Light harvesting hexamolybdenum cluster integrated with the 3D ordered semiconductor inverse opals for optoelectronic property

Nguyen, Tri Khoa; Grasset, Fabien; Cordier, Stéphane; Dumait, Noée; Ishii, Satoshi; Fudouzi, H.; Uchikoshi, Tetsuo

doi:10.1016/j.mtchem.2022.101351

Cited by 7 publications

(5 citation statements)

References 61 publications

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“…The fitted data of MI deposited on quartz show an average emission lifetime (τ e ) of 1.172 μs that includes a high real percentage of about 98.1% (τ 1 = 58 ns) and the other is 1.9% (τ 2 = 58.7 μs). This is in agreement with the emission lifetime of the Mo 6 -based clusters reported in the μs range. , The shorter lifetime is caused by the aggregated clusters while another comes from the monodispersed clusters. The emission lifetimes of the isolated MINS x ( x = 16, 24, 35) deposited on quartz were fitted by a three-exponential decay calculation.…”

Section: Resultssupporting

confidence: 91%

“…For this reason, the incorporation of the Mo 6 cluster with a semiconductor has essentially been studied to enhance the charge transfer via covalent bonds or ionic interactions. Several designs have been studied using TiO 2 for solar cells, double layer hydroxides or tin pyrophosphate semiconductors for photoconductivity sensors, and graphene oxide for enhanced photoinactivation. ,− …”

Section: Introductionmentioning

confidence: 99%

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Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Nguyen,

Ishii,

Renaud

et al. 2023

ACS Appl. Energy Mater.

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The photovoltaic performance of molybdenum cluster-sensitized solar cells has been explored with the challenge of enhancing their efficiency due to the low charge transfer efficiency. Aromatic sulfonate ligands (NS = naphthalene 2,6disulfonate = −OSO 2 −C 10 H 6 −SO 3 − ) were now used for the functionalization of the {Mo 6 I i 8 } cluster cores. The new functional [Mo 6 I 8 i I 3a (H 2 O) 2 a (NS) a ] cluster unit exhibits enhanced photophysical and photoelectrochemical properties compared to other homologues based on the {Mo 6 I 8 i } cluster cores. In greater detail, the role of the NS functional groups was beneficially emphasized for the improved oxidation stability of the cluster in a redox mediator, adjusting the emission lifetime to a suitable range for fast electron injection, and accelerating the charge transport process. The best as-synthesized Mo 6 cluster-based solar cell resulted in a stable photocurrent of 2.38 mA cm −2 with a fill factor of 0.63 and the power conversion efficiency of 0.97% under an AM 1.5 illumination, a two times' enhancement in comparison to the reference iodide Mo 6 cluster-based cell (0.52%). Specific attention focused on the increase of the power conversion efficiency up to 1.18% after 330 s and then reached the saturation trend. The enhanced charge transfer of the metal cluster complex was obtained from facile modifications of the functional apical ligands that result in advantageous photophysical and electrochemical characteristics, specializing in optoelectronic devices. This study provides the general methodology and knowledge for the next improvement of the photovoltaic efficiency of the Mo 6 cluster-based sensitized solar cells.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Nguyen,

Ishii,

Renaud

et al. 2023

ACS Appl. Energy Mater.

Self Cite

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“…As shown in Figure 2a, on the higher photon energy edge (blue edge) of the PBG, the light standing wave is primarily localized in the low refractive index dielectric components, while it is localized in the high refractive index dielectric components on the lower photon energy edge (red edge) [56] . Slow photons in PC structures originate from the interaction between the wave packet reflected by the PBG and the non‐reflected (i. e., transmitted) wave packet with wavelengths outside but close to the PBG, which leads to a stationary wave packet with a strongly reduced group velocity [57–59] . The principle for improving the light utilization efficiency relies on the enhanced interaction between light and micro‐nano structures.…”

Section: Theory Of Photon Managementmentioning

confidence: 99%

“…[56] Slow photons in PC structures originate from the interaction between the wave packet reflected by the PBG and the non-reflected (i. e., transmitted) wave packet with wavelengths outside but close to the PBG, which leads to a stationary wave packet with a strongly reduced group velocity. [57][58][59] The principle for improving the light utilization efficiency relies on the enhanced interaction between light and micro-nano structures. If photons could reside in the material longer, the interactions between light and the material would be markedly improved.…”

Section: Slow Photon Effectmentioning

confidence: 99%

Photon Management Enabled by Opal and Inverse Opal Photonic Crystals: from Photocatalysis to Photoluminescence Regulation

Wang,

Cheng,

Zhu

et al. 2024

ChemPlusChem

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Photonic crystals (PCs) can adjust the propagation and distribution of photons because of their unique periodic structures, which offers a compelling platform for photon management. The periodicity of materials with an alternating refractive index can be used to manipulate the dispersion of photons to generate the photonic bandgap (PBG), in which light is reflected. The slow photon effect, i.e., photon propagation at a reduced group velocity near the edges of the PBG, is widely regarded as another valuable optical property for manipulating light. Furthermore, multiple light scattering can increase the optical path, which is a vital optical property for PCs. Recently, the light reflected by PBG, the slow photon effect, and multiple light scattering have been exploited to improve light utilization efficiency in photoelectrochemistry, materials chemistry, and biomedicine to enhance light‐energy conversion efficiency. In this review, the fabrication of opal or inverse opal PCs and the theory for improving the light utilization efficiency of photocatalysis, solar cells, and photoluminescence regulation are discussed. We envision photon management of opal or inverse opal PCs may provide a promising avenue for light‐assisted applications to improve light‐energy‐conversion efficiency.

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“…Meanwhile, Huang et al [ 27 ] suggested that the PL in AAO membrane originates from oxygen ion defect states (F center) within the AAO membrane, with emission peaks located at 413 nm and 430 nm. The PL effect of AAO has been explored in many studies [ 28 , 29 , 30 , 31 ], among which Zheng et al [ 31 ] investigated the variation in PL intensity of AAO under different anodizing voltages. It was found that the PL intensity of AAO significantly decreases at high voltages of 130 V compared with traditional MA at 40 V [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Normal-to-High Anodizing Voltage on AAO Surface Hardness from 1050 Aluminum Alloy in Oxalic Acid

Ku,

Wu,

Hung

et al. 2024

Micromachines

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Anodic aluminum oxide (AAO) has been widely applied for the surface protection of electronic component packaging through a pore-sealing process, with the enhanced hardness value reaching around 400 Vickers hardness (HV). However, the traditional AAO fabrication at 0~10 °C for surface protection takes at least 3–6 h for the reaction or other complicated methods used for the pore-sealing process, including boiling-water sealing, oil sealing, or salt-compound sealing. With the increasing development of nanostructured AAO, there is a growing interest in improving hardness without pore sealing, in order to leverage the characteristics of porous AAO and surface protection properties simultaneously. Here, we investigate the effect of voltage on hardness under the same AAO thickness conditions in oxalic acid at room temperature from a normal level of 40 V to a high level of 100 V and found a positive correlation between surface hardness and voltage. The surface hardness values of AAO formed at 100 V reach about 423 HV without pore sealing in 30 min. By employing a hybrid pulse anodization (HPA) method, we are able to prevent the high-voltage burning effect and complete the anodization process at room temperature. The mechanism behind this can be explained by the porosity and photoluminescence (PL) intensity of AAO. For the same thickness of AAO from 40~100 V, increasing the anodizing voltage decreases both the porosity and PL intensity, indicating a reduction in pores, as well as anion and oxygen vacancy defects, due to rapid AAO growth. This reduction in defects in the AAO film leads to an increase in hardness, allowing us to significantly enhance AAO hardness without a pore-sealing process. This offers an effective hardness enhancement in AAO under economically feasible conditions for the application of hard coatings and protective films.

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Light harvesting hexamolybdenum cluster integrated with the 3D ordered semiconductor inverse opals for optoelectronic property

Cited by 7 publications

References 61 publications

Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Effect of an Aromatic Sulfonate Ligand on the Photovoltaic Performance of Molybdenum Cluster-Sensitized Solar Cells

Photon Management Enabled by Opal and Inverse Opal Photonic Crystals: from Photocatalysis to Photoluminescence Regulation

Influence of Normal-to-High Anodizing Voltage on AAO Surface Hardness from 1050 Aluminum Alloy in Oxalic Acid

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