Enhancing the electronic properties of VLS-grown silicon nanowires by surface charge transfer

Shalabny, Awad; Buonocore, Francesco; Celino, Massimo; Zhang, Lu; Sardashti, Kasra; Härth, Michael; Schubert, Dirk W.; Bashouti, Muhammad Y.

doi:10.1016/j.apsusc.2022.153957

Cited by 6 publications

(3 citation statements)

References 40 publications

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“…APFD, including treatments of the dispersion effects, represented the best trade‐off between accuracy and computational cost for a relatively large system. [ 49 ] After relaxing the geometry of the host (cellulose) and the target (enantiomer), a docking simulation (generally followed for protein‐ligand binding calculation) was used for finding the lowest energy position to measure molecular dynamic simulation. The typical boundary of the simulation box was set as 45 × 45 × 45 Grid size with a resolution of 0.4 Å in a flexible mode.…”

Section: Methodsmentioning

confidence: 99%

Spin‐Controlled Helical Quantum Sieve Chiral Spectrometer

et al. 2023

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This article reports on a molecular‐spin‐sensitive‐antenna (MSSA) that is based on stacked layers of organically functionalized graphene on a fibrous helical cellulose network for carrying out spatiotemporal identification of chiral enantiomers. The MSSA structures combine three complementary features: (i) chiral separation via a helical quantum sieve for chiral trapping, (ii) chiral recognition by a synthetically implanted spin‐sensitive center in a graphitic lattice; and (iii) chiral selectivity by a chirality‐induced‐spin mechanism that polarizes the local electronic band‐structure in graphene through chiral‐activated Rashba spin–orbit interaction field. Combining the MSSA structures with decision‐making principles based on neuromorphic artificial intelligence shows fast, portable, and wearable spectrometry for the detection and classification of pure and a mixture of chiral molecules, such as butanol (S and R), limonene (S and R), and xylene isomers, with 95–98% accuracy. These results can have a broad impact where the MSSA approach is central as a precautionary risk assessment against potential hazards impacting human health and the environment due to chiral molecules; furthermore, it acts as a dynamic monitoring tool of all parts of the chiral molecule life cycles.

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Section: Methodsmentioning

confidence: 99%

Spin‐Controlled Helical Quantum Sieve Chiral Spectrometer

et al. 2023

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“…The 4 n 2 limit is based on geometrical optics, and it pursues surface decoration of both sides of the thin film in order to increase the optical power in the film. More recently, it was suggested and demonstrated that the 4 n 2 limit can be exceeded if surface decoration with subwavelength structures is employed. − Various light trapping mechanisms were identified to produce broadband absorption enhancement of the sun power with surface subwavelength arrays: low optical impedance using arrays of nanocones and black silicon, − forward scattering by surface Mie resonators, increase in local density of states, excitations of Bloch modes, light trapping driven by light concentration and the utilization of nanolenses and light funnels, − excitations of localized Mie resonances, ,, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Light Trapping in Silicon Arrays of Deep Subwavelength Features for Absorption of the Solar Radiation

Prajapati

Shalev

2023

ACS Appl. Energy Mater.

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Absorption of the sun spectrum in silicon thin films is imperative to a range of technologies concerned with harvesting of the solar energy. Silicon surfaces decorated with subwavelength structures offer an attractive paradigm for the generation of broadband absorption enhancement. The integration of additional deep subwavelength features can provide further enhancement in broadband absorption. It was recently shown that the incorporation of nanopillar arrays with deep subwavelength sidewall structures (DSSS) can increase the omnidirectional broadband absorption performance. These arrays are referred to as DSSS arrays. In the current work, a numerical examination of the underlying light trapping mechanisms of such systems is presented. It is shown that the incorporation of DSSS concludes increase in the absorption cross-section of the individual structures composing the arrays. Particularly, enhanced absorption cross-section is obtained for sparse arrays which is indicative that the DSSS induces additional scattering inside the individual structures. In dense nanopillar arrays, the absorption cross-section decreases but the overall broadband absorption of the arrays increases due to the increase in material density. In dense DSSS arrays, further enhancement in broadband absorption, compared with the NP arrays, is calculated due to optical interactions between adjacent structures which yield an elevated absorption cross-section. Overall, the increase in broadband absorption in compact DSSS arrays is on account of the elevated light trapping induced by the DSSS; the presence of DSSS increases both the scattering inside the individual structures as well as the scattering between adjacent structures.

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“…As a result, the electronic and optical properties of SiNWs can be engineered using the topdown and bottom-up techniques. [6,7] The obtained SiNWs exhibit unique optical properties, such as the scattering, absorption, transmission of light, and roomtemperature light emission. [8,9] Moreover, SiNW arrays with a high aspect ratio can be applied as matrices to deposit functional materials without additional material/surface contamination caused by a catalyst.…”

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confidence: 99%

Spectromicroscopy Studies of Silicon Nanowires Array Covered by Tin Oxide Layers

Turishchev

Schleusener

Chuvenkova

et al. 2023

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MAWCE) is a simple and low-cost approach to fabricate SiNWs with designable doping nature. In this technique, SiNWs are fabricated by nonuniform etching of silicon (Si) substrates, catalyzed by the electroless deposition of metal nanoparticles in aqueous acidic solutions. [4,5] This technique involves only wet chemical processing under near ambient conditions, leading to a low-cost operation. As a result, the electronic and optical properties of SiNWs can be engineered using the topdown and bottom-up techniques. [6,7] The obtained SiNWs exhibit unique optical properties, such as the scattering, absorption, transmission of light, and roomtemperature light emission. [8,9] Moreover, SiNW arrays with a high aspect ratio can be applied as matrices to deposit functional materials without additional material/surface contamination caused by a catalyst. Tin dioxide (SnO 2 ) is an essential functional metal oxide. SnO 2 thin films can be grown easily using different deposition techniques, such as spray pyrolysis, [10] sputtering, [11] laser ablation, [12] or chemical vapor deposition. [13] For specific applications, such as gas sensors, large specific surface areas are required to increase the sensor's performance. In this respect, low-dimensional nanostructures with the large specific surface areas can be used. In most cases, one-dimensional (1D) nanostructures, such as SnO 2 nanowires, can be controlled grown via a bottomup vapor-liquid-solid mechanism and MOCVD approach is one of the most promising 3D developed surface effective functionalization. [14][15][16][17] Despite its broad applications, weak fundamental studies on low-dimensional tin oxide nanostructures have been reported, particularly ones regarding the functionalization compatibility with other materials. This study reports the electronic structure specificity of low-dimensional SnO 2 nanostructures under common formation regimes and possible interatomic interactions under the phase composition formation, including measurements at the microscopic level. For extensively studying the composition and morphology of a sample's surface small areas at "one spot," spectromicroscopy techniques have been used. [18][19][20][21] For instance, the surface-sensitive soft X-ray absorption edge analysis has been conducted for studying the composite structure of Si-O [22][23][24][25] and Sn-O systems. [26][27][28][29] As the X-ray absorption fine structure is extremely sensitive to the The composition and atomic and electronic structure of a silicon nanowire (SiNW) array coated with tin oxide are studied at the spectromicroscopic level. SiNWs are covered from top to down with a wide bandgap tin oxide layer using a metal-organic chemical vapor deposition technique. Results obtained via scanning electron microscopy and X-ray diffraction showed that tin-oxide nanocrystals, 20 nm in size, form a continuous and highly developed surface with a complex phase composition responsible for the observed electronic structure transformation. The "one spot" combination, containing a chemic...

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Enhancing the electronic properties of VLS-grown silicon nanowires by surface charge transfer

Cited by 6 publications

References 40 publications

Spin‐Controlled Helical Quantum Sieve Chiral Spectrometer

Spin‐Controlled Helical Quantum Sieve Chiral Spectrometer

Light Trapping in Silicon Arrays of Deep Subwavelength Features for Absorption of the Solar Radiation

Spectromicroscopy Studies of Silicon Nanowires Array Covered by Tin Oxide Layers

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