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Photonics
Special Issues
Optoelectronic Materials and Their Applications
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Optoelectronic Materials and Their Applications

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optoelectronics and Optical Materials".

Deadline for manuscript submissions: closed (1 April 2021) | Viewed by 8388

Special Issue Editor

Prof. Dr. Tien-Lung Chiu

E-Mail Website
Guest Editor
Department of Electrical Engineering, Yuan Ze University, Chung-Li, Taoyuan, Taiwan
Interests: material science; optics and photonics; metal-oxide materials; quantum-dot semiconductor; organic semiconductor; organic optoelectronics; nanotechnologies; nanomaterials; display technologies; solar energy

Special Issue Information

Dear Colleagues,

Over the past 20 years, a variety of materials have been developed for optoelectronic applications. This Special Issue focuses on the most recent advances in the study of optoelectronic materials and their applications in relevant devices, such as photovoltaics, light-emitting diodes, and photonic crystal devices, though the scope of this Special Issue is not limited to them. With this goal, we strongly encourage the submission of articles related to emerging materials for optoelectronics and their device applications.

Dr. Tien-Lung Chiu
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. Photonics 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 2400 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

  • photonics
  • optoelectronics
  • emerging materials for optoelectronics
  • semiconductors
  • photovoltaics
  • light-emitting diodes
  • quantum dot
  • nanostructure

Published Papers (3 papers)

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Research

9 pages, 1865 KiB  
Article
Cobalt and Carbon Complex as Counter Electrodes in Dye-Sensitized Solar Cells
by Chi-Feng Lin, Ting-Hsuan Hsieh, Yu-Chen Chou, Pin-Hung Chen, Ci-Wun Chen and Chun-Han Wu
Photonics 2021, 8(5), 166; https://doi.org/10.3390/photonics8050166 - 19 May 2021
Cited by 5 | Viewed by 1745
Abstract
We developed cobalt and carbon complex materials as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) to replace conventional platinum (Pt) CEs. Co12 and Co15, both of which are basic cobalt derivatives, showed good redox potential with a suitable open-circuit voltage (VOC [...] Read more.
We developed cobalt and carbon complex materials as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) to replace conventional platinum (Pt) CEs. Co12 and Co15, both of which are basic cobalt derivatives, showed good redox potential with a suitable open-circuit voltage (VOC); however, their poor electrical conductivity engendered a low short-circuit current (JSC) and fill factor (FF). Mixing them with carbon black (CB) improved the electrical conductivity of the CE; in particular, JSC and FF were considerably improved. Further improvement was achieved by combining cobalt derivatives and CB through thermal sintering to produce a novel CoCB material as a CE. CoCB had good electrical conductivity and electrocatalytic capability, and this further enhanced both JSC and VOC. The optimized device exhibited a power conversion efficiency (PCE) of 7.44%, which was higher than the value of 7.16% for a device with a conventional Pt CE. The conductivity of CoCB could be further increased by mixing it with PEDOT:PSS, a conducting polymer. The device’s JSC increased to 18.65 mA/cm2, which was considerably higher than the value of 14.24 mA/cm2 for the device with Pt CEs. The results demonstrate the potential of the cobalt and carbon complex as a CE for DSSCs. Full article
(This article belongs to the Special Issue Optoelectronic Materials and Their Applications)
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8 pages, 1666 KiB  
Article
Effect of Carrier-Transporting Layer on Blue Phosphorescent Organic Light-Emitting Diodes
by Bo-Yen Lin, Chia-Hsun Chen, Tzu-Chan Lin, Jiun-Haw Lee and Tien-Lung Chiu
Photonics 2021, 8(4), 124; https://doi.org/10.3390/photonics8040124 - 15 Apr 2021
Cited by 1 | Viewed by 3375
Abstract
This study presented the effects of carrier-transporting layer (CTL) on electroluminescence (EL) performance of a blue phosphorescent organic light-emitting diodes (PHOLEDs) with electron transporting host based on three kinds of electron-transporting layers (ETLs) including 3-(4-biphenyl-yl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole (TAZ), diphenyl-bis[4-(pyridin-3-yl)phenyl]silane (DPPS) and 1,3,5-tri(m-pyrid-3-yl-phenyl)benzene (TmPyPB) and two [...] Read more.
This study presented the effects of carrier-transporting layer (CTL) on electroluminescence (EL) performance of a blue phosphorescent organic light-emitting diodes (PHOLEDs) with electron transporting host based on three kinds of electron-transporting layers (ETLs) including 3-(4-biphenyl-yl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole (TAZ), diphenyl-bis[4-(pyridin-3-yl)phenyl]silane (DPPS) and 1,3,5-tri(m-pyrid-3-yl-phenyl)benzene (TmPyPB) and two kinds of hole-transporting layers (HTLs) such as 4,4′-bis[N-1-naphthyl-N-phenyl-amino]biphenyl (NPB), 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC). The carrier recombination and exciton formation zones in blue PHOLEDs strongly depend on the carrier mobility of CTLs and the layer thickness, especially the carrier mobility. Between ETLs and HTLs, the high electron mobility of ETL results in a lower driving voltage in blue PHOLEDs than the high hole mobility of HTL did. In addition, layer thickness modulation is an effective approach to precisely control carriers and restrict carriers within the EML and avoid a leakage emission of CTL. For CTL pairs in OLEDs using the electron transporting host system, ETLs with low mobility and also HTLs with high hole mobility are key points to confine the charge in EML for efficient photon emission. These findings show that appropriate CTL pairs and good layer thickness are essential for efficient OLEDs. Full article
(This article belongs to the Special Issue Optoelectronic Materials and Their Applications)
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7 pages, 1773 KiB  
Communication
Laser-Induced Thermal Annealing of CH3NH3PbI3 Perovskite Microwires
by Xiaoming Chen, Zixian Wang, Ren-Jie Wu, Horng-Long Cheng and Hsiang-Chen Chui
Photonics 2021, 8(2), 30; https://doi.org/10.3390/photonics8020030 - 26 Jan 2021
Cited by 4 | Viewed by 2584
Abstract
Perovskite microwires have a larger surface-to-volume ratio and better photoelectric conversion efficiency than perovskite films. The degree of crystallization also affects the optoelectrical performances of perovskite microwires. Laser annealing was regarded as a tool for crystallization. High light absorption induced fast heating process. [...] Read more.
Perovskite microwires have a larger surface-to-volume ratio and better photoelectric conversion efficiency than perovskite films. The degree of crystallization also affects the optoelectrical performances of perovskite microwires. Laser annealing was regarded as a tool for crystallization. High light absorption induced fast heating process. A 405 nm violet laser located near the absorption peak of typical perovskite films was employed as the annealing laser. In an in situ experimental design, the annealing laser beam was combined into the micro Raman measurement system. Real-time information of the annealing and crystallization was provided. Many excellent works were done, and typically needed offline optoelectronic measurements. An mW-level continuous-wave laser beam can provide enough kinetic energy for crystalline in perovskite microwires. The thermal distribution of the perovskite microwire under the annealing laser beams was considered here. Polarized Raman signals can provide evidence of the perovskite microwires crystallization. This work offered the novel approach of an on-site, real-time laser-induced thermal annealing design for perovskite microwires. This approach can be used in other material procedures. Intensity-dependent conditions were crucial for the annealing processes and analyzed in detail. The substrate effect was found. This proposed scheme provided integrated novel, scalable, and highly effective designs of perovskite-based devices. Full article
(This article belongs to the Special Issue Optoelectronic Materials and Their Applications)
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