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Molecules
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Advanced Optical Materials for Photodetector and Energy Conversion
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Advanced Optical Materials for Photodetector and Energy Conversion

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 5783

Special Issue Editors

Dr. Jianping Meng

E-Mail Website
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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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. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

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

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Published Papers (3 papers)

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Research

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15 pages, 4344 KiB  
Article
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 4 | Viewed by 1425
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 [...] Read more.
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  
Article
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 1097
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.
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 temperature as high as 700 ∘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 ZrMnFe0.7Co0.3 alloy reduces methane levels in hydrogen from 10 ppm to 0.215 ppm at 500 ∘C. ZrMnFe0.7Co0.3 alloy can remove 50 ppm of methane in helium to less than 0.01 ppm at 450 ∘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  
Review
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
Cited by 4 | Viewed by 2936
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 [...] Read more.
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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