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Molecules
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Nanomaterials for Photonic Device and Light–Energy Conversion
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Nanomaterials for Photonic Device and Light–Energy Conversion

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

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 12037

Special Issue Editors

Prof. Dr. Zaizhu Lou

E-Mail Website
Guest Editor
Institute of Nanophotonics, Jinan University, Guangzhou, China
Interests: noble metal nanoparticles; plasmonic semiconductors; nanophotonics; single-particle PL study; photocatalysis; hot electron catalysis; solar energy conversion
Prof. Dr. Wenzhe Li

E-Mail Website
Guest Editor
Institute of New Energy Technology, Jinan University, Guangzhou, China
Interests: perovskite material design; PV devices; light emitting devices; photo detectors semiconductor nanocrystals; thin films; crystallography
Prof. Dr. Long Wen

E-Mail Website
Guest Editor
Institute of Nanophotonics, Jinan University, Guangzhou, China
Interests: plasmonics; photodetectors; biosensors; on-chip spectrometers; electro-optic modulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanomaterials of semiconductors and metals have important applications in a wide range of fields, including optical information, displaying, biosensors, photocatalysis, and solar energy conversion, thanks to their excellent charge transport, tunable light absorption, and highly efficient photon–electron conversion.

 The aim of this Special Issue is to collect original research papers and review articles focused on the following issues: (i) the preparation and application of novel perovskite nanocrystals and thin films in solar cells in photodetectors; (ii) the synthesis and application of plasmonic nanometals in photonic devices and spectrography; the synthesis and application of nanosemiconductors with efficient photocharge separation for photocatalysis. 

Prof. Dr. Zaizhu Lou
Prof. Dr. Wenzhe Li
Prof. Dr. Long Wen
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. Molecules is an international peer-reviewed open access semimonthly 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 2700 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

  • nanocrystals
  • plasmonic nanometals
  • photonics
  • photocatalysis
  • solar cell
  • light–energy conversion

Published Papers (5 papers)

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Research

9 pages, 2258 KiB  
Article
Plasmonic Near-Infrared Photoconductor Based on Hot Hole Collection in the Metal-Semiconductor-Metal Junction
by Zhiwei Sun, Yongsheng Zhong, Yajin Dong, Qilin Zheng, Xianghong Nan, Zhong Liu, Long Wen and Qin Chen
Molecules 2022, 27(20), 6922; https://doi.org/10.3390/molecules27206922 - 15 Oct 2022
Cited by 4 | Viewed by 2167
Abstract
Harvesting energetic carriers from plasmonic resonance has been a hot topic in the field of photodetection in the last decade. By interfacing a plasmonic metal with a semiconductor, the photoelectric conversion mechanism, based on hot carrier emission, is capable of overcoming the band [...] Read more.
Harvesting energetic carriers from plasmonic resonance has been a hot topic in the field of photodetection in the last decade. By interfacing a plasmonic metal with a semiconductor, the photoelectric conversion mechanism, based on hot carrier emission, is capable of overcoming the band gap limitation imposed by the band-to-band transition of the semiconductor. To date, most of the existing studies focus on plasmonic structural engineering in a single metal-semiconductor (MS) junction system and their responsivities are still quite low in comparison to conventional semiconductor, material-based photodetection platforms. Herein, we propose a new architecture of metal-semiconductor-metal (MSM) junctions on a silicon platform to achieve efficient hot hole collection at infrared wavelengths with a photoconductance gain mechanism. The coplanar interdigitated MSM electrode’s configuration forms a back-to-back Schottky diode and acts simultaneously as the plasmonic absorber/emitter, relying on the hot-spots enriched on the random Au/Si nanoholes structure. The hot hole-mediated photoelectric response was extended far beyond the cut-off wavelength of the silicon. The proposed MSM device with an interdigitated electrode design yields a very high photoconductive gain, leading to a photocurrent responsivity up to several A/W, which is found to be at least 1000 times higher than that of the existing hot carrier based photodetection strategies. Full article
(This article belongs to the Special Issue Nanomaterials for Photonic Device and Light–Energy Conversion)
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10 pages, 1891 KiB  
Communication
Accumulation, Directional Delivery and Release of Nanoparticles along a Nanofiber
by Mingcong Wen, Benjun Yao, Shun Yuan and Hongxiang Lei
Molecules 2022, 27(10), 3312; https://doi.org/10.3390/molecules27103312 - 21 May 2022
Viewed by 1098
Abstract
Controllably accumulating and delivering nanoparticles (NPs) into specific locations are a central theme of nano-engineering and important for targeted therapy or bacteria removal. Here we present a technique allowing bidirectional accumulation, directional delivery and release of nanoparticles through two 980-nm-wavelength counter-propagating evanescent waves [...] Read more.
Controllably accumulating and delivering nanoparticles (NPs) into specific locations are a central theme of nano-engineering and important for targeted therapy or bacteria removal. Here we present a technique allowing bidirectional accumulation, directional delivery and release of nanoparticles through two 980-nm-wavelength counter-propagating evanescent waves in an optical nanofiber (NF). Using 713-nm-diameter polystyrene NPs suspension and an 890-nm-diameter NF as an example, we experimentally and theoretically demonstrate that the NPs delivered along the NF surface in opposite directions are accumulated into the region where the scattering loss of the NPs is maximum, and about 90% of the incident optical field from both ends of the NF can be coupled into the region. Moreover, the accumulation region can be controlled by altering the incident optical power ratio of the two counter-propagating laser beams, while the accumulated NPs can be delivered and then released into the specific locations by turning off the two lasers. Full article
(This article belongs to the Special Issue Nanomaterials for Photonic Device and Light–Energy Conversion)
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11 pages, 4755 KiB  
Article
A Modified Sequential Deposition Route for High-Performance Carbon-Based Perovskite Solar Cells under Atmosphere Condition
by Jinyu Wu, Lei Zhang, Qiao Kang, Hongxi Shi, Long Li, Dan Chi, Shihua Huang and Gang He
Molecules 2022, 27(2), 481; https://doi.org/10.3390/molecules27020481 - 13 Jan 2022
Cited by 4 | Viewed by 2066
Abstract
Carbon-based hole transport material (HTM)-free perovskite solar cells have exhibited a promising commercialization prospect, attributed to their outstanding stability and low manufacturing cost. However, the serious charge recombination at the interface of the carbon counter electrode and titanium dioxide (TiO2) suppresses [...] Read more.
Carbon-based hole transport material (HTM)-free perovskite solar cells have exhibited a promising commercialization prospect, attributed to their outstanding stability and low manufacturing cost. However, the serious charge recombination at the interface of the carbon counter electrode and titanium dioxide (TiO2) suppresses the improvement in the carbon-based perovskite solar cells’ performance. Here, we propose a modified sequential deposition process in air, which introduces a mixed solvent to improve the morphology of lead iodide (PbI2) film. Combined with ethanol treatment, the preferred crystallization orientation of the PbI2 film is generated. This new deposition strategy can prepare a thick and compact methylammonium lead halide (MAPbI3) film under high-humidity conditions, which acts as a natural active layer that separates the carbon counter electrode and TiO2. Meanwhile, the modified sequential deposition method provides a simple way to facilitate the conversion of the ultrathick PbI2 capping layer to MAPbI3, as the light absorption layer. By adjusting the thickness of the MAPbI3 capping layer, we achieved a power conversation efficiency (PCE) of 12.5% for the carbon-based perovskite solar cells. Full article
(This article belongs to the Special Issue Nanomaterials for Photonic Device and Light–Energy Conversion)
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15 pages, 5511 KiB  
Article
Photocatalytic Degradation of Palm Oil Mill Effluent (POME) Waste Using BiVO4 Based Catalysts
by Wibawa Hendra Saputera, Aryan Fathoni Amri, Rino R. Mukti, Veinardi Suendo, Hary Devianto and Dwiwahju Sasongko
Molecules 2021, 26(20), 6225; https://doi.org/10.3390/molecules26206225 - 15 Oct 2021
Cited by 10 | Viewed by 2829
Abstract
Disposal of palm oil mill effluent (POME), which is highly polluting from the palm oil industry, needs to be handled properly to minimize the harmful impact on the surrounding environment. Photocatalytic technology is one of the advanced technologies that can be developed due [...] Read more.
Disposal of palm oil mill effluent (POME), which is highly polluting from the palm oil industry, needs to be handled properly to minimize the harmful impact on the surrounding environment. Photocatalytic technology is one of the advanced technologies that can be developed due to its low operating costs, as well as being sustainable, renewable, and environmentally friendly. This paper reports on the photocatalytic degradation of palm oil mill effluent (POME) using a BiVO4 photocatalyst under UV-visible light irradiation. BiVO4 photocatalysts were synthesized via sol-gel method and their physical and chemical properties were characterized using several characterization tools including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), surface area analysis using the BET method, Raman spectroscopy, electron paramagnetic resonance (EPR), and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The effect of calcination temperature on the properties and photocatalytic performance for POME degradation using BiVO4 photocatalyst was also studied. XRD characterization data show a phase transformation of BiVO4 from tetragonal to monoclinic phase at a temperature of 450 °C (BV-450). The defect site comprising of vanadium vacancy (Vv) was generated through calcination under air and maxima at the BV-450 sample and proposed as the origin of the highest reaction rate constant (k) of photocatalytic POME removal among various calcination temperature treatments with a k value of 1.04 × 10−3 min−1. These findings provide design guidelines to develop efficient BiVO4-based photocatalyst through defect engineering for potential scalable photocatalytic organic pollutant degradation. Full article
(This article belongs to the Special Issue Nanomaterials for Photonic Device and Light–Energy Conversion)
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10 pages, 2486 KiB  
Article
Effects of Substitution Position of Carbazole-Dibenzofuran Based High Triplet Energy Hosts to Device Stability of Blue Phosphorescent Organic Light-Emitting Diodes
by Kyung Hyun Choi, Jae Min Kim, Won Jae Chung and Jun Yeob Lee
Molecules 2021, 26(9), 2804; https://doi.org/10.3390/molecules26092804 - 10 May 2021
Cited by 6 | Viewed by 3114
Abstract
High triplet energy hosts were developed through the modification of the substitution position of carbazole units. Two carbazole-dibenzofuran-derived compounds, 9,9′-(dibenzo[b,d]furan-2,6-diyl)bis(9H-carbazole) (26CzDBF) and 4,6-di(9H-carbazol-9-yl)dibenzo[b,d]furan (46CzDBF), were synthesized for achieving high triplet energy hosts. In comparison with the reported hole transport [...] Read more.
High triplet energy hosts were developed through the modification of the substitution position of carbazole units. Two carbazole-dibenzofuran-derived compounds, 9,9′-(dibenzo[b,d]furan-2,6-diyl)bis(9H-carbazole) (26CzDBF) and 4,6-di(9H-carbazol-9-yl)dibenzo[b,d]furan (46CzDBF), were synthesized for achieving high triplet energy hosts. In comparison with the reported hole transport type host, 2,8-di(9H-carbazol-9-yl)dibenzo[b,d]furan (28CzDBF), 26CzDBF and 46CzDBF maintained high triplet energy over 2.95 eV. The device performances of the hosts were evaluated with electron transport type host, 2-phenyl-4, 6-bis(3-(triphenylsilyl)phenyl)-1,3,5-triazine (mSiTrz), to comprise a mixed host system. The deep blue phosphorescent device of 26CzDBF:mSiTrz with [[5-(1,1-dimethylethyl)-3-phenyl-1H-imidazo[4,5-b]pyrazin-1-yl-2(3H)-ylidene]-1,2-phenylene]bis[[6-(1,1-dimethylethyl)-3-phenyl-1H-imidazo[4,5-b]pyrazin-1-yl-2(3H)-ylidene]-1,2-phenylene]iridium (Ir(cb)3) dopant exhibited high external quantum efficiency of 22.9% with a color coordinate of (0.14, 0.16) and device lifetime of 1400 h at 100 cd m−2. The device lifetime was extended by 75% compared to the device lifetime of 28CzDBF:mSiTrz (800 h). These results demonstrated that the asymmetric and symmetric substitution of carbazole can make differences in the device performance of the carbazole- and dibenzofuran- derived hosts. Full article
(This article belongs to the Special Issue Nanomaterials for Photonic Device and Light–Energy Conversion)
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