Enhancement of porous silicon photoluminescence property by lithium chloride treatment

Azaiez, Khawla; Zaghouani, R. Benabderrahmane; Khamlich, S.; Meddeb, Hosni; Dimassi, Wissem

doi:10.1016/j.apsusc.2018.02.006

Cited by 18 publications

(6 citation statements)

References 16 publications

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“…On the other hand, it is easy to notice the appearance of new vibration peaks after the Bi deposition. In the literature, many authors have reported that metal-oxygen vibrations modes occur in the range of the spectrum from 400 to 700 cm −1 [ 28 , 29 , 30 ], while other works have reported that these latter vibrations appear below 1000 cm −1 [ 31 , 32 ]. Hence, the new peaks situated at 614, 733, and 940 cm −1 can be attributed to the formation of new bismuth–oxygen bands.…”

Section: Resultsmentioning

confidence: 99%

“…Interestingly, all the Bi-treated samples present an enormous enhancement in the PL intensity with respect to that of bare SiNWs. Furthermore, all the observed Gaussian PL bands are centered at 695 nm (1.78 eV), without record of any considerable shift, though the surfaces are modified by BiNC, suggesting the successful passivation of the samples [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

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Highly Efficient Silicon Nanowire Surface Passivation by Bismuth Nano-Coating for Multifunctional Bi@SiNWs Heterostructures

et al. 2020

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A key requirement for the development of highly efficient silicon nanowires (SiNWs) for use in various kinds of cutting-edge applications is the outstanding passivation of their surfaces. In this vein, we report on a superior passivation of a SiNWs surface by bismuth nano-coating (BiNC) for the first time. A metal-assisted chemical etching technique was used to produce the SiNW arrays, while the BiNCs were anchored on the NWs through thermal evaporation. The systematic studies by Scanning Electron Microscopy (SEM), energy dispersive X-ray spectra (EDX), and Fourier Transform Infra-Red (FTIR) spectroscopies highlight the successful decoration of SiNWs by BiNC. The photoluminescence (PL) emission properties of the samples were studied in the visible and near-infrared (NIR) spectral range. Interestingly, nine-fold visible PL enhancement and NIR broadband emission were recorded for the Bi-modified SiNWs. To our best knowledge, this is the first observation of NIR luminescence from Bi-coated SiNWs (Bi@SiNWs), and thus sheds light on a new family of Bi-doped materials operating in the NIR and covering the important telecommunication wavelengths. Excellent anti-reflectance abilities of ~10% and 8% are observed for pure SiNWs and Bi@SiNWs, respectively, as compared to the Si wafer (50–90%). A large decrease in the recombination activities is also obtained from Bi@SiNWs heterostructures. The reasons behind the superior improvement of the Bi@SiNWs performance are discussed in detail. The findings demonstrate the effectiveness of Bi as a novel surface passivation coating, where Bi@SiNWs heterostructures are very promising and multifunctional for photovoltaics, optoelectronics, and telecommunications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Highly Efficient Silicon Nanowire Surface Passivation by Bismuth Nano-Coating for Multifunctional Bi@SiNWs Heterostructures

et al. 2020

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“…An increase of the photoluminescence intensity could also be observed by electrodepositing Ag particles from an AgNO 3 solution by varying the deposition time and the concentration of the electrolyte [59]. This behavior of the luminescence is furthermore shown after LiCl treatment of porous silicon as well as an enhancement of the minority carrier lifetime due to the passivation of the dangling bonds at the silicon surface [60].…”

Section: Optical Properties Of Microporous Siliconmentioning

confidence: 75%

Metal Filled Nanostructured Silicon With Respect to Magnetic and Optical Properties

Granitzer

Rumpf

2020

Front. Phys.

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Within this work the utilization of nanostructured silicon as host material for filling with various magnetic nanostructures is reviewed whereas the magnetic and optical properties of the gained composite systems are elucidated. The metal filling of the pores is mainly performed by electroless deposition or by electrodeposition which is discussed by means of some examples. Furthermore, two different types of porous silicon (PSi) morphology are used for the deposition procedure. On the one hand microporous silicon offering luminescence in the visible range is utilized as template material. It offers a branched morphology with a structure size between 2 and 5 nm. In this case not only the magnetic response is investigated but also the influence of the metal filling on the optical properties. On the other hand mesoporous and macroporous silicon in it's low pore regime is employed which offers straight pores with diameters up to 90 nm. In this case the magnetic response strongly depends on the size, the geometry and the spatial distribution of the metal deposits within the pores. A crucial role plays also the morphology of the porous silicon, especially the distance between adjacent pores which is an important parameter regarding magnetic interactions.

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“…A great deal of silicon-bonded hydrogen was formed during the formation of holes when silicon was etched in the HF-containing electrolytic solution. 20,21 The synergistic effect of multihole surface and chemical composition imparted hydrophobic properties. However, after electrochemical etching, the longer silicon stored in air, the more hydroxyl groups formed on the surface.…”

Section: Chemical Compositionmentioning

confidence: 99%

Superhydrophobic Silicon Fabricated by Phosphomolybdic Acid-Assisted Electrochemical Etching

Zhou¹,

Qu²,

Zhang³

et al. 2019

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Controllable geometry silicon surfaces with superhydrophobicity are difficult to be fabricated without photolithography techniques. Superhydrophobic silicon surfaces with water contact angle larger than 150° and sliding angle less than 10° have been successfully fabricated by electrochemical etching strategy. Squarelike hole arrays with controllable geometries, especially ole width and depth were formed on silicon. Compared with the chemical composition, the obvious change of the hole size and surface roughness with etching time was actually the intrinsic factors for wetting regulation. The superhydrophobic silicon exhibited good stability even after storage in air and oil for 2 months. Moreover, the relatively stable superhydrophobic silicon exhibited good self-cleaning and water-proofing properties in air and oil.

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Enhancement of porous silicon photoluminescence property by lithium chloride treatment

Cited by 18 publications

References 16 publications

Highly Efficient Silicon Nanowire Surface Passivation by Bismuth Nano-Coating for Multifunctional Bi@SiNWs Heterostructures

Highly Efficient Silicon Nanowire Surface Passivation by Bismuth Nano-Coating for Multifunctional Bi@SiNWs Heterostructures

Metal Filled Nanostructured Silicon With Respect to Magnetic and Optical Properties

Superhydrophobic Silicon Fabricated by Phosphomolybdic Acid-Assisted Electrochemical Etching

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