Enhanced localized surface plasmon resonance obtained in two step etched silicon nanowires decorated with silver nanoparticles

Mulazimoglu, Emre; Nogay, Gizem; Turan, Raşit; Ünalan, Hüsnü Emrah

doi:10.1063/1.4824646

Cited by 18 publications

(12 citation statements)

References 38 publications

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“…Other reports have highlighted the superior passivation of vertically aligned Si nanorods by a SiO 2 -multiwall carbon nanotube (SiO 2 /MWCNT) multishell [ 17 ]. Different techniques can be employed for the deposition of MNPs, including electroless deposition via a chemical solution [ 9 , 12 , 13 ], pulsed laser ablation [ 11 ], drop-casting [ 16 ], thermal evaporation [ 5 , 18 ], and more. The later technique is recommended and is one of the simplest and economical methods, enabling easy material anchoring with good properties and reduced surface damage [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Several methodologies have been adopted with the primary goal of achieving efficient SERS platforms. Among them, it is worth mentioning the realization of SERS substrates that operate in three dimensions (3D), as obtained by decorating high density arrays of silicon nanowires with metal nanoparticles [24,25,26], which allow for the achievement a huge density of hot spots under the laser beam. The major advantage of 3D SERS platforms is related to a significant increment of their surface-to-volume ratio, leading, in the end, to an increased enhancement of factors of at least one order of magnitude compared to lower dimensional SERS substrates [24,27,28].…”

Section: Introductionmentioning

confidence: 99%

Fractal Silver Dendrites as 3D SERS Platform for Highly Sensitive Detection of Biomolecules in Hydration Conditions

et al. 2019

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In this paper, we report on the realization of a highly sensitive and low cost 3D surface-enhanced Raman scattering (SERS) platform. The structural features of the Ag dendrite network that characterize the SERS material were exploited, attesting a remarked self-similarity and scale invariance over a broad range of length scales that are typical of fractal systems. Additional structural and optical investigations confirmed the purity of the metal network, which was characterized by low oxygen contamination and by broad optical resonances introduced by the fractal behavior. The SERS performances of the 3D fractal Ag dendrites were tested for the detection of lysozyme as probe molecule, attesting an enhancement factor of ~2.4 × 106. Experimental results assessed the dendrite material as a suitable SERS detection platform for biomolecules investigations in hydration conditions.

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“…Despite the optical losses by the Ag BR, the enhanced near-field caused by the LSPs at the bottom of the SiNW compensates the loss and thus boosts the ultimate efficiencies of the SiNW solar cells after integrating them with a NCG Ag BR, where the optimal embedded wire depth was ~20 nm. Emre Mulazimoglu et al deposit silver nanoparticles on vertical-arrayed SiNWs to obtain optical absorption enhancement [278]. Almost 50-fold enhanced LSPs was obtained for 24 nm thick silver deposited on 5 μm long silicon nanowires and this can be ascribed to the modification in the dielectric constant of effective medium created by defect states, demonstrated in Fig.…”

Section: Plamonic Sinw Solar Cellsmentioning

confidence: 99%

Design and fabrication of silicon nanowires towards efficient solar cells

et al. 2016

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The recent rise of semiconductor nanowires opens new opportunities for realizing high efficiency photovoltaic devices at low cost due to the unique one-dimensional structure with remarkable electrical and optical properties. Particularly, silicon nanowires (SiNWs), as one of the most earthabundant materials, have been investigated worldwide to develop cost-effective solar cells. Great efforts have been devoted to fabricating ordered/disordered SiNWs using cost-effective approaches and achieving optimized structural parameters, such as array periodicity, nanowire morphology, length and diameter. Systematic theoretical investigations along with experimental studies on optical and electrical properties of SiNWs have been carried out. These efforts have led to obtaining remarkable improvement of the power conversion efficiency of SiNW solar cells from <1% to >10% in the last few years. However, till now, the power conversion efficiency of these SiNW solar cells is far from satisfactory for any commercial applications compared with the traditional bulk silicon solar cells. Further development of SiNW solar cells requires better understanding of the optical and electrical properties of the nanowire solar cells. Improvement in fabrication of high quality nanowires in a controlled fashion also plays a significant role in nanowire solar cell design and fabrication. To guide future development of SiNW solar cells, the recent work on SiNWs is reviewed. Following that, various techniques aiming to achieve high quality nanowires at low cost are introduced. Both bottom-up and top-down techniques are discussed. Then, electrical properties and various types of solar cells based on SiNWs are discussed. Finally challenges and prospects of SiNW solar cells are presented.

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Enhanced localized surface plasmon resonance obtained in two step etched silicon nanowires decorated with silver nanoparticles

Cited by 18 publications

References 38 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

Fractal Silver Dendrites as 3D SERS Platform for Highly Sensitive Detection of Biomolecules in Hydration Conditions

Design and fabrication of silicon nanowires towards efficient solar cells

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