Effective surface passivation on multi-crystalline silicon using aluminum/porous silicon nanostructures

Achref, M.; Bessadok.J, A.; Khezami, Lotfi; Mokraoui, Salim; Rabha, M. Ben

doi:10.1016/j.surfin.2019.100391

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…The spectra of the nPSi sample displayed bands in the range of 615–666 cm −1 , which corresponds to SiH x deformation modes overlapping the silicon crystal modes [ 27 ]. At 1220 cm −1 , a band associated with amorphous silicon dioxide (a-SiO 2 ) [ 28 ] was observed, and at 1350 cm −1 , a band attributed to the Si-O wiggling mode [ 29 ] was observed. The band at 3240 cm −1 corresponds to the stretching vibration mode of the OH in the silanol (Si-OH) groups [ 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Films of Silver Nanoparticles Embedded into Carboxymethylcellulose/Chitosan Multilayers on Nanoporous Silicon: A Layer-by-Layer Assembly Approach Comparing Dip and Spin Coating

Naveas

Pulido

Torres-Costa

et al. 2023

IJMS

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The design and engineering of antibacterial materials are key for preventing bacterial adherence and proliferation in biomedical and household instruments. Silver nanoparticles (AgNPs) and chitosan (CHI) are broad-spectrum antibacterial materials with different properties whose combined application is currently under optimization. This study proposes the formation of antibacterial films with AgNPs embedded in carboxymethylcellulose/chitosan multilayers by the layer-by-layer (LbL) method. The films were deposited onto nanoporous silicon (nPSi), an ideal platform for bioengineering applications due to its biocompatibility, biodegradability, and bioresorbability. We focused on two alternative multilayer deposition processes: cyclic dip coating (CDC) and cyclic spin coating (CSC). The physicochemical properties of the films were the subject of microscopic, microstructural, and surface–interface analyses. The antibacterial activity of each film was investigated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria strains as model microorganisms. According to the findings, the CDC technique produced multilayer films with higher antibacterial activity for both bacteria compared to the CSC method. Bacteria adhesion inhibition was observed from only three cycles. The developed AgNPs–multilayer composite film offers advantageous antibacterial properties for biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Antibacterial Films of Silver Nanoparticles Embedded into Carboxymethylcellulose/Chitosan Multilayers on Nanoporous Silicon: A Layer-by-Layer Assembly Approach Comparing Dip and Spin Coating

Naveas

Pulido

Torres-Costa

et al. 2023

IJMS

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“…The results of the infrared spectra show that Si-O x , Al-O-Si, and Si-H x lead to surface defects and the passivation of dangling bonds. Finally, the effective carrier lifetime increased by 98%, and the internal quantum efficiency increased from 20% to 60% [258]. In general, the passivation of silicon solar cells with nanostructures is essential to improve the conversion efficiency.…”

Section: Surface Passivation Of Nanostructuresmentioning

confidence: 99%

Micro/Nanostructures for Light Trapping in Monocrystalline Silicon Solar Cells

Liu

Yin

et al. 2022

Journal of Nanomaterials

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Due to the ongoing depletion of fossil energy, alternative energy-sources and their respective conversion technologies have become very essential. An inexhaustible and clean energy form, which is already widely used, is solar energy. However, despite much progress in recent decades, due to the limitations of materials and manufacturing technology, the ability of solar cells to convert light into electrical energy is still not very high. Enhancing light absorption and reducing electric loss are the keys to improving the overall conversion efficiency of solar cells and reducing raw material costs. The former can be achieved by using micro/nanostructures and other surface features, while the latter can be realized by surface passivation. Researchers have developed different silicon-surface texturing methods to fabricate random or periodic micro/nanostructures on the surface of silicon wafers. Thanks to the special and efficient light-trapping effects of silicon micro/nanostructures, both full angle and wideband light absorption can be achieved. Different passivation methods and materials have also been widely studied, which helps to improve the surface recombination of photogenerated carriers caused by light trapping structure and significantly enhance the power conversion efficiency of Si solar cells. In this work, theoretical studies of enhanced light-trapping in micro/nanostructures are introduced. In addition, several advanced methods for preparing micro/nanostructures on the surface of monocrystalline silicon are discussed. These can be classified as top-down and bottom-up approaches. Furthermore, passivation methods for micro/nanostructures on the surface of monocrystalline silicon solar cells are reviewed, including chemical passivation and field-effect passivation. Finally, advantages and disadvantages of the micro/nanostructure preparation technologies, and light-trapping effects of the micro/nanostructures, which were fabricated using these manufacturing technologies were summarized. Moreover, the effects of different passivation technologies on the optical properties and electrical properties of these micro/nanostructures are studied. An outlook of expected and emerging research directions for monocrystalline silicon solar cells concludes this study.

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“…It is known from the literature that the integration of nanomaterials and metallic nanoparticles such as gold (Au) [16], silver (Ag) [17], copper (Cu) [18], aluminum (Al) [19], and nickel (Ni) [20] into the PS matrix change its optical properties, in particular, the intensity of photoluminescence (PL) increases. In practice, there are various methods for integrating a metal or metal oxide onto the PS surface, such as electroplating [21], sputtering [22], electrochemical or electrodeless chemical deposition [23], and electron beam evaporation [24].…”

Section: Introductionmentioning

confidence: 99%

Change of Optical Properties of Carbon-Doped Silicon Nanostructures under the Influence of a Pulsed Electron Beam

Darmenkulova

Aitzhanov

Zhumatova

et al. 2022

Journal of Nanotechnology

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In the work, porous silicon with observed photoluminescence was made from a p-type silicon substrate doped with boron and crystallographic orientation (100) using the method of electrochemical etching in a solution containing H2(SiF6) (silicon hydrofluoric acid) and ethyl alcohol. Thin carbon films were sprayed by high-frequency magnetron sputtering at room temperature onto the surface of porous silicon. The resulting carbon-doped thin films of porous silicon were irradiated on a pulsed electron booster and comparisons were made with nonirradiated films of porous silicon. To understand the effect of carbon on the properties of porous silicon films samples were analyzed by Raman spectroscopy, spectrophotometry, and scanning probe microscopy (SPM). The results of the SPM showed that the roughness of the samples increases after carbon doping on the surface of porous silicon. Thus, for the first time, experimental results were obtained on the effect of irradiation on carbon-doped porous silicon obtained in a solution containing hydrogen hexafluorosilicate H2(SiF6) and a significant change in its optical properties was shown. The results of the study showed that irradiated samples of carbon-doped porous silicon have better photoluminescence compared to nonirradiated samples.

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Effective surface passivation on multi-crystalline silicon using aluminum/porous silicon nanostructures

Cited by 12 publications

References 34 publications

Antibacterial Films of Silver Nanoparticles Embedded into Carboxymethylcellulose/Chitosan Multilayers on Nanoporous Silicon: A Layer-by-Layer Assembly Approach Comparing Dip and Spin Coating

Antibacterial Films of Silver Nanoparticles Embedded into Carboxymethylcellulose/Chitosan Multilayers on Nanoporous Silicon: A Layer-by-Layer Assembly Approach Comparing Dip and Spin Coating

Micro/Nanostructures for Light Trapping in Monocrystalline Silicon Solar Cells

Change of Optical Properties of Carbon-Doped Silicon Nanostructures under the Influence of a Pulsed Electron Beam

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