Characteristics of Nanostructure Silicon Photodiode using Laser Assisted Etching

Ahmed, Naser M.; Al‐Douri, Y.; Alwan, Alwan M.; Jabbar, Allaa A.; Arif, Ghassan E.

doi:10.1016/j.proeng.2013.02.051

Cited by 16 publications

(6 citation statements)

References 7 publications

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“…Where (L) is the grain size for Au, CNT, and Au-CNT in (nm), is the applied radiation's wavelength (λ), expressed in nanometers (nm), Full width at half maximum (FWHM) is expressed as (𝛽) (radians), diffraction angle is expressed as (Ɵ) (radians), and shape factor value is expressed as (0.9) [51][52].…”

Section: ) X-ray Diffraction Analysis Of Hybrid Structuresmentioning

confidence: 99%

New approach of creation and modifying the characteristics of AuNPs/MWCNT/PSi hybrid structures

Ali,

Alwan,

Jabbar

2023

Preprint

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In this paper, a new approach is presented on modifying the properties of hybrid structures of gold nanoparticles (AuNPs) and multi wall carbon nanotubes (MWCNT); deposited on morphologically controlled porous silicon (PSi) surface. The PSi layer was prepared by Photo-electrochemical etching using a current density between 15 to 30mA/cm2. The AuNPs/ MWCNT was decorated on a PSi surface by simple ion reduction from aqueous solutions of gold salt (HAuCl4) at 5\(\times\)10−2 M, 10− 2 M, 10− 3 M, and 10− 4 M concentrations. Structural, morphological and optical characterizations of (AuNPs/MWCNT/PSi) hybrid structure were analyzed with respect of the PSi layer morphology. The obtained results showed a possibility of effectively controlling the hybrid structures morphology, the AuNPs size and the surface area by controlling the pores’ diameters. The deposition of the MWCNT and AuNPs on the wall and pore may enhance the specific surface area of the hybrid structure. Moreover, the decrease of the concentration of the gold salt aqueous solution led a significant decrease of the AuNPs sizes, and this added another means to modify the hybrid structures.

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Section: ) X-ray Diffraction Analysis Of Hybrid Structuresmentioning

confidence: 99%

New approach of creation and modifying the characteristics of AuNPs/MWCNT/PSi hybrid structures

Ali,

Alwan,

Jabbar

2023

Preprint

Self Cite

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“…This could enhance the detection efficiency of the sensors towards the pesticide and hence; strengthen the Raman signal. The most important parameter for assessing the activity of the sensors, in addition to its linearity, is the signal enhancement factor (EF) was calculated from equation (5). Figure 11 illustrates the EF variation with the concentration of Chlorpyrifos pesticides solution and shows the stable performance of the mono and bimetallic SERS sensors without any saturation effects.…”

Section: Sensing Performance Of Nanophotonics Sers Pesticides Sensorsmentioning

confidence: 99%

“…Metals alloying is considered a way for developing new materials that have the best technological use as starting substances. Nanoparticles Alloy showed different physical and structural features than their bulk alloys [5]. The increase of solid solubility of the alloy components with particle size decrease is one of the prominent effects.…”

Section: Introductionmentioning

confidence: 99%

Sensing Performance of Mono and Bimetallic Nano Photonics Surface Enhanced Raman Scattering (SERS) Devices

Jubair¹,

Alwan²,

Hamoudi³

2021

ETJ

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In this research, sensing performance of mono and bimetallic nanophotonics SERS sensors of gold-silver nano-columns for the detection of chlorpyrifos was investigated. For optimum substrates for Gold-silver/nano-column surface-enhanced, Raman scattering (SERS) was achieved with the silicon substrate. By combining the Ag SERS activity with the Au chemical stability and nano-columns Si large field enhancement, the Au-Ag/nano-columns Si substrate revealed perfect reproducibility, homogeneity, sensitivity in addition to chemical stability. The sensors were tested by Atomic force microscope (AFM), field emission scanning electron microscope (FESEM), energy-dispersive X-ray analysis (EDS), and X-ray diffraction (XRD). Findings presented in this research indicated modified distributions and sizes of formed alloy nanoparticles, and the hot spots junctions within the nanophotonics layer after changing the nanoparticles types. The SERS sensors performance displayed an excellent recognition of ultra-low concentrations of chlorpyrifos solutions with an exponential relationship with the Raman signal. The highest enhancement factor (Ef=1.56×106) and minimum limit of detection 0.069 mg/Kg were obtained with Au-Ag sensors.

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“…On the other hand, nanostructured PS has emerged as an attractive material in the field of photoelectronics due to its broadband gap, wide optical transmission range, favorable absorption spectrum, and surface texture. The surface roughness and low effective refractive index which can reduce reflection losses of sunlight radiation are the primary benefits offered by PS over c-Si [3][4][5]. A highly porous PS layer can enhance the efficiency of solar cells by increasing light trapping in the active region [6], solving the lattice mismatch problem, and surface reflection is also corrected due to the refractive index of silicon as reported by several other authors [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Silicon Sensors

Mamedov¹

2020

Multilayer Thin Films - Versatile Applications for Materials Engineering

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Nanostructure porous silicon layers with systematically varied pore size of 8-70 nm were fabricated onto the p-type c-Si wafers using electrochemical anodizing method from HF + ethanol and HF + ethanol + CdCl 2 solutions (hereafter PS and PSCD, respectively). Gas and photo sensors based on c-Si/PS (or PSCD)/ CdS and c-Si/PS/Cd 0.4 Zn 0.6 O heterojunctions were synthesized by depositing CdS and Cd 0.4 Zn 0.6 O films onto the c-Si/PS (or PSCD) substrates by electrochemical deposition (ED hereafter). The morphology of the PS and PSCD layers, CdS, and Cd 0.4 Zn 0.6 O films was studied using scanning electron microscopy (SEM). Gas-and photosensitivity properties of heterojunctions were studied as a function of pore size. The optimal pore size is determined, which provides the maximum gas-and photosensitivity of heterojunctions in this study. It was established that the heterojunctions based on PSCD possess higher gas-and photosensitivity than heterojunctions based on PS.

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Characteristics of Nanostructure Silicon Photodiode using Laser Assisted Etching

Cited by 16 publications

References 7 publications

New approach of creation and modifying the characteristics of AuNPs/MWCNT/PSi hybrid structures

New approach of creation and modifying the characteristics of AuNPs/MWCNT/PSi hybrid structures

Sensing Performance of Mono and Bimetallic Nano Photonics Surface Enhanced Raman Scattering (SERS) Devices

Nanostructured Silicon Sensors

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