskites
  • nanocrystals
  • 2D materials

Published Papers (2 papers)

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Research

15 pages, 2890 KiB  
Article
Metal-Induced Trap States: The Roles of Interface and Border Traps in HfO2/InGaAs
by Huy-Binh Do, Quang-Ho Luc, Phuong V. Pham, Anh-Vu Phan-Gia, Thanh-Son Nguyen, Hoang-Minh Le and Maria Merlyne De Souza
Micromachines 2023, 14(8), 1606; https://doi.org/10.3390/mi14081606 - 15 Aug 2023
Cited by 1 | Viewed by 1477
Abstract
By combining capacitance–voltage measurements, TCAD simulations, and X-ray photoelectron spectroscopy, the impact of the work function of the gate metals Ti, Mo, Pd, and Ni on the defects in bulk HfO2 and at the HfO2/InGaAs interfaces are studied. The oxidation [...] Read more.
By combining capacitance–voltage measurements, TCAD simulations, and X-ray photoelectron spectroscopy, the impact of the work function of the gate metals Ti, Mo, Pd, and Ni on the defects in bulk HfO2 and at the HfO2/InGaAs interfaces are studied. The oxidation at Ti/HfO2 is found to create the highest density of interface and border traps, while a stable interface at the Mo/HfO2 interface leads to the smallest density of traps in our sample. The extracted values of Dit of 1.27 × 1011 eV−1cm−2 for acceptor-like traps and 3.81 × 1011 eV−1cm−2 for donor-like traps are the lowest reported to date. The density and lifetimes of border traps in HfO2 are examined using the Heiman function and strongly affect the hysteresis of capacitance–voltage curves. The results help systematically guide the choice of gate metal for InGaAs. Full article
(This article belongs to the Special Issue Optoelectronic Devices: From Fundamental Research to Applications)
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10 pages, 3098 KiB  
Article
Enhancement of Terahertz Emission by Silver Nanoparticles in a Liquid Medium
by Haoyang Wang, Tao Shen, Jinkun Liu, Yan Zhu, Hong Li and Tianwu Wang
Micromachines 2023, 14(8), 1593; https://doi.org/10.3390/mi14081593 - 13 Aug 2023
Cited by 2 | Viewed by 979
Abstract
Due to higher molecular density, lower ionization potential, and a better self-healing property compared with gases, liquid targets have been used for laser-induced terahertz generation for many years. In this work, a liquid target used for terahertz radiation is embedded with silver nanoparticles [...] Read more.
Due to higher molecular density, lower ionization potential, and a better self-healing property compared with gases, liquid targets have been used for laser-induced terahertz generation for many years. In this work, a liquid target used for terahertz radiation is embedded with silver nanoparticles (Ag NPs), which makes the material have both the fluidity of liquids and conductivity of metals. Meanwhile, the experimental setup is easier to implement than that of liquid metals. Polyvinyl alcohol (PVA) is used as a stabilizing agent to avoid precipitation formation. It is observed that the power of 0.5 THz radiation from the Ag NP suspension is five times stronger than that from liquid water in identical experimental conditions. In addition, the reusability of the material is investigated using multiple excitations. UV–visible spectroscopy and TEM imaging are carried out to analyze the target material after each excitation. As a result, quasispherical Ag NP suspensions show good reusability for several excitations and only a decrease in particle concentration is observed. By contrast, the chain-like Ag NP suspension shows poor stability due to PVA damage caused by intense laser pulses, so it cannot be used in a recyclable manner. Full article
(This article belongs to the Special Issue Optoelectronic Devices: From Fundamental Research to Applications)
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