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Advanced Optical Materials for Photodetector and Energy Conversion

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A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 3938

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Special Issue Editors

Dr. Jianping Meng

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Guest Editor

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, China
Interests: heterojunction sensor; neuromorphic engineering; photothermal conversion coatings

Dr. Qilin Hua

E-Mail Website
Guest Editor

Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, China
Interests: flexible/stretchable electronics; nanoelectronics; neuromorphic computing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, the field of optics is expanding at an explosive rate. The optical properties of materials arise from the characteristics of their interactions with electromagnetic waves. Optical materials are the footstone of optical functional devices for photodetector and energy conversion, which include photodetectors, lasers, photovoltaic devices, photothermal coatings, and so on. The progress of optical materials still needs more efforts to promote the development of optical functional devices.

For this reason, the Special Issue welcomes original research, review, and perspective articles, including, but not limited to, the following aspects: (1) the novel optical materials; (2) the new designs of optical function devices; (3) self-powered photodetector based the third-generation semiconductors; (4) the novel materials and design for photovoltaic devices and photothermal conversion; (5) high-performance photodetector enhanced by piezo-phototronic effect or pyro-phototronic effect.

Dr. Jianping Meng
Dr. Qilin Hua
Guest Editors

Manuscript Submission Information

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Keywords

photodetector
localized surface plasmon resonance (LSPR)
photothermal conversion coatings
photovoltaic devices
laser diodes
piezo-phototronic effect
pyro-phototronic effect

Published Papers (3 papers)

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Research

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15 pages, 4344 KiB

Open AccessArticle

First Principles Study of the Photoelectric Properties of Alkaline Earth Metal (Be/Mg/Ca/Sr/Ba)-Doped Monolayers of MoS₂

by Li-Zhi Liu, Xian-Sheng Yu, Shao-Xia Wang, Li-Li Zhang, Xu-Cai Zhao, Bo-Cheng Lei, Hong-Mei Yin and Yi-Neng Huang

Molecules 2023, 28(16), 6122; https://doi.org/10.3390/molecules28166122 - 18 Aug 2023

Cited by 3 | Viewed by 997

Abstract

The energy band structure, density of states, and optical properties of monolayers of MoS₂ doped with alkaline earth metals (Be/Mg/Ca/Sr/Ba) are systematically studied based on first principles. The results indicate that all the doped systems have a great potential to be formed and structurally stable. In comparison to monolayer MoS₂, doping alkaline earth metals results in lattice distortions in the doped system. Therefore, the recombination of photogenerated hole–electron pairs is suppressed effectively. Simultaneously, the introduction of dopants reduces the band gap of the systems while creating impurity levels. Hence, the likelihood of electron transfer from the valence to the conduction band is enhanced, which means a reduction in the energy required for such a transfer. Moreover, doping monolayer MoS₂ with alkaline earth metals increases the static dielectric constant and enhances its polarizability. Notably, the Sr–MoS₂ system exhibits the highest value of static permittivity, demonstrating the strongest polarization capability. The doped systems exhibit a red-shifted absorption spectrum in the low-energy region. Consequently, the Be/Mg/Ca–MoS₂ systems demonstrate superior visible absorption properties and a favorable band gap, indicating their potential as photo-catalysts for water splitting. Full article

(This article belongs to the Special Issue Advanced Optical Materials for Photodetector and Energy Conversion)

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13 pages, 4099 KiB

Open AccessArticle

Enhancing Methane Removal Efficiency of ZrMnFe Alloy by Partial Replacement of Fe with Co

by Shumei Chen, Miao Du, Shuai Li, Zhinian Li and Lei Hao

Molecules 2023, 28(11), 4373; https://doi.org/10.3390/molecules28114373 - 26 May 2023

Viewed by 791

Abstract

High-purity hydrogen is extensively employed in chemical vapor deposition, and the existence of methane impurity significantly impacts the device performance. Therefore, it is necessary to purify hydrogen to remove methane. The ZrMnFe getter commonly used in the industry reacts with methane at a [...] Read more.

^{\circ}

C, and the removal depth is not sufficient. To overcome these limitations, Co partially substitutes Fe in the ZrMnFe alloy. The alloy was prepared by suspension induction melting method, and was characterized by means of XRD, ICP, SEM and XPS. The concentration of methane at the outlet was detected by gas chromatography to characterize the hydrogen purification performance of the alloy. The removal effect of the alloy on methane in hydrogen increases first and then decreases with the increase in substitution amount, and increases with the increase in temperature. Specifically, the ZrMnFe_0.7Co_0.3 alloy reduces methane levels in hydrogen from 10 ppm to 0.215 ppm at 500

^{\circ}

C. ZrMnFe_0.7Co_0.3 alloy can remove 50 ppm of methane in helium to less than 0.01 ppm at 450

^{\circ}

C, demonstrating its excellent methane reactivity. Moreover, Co substitution reduces the formation energy barrier of ZrC, and Co in the electron-rich state demonstrates superior catalytic activity for methane decomposition. Full article

(This article belongs to the Special Issue Advanced Optical Materials for Photodetector and Energy Conversion)

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Review

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20 pages, 4980 KiB

Open AccessReview

Niobium Nitride Preparation for Superconducting Single-Photon Detectors

by Peng Luo and Yihui Zhao

Molecules 2023, 28(17), 6200; https://doi.org/10.3390/molecules28176200 - 23 Aug 2023

Viewed by 1863

Abstract

Niobium nitride (NbN) is widely used in the production of superconducting nanowire single-photon detectors (SNSPDs) due to its high superconducting transition temperature and suitable energy gap. The processing parameters used for the preparation of NbN films and the subsequent processing of nanowires have a significant effect on the performance of the SNSPD. In this review, we will present various thin film growth methods, including magnetron sputtering, atomic layer deposition (ALD), and chemical vapor deposition (CVD). The relationships between the superconducting performance of each thin film and the corresponding deposition process will be discussed. Subsequently, NbN nanowire fabrication methods and microstructures based on thin film etching will be summarized, and their impact on the qualities of the finished SNSPDs will be systematically analyzed. Finally, we will provide an outlook for the future development of preparation for SNSPD. Full article

(This article belongs to the Special Issue Advanced Optical Materials for Photodetector and Energy Conversion)

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