Compensating the Degradation of Near-Infrared Absorption of Black Silicon Caused by Thermal Annealing

Wang, Yanchao; Gao, Jinsong; Yang, Haijian; Wang, Xiaoyi; Shen, Zhen

doi:10.1186/s11671-016-1281-4

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…The second candidate, black silicon, is a type of unique material with needle-shaped surface structures and high aspect ratio, as shown in Figure d. It can be fabricated by femtosecond laser irradiation − or physical/chemical etching. − After appropriate surface modification, the needle-shaped morphology results in the “truly superhydrophobic” surfaces, − which allows not only a large contact angle (>150°) but also a small contact angle hysteresis (the difference between advancing and receding contact angles). The condensed droplets can easily detach from such a surface through sweeping or jumping .…”

Section: Improving Atmospheric Water Harvesting Capability By Substra...mentioning

confidence: 99%

Water Harvesting from Air: Current Passive Approaches and Outlook

Liu

Beysens

Bourouina

2022

ACS Materials Lett.

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In the context of global water scarcity, water vapor available in air is a non-negligible supplementary fresh water resource. Current and potential energetically passive procedures for improving atmospheric water harvesting (AWH) capabilities involve different strategies and dedicated materials, which are reviewed in this paper, from the perspective of morphology and wettability optimization, substrate cooling, and sorbent assistance. The advantages and limitations of different AWH strategies are respectively discussed, as well as their water harvesting performance. The various applications based on advanced AWH technologies are also demonstrated. A prospective concept of multifunctional water vapor harvesting panel based on promising cooling material, inspired by silicon-based solar energy panels, is finally proposed with a brief outlook of its advantages and challenges.

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Section: Improving Atmospheric Water Harvesting Capability By Substra...mentioning

confidence: 99%

Water Harvesting from Air: Current Passive Approaches and Outlook

Liu

Beysens

Bourouina

2022

ACS Materials Lett.

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“…[ 20,48,49 ] However, it was difficult to control the distribution of each level and the number of impurities. This doping process is susceptible to thermal annealing and intensity of laser impulses, [ 50 ] and it incurs high cost and requires significantly high fabrication time. [ 9,48 ] Another approach involves collective oscillations of free electrons in metallic nanoparticles (NPs) to excite a localized surface plasmon resonance (LSPR), forcing optical extinction.…”

Section: Introductionmentioning

confidence: 99%

Ultralow Broadband Reflectivity in Black Silicon via Synergy between Hierarchical Texture and Specific‐Size Au Nanoparticles

Zhang

Martinsen

et al. 2020

Advanced Optical Materials

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in size and geometry, and they are categorized as micro/nanoscale [10-14] and order/ disordered forms. [15,16] Noteworthy, the structures with high aspect ratio [7,17-19] and with size matching the wavelength of incident light [6,9,20] exhibit low reflectivity. [9,21] The former parameter extends the optical path of incident light, [10,22] while the latter dimension facilitates coupling between light and materials. [5,23] These effects allow the incident light to get trapped and decayed in the surface structures, giving rise to ultralow reflection at near-ultraviolet (UV) to visible (vis) wavelengths. [24-26] A series of fabrication approaches, including metal-assisted chemical etching, [27,28] electrochemical etching, [29,30] and reactive ion etching (RIE) [9] has been developed to create such surface textures. In particular, RIE enables highly selective etching and produces smooth, vertical profiles, as well as higher structural resolution and density. [31,32] Research into such processes has focused on mask-assisted [33-37] and maskless etching, [38-41] both of which can be effectively used to produce black silicon with micro/nanoscale features. Although a few studies have proposed the combination of micro-and nanostructures, they mainly focused on the suppression of light reflection at the wavelengths below 1100 nm. The antireflectance of black silicon in the near-infrared (NIR) range (over 1100 nm) is still weak due to silicon's intrinsic bandgap of 1.12 eV. [5] Antireflectivity is one of the critical factors defining the performance of black silicon in optical, photothermal, photochemical, and optoelectronic applications. The photonic applications under visible light illumination are commonly tuned through surface texturing; however, their promising performance under longer wavelength (>1100 nm) requires either intrinsic lattice modifications or additional substance enhancement. Recent advances in microfabrication and material engineering have enabled in-depth exploration into the synergy between surface texturing and material reinforcement. In this study, black silicon with novel chimney-like hierarchical micro/nanostructures is fabricated via two-step reactive ion etching, and subsequently gold nanoparticles (Au NPs) are loaded on the black silicon by magnetron sputtering deposition. The micro/nanostructures result in synergy effect with the Au NPs on suppression of light reflection. An ultralow broadband reflection (<1%, wavelength 220-2600 nm) is achieved from the Au-loaded black silicon substrates. The impact of Au NPs and structural design such as size, spacing, shape, and etching duration on antireflectivity of black silicon is investigated. This study opens up new avenue for high-efficiency applications of black silicon in the fields of sustainable energy and photonics/microelectronics.

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“…There are two possible reasons for the increase in absorption on the amount of Ag added. Firstly, the improvement in the absorption of the samples with an increase in Ag content is related to the localized surface plasmon resonance (LSPR) caused due to the spatially confined electrons in Ag particles [48,49]. Secondly, the black body absorption caused due to the addition of Ag powder [50,51].…”

Section: Uv-vis Diffuse Reflectance Spectramentioning

confidence: 99%

Template-Free Processing of Ag-Anchored ZnO Polyscale Sheets and Their Application in the Photocatalytic Degradation of Organics Present in Pharmaceutical Waste

Sajan

Naik²,

Girish

et al. 2017

Water Conserv Sci Eng

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Template-free processing of Ag-anchored ZnO polyscale sheets was successfully synthesized using the onepot hydrothermal technique. The characterization of the synthesized samples was done using powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, UV-vis spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic degradation of organics present in pharmaceutical waste on exposure to sunlight and UV light confirms the photocatalytic degradation efficiency of the synthesized samples. The effectiveness of the degradation was measured based on the chemical oxygen demand and percent decomposition of the organics present in the pharmaceutical waste. Our studies revealed that the photodegradation efficiency of the samples varies with added amounts of Ag content. The maximum photocatalytic degradation efficiency was obtained using 2% Ag-deposited ZnO polyscale sheets (2AZ), where the rates of decomposition were 77.8% under sunlight and 76% under UV light.

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Compensating the Degradation of Near-Infrared Absorption of Black Silicon Caused by Thermal Annealing

Cited by 7 publications

References 21 publications

Water Harvesting from Air: Current Passive Approaches and Outlook

Water Harvesting from Air: Current Passive Approaches and Outlook

Ultralow Broadband Reflectivity in Black Silicon via Synergy between Hierarchical Texture and Specific‐Size Au Nanoparticles

Template-Free Processing of Ag-Anchored ZnO Polyscale Sheets and Their Application in the Photocatalytic Degradation of Organics Present in Pharmaceutical Waste

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