Enhanced Raman scattering from vertical silicon nanowires array

Huang, Jian‐An; Zhao, Ying; Zhang, Xue Jin; Luo, Lin; Liu, Yan Kuan; Zapien, Juan Antonio; Surya, C.; Lee, Shuit Tong

doi:10.1063/1.3584871

Cited by 25 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shift of Raman spectrum increases, while the laser wavelength changes from 785 to 514 nm due to the stronger light absorption [12]. In the case of VLS-and MACESiNWs, besides the downshift and broadening of Raman spectra, it was also observed an increase in the intensity of the Raman spectra relative to the Raman spectrum of c-Si under the same conditions [16][17][18][19]. The enhancement of Raman intensity was explained by an effect of partial light localization because of the strong light scattering in SiNW array [19].…”

mentioning

confidence: 95%

Raman diagnostics of photoinduced heating of silicon nanowires prepared by metal-assisted chemical etching

et al. 2015

View full text Add to dashboard Cite

mentioning

confidence: 95%

Raman diagnostics of photoinduced heating of silicon nanowires prepared by metal-assisted chemical etching

et al. 2015

View full text Add to dashboard Cite

“…(3). 24,30) In Eq. (3), q is the elementary charge, G the net carrier generation rate, L e the hole diffusion length, W the width of the deletion region, and L n the electron diffusion length.…”

Section: Resultsmentioning

confidence: 99%

“…3(b), owing to more scattering and light trapping. 23,24) However, after a 30 s etching time, the reflectance of the SiNW-textured Si wafer sharply increased and the SiNW length also increased. This might have resulted from the pyramidal structure etched by Ag particles.…”

Section: Experimental Methodsmentioning

confidence: 99%

Surface Texturing of Crystalline Silicon Solar Cell Using Silicon Nanowires

Seon¹,

Kang²,

Park³

et al. 2013

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

Surface texturing with silicon nanowires on a pyramidal structure was explored by simple metal-assisted chemical etching to improve the electrical performance of a silicon solar cell. The length of nanowires was controlled by changing the etching time in a H 2 O 2 /HF solution after Ag ion adsorption. The weighted reflectance from 300 to 1200 nm was reduced to as low as 4.6% with a 200-nm-long nanowire formed by 30 s etching, while the pyramid surface had a 12.3% reflectance before antireflection (AR) coating deposition. However, the surface textured with 200-nm-long silicon nanowires had a similar reflectance, even after AR coating, and a decreased conversion efficiency in the completed solar cell. Since the silicon wafer with 200-nm-long nanowires had a deep and narrow structure, the AR layer could not be deposited uniformly, which resulted in a low passivation quality and an antireflection effect. This means that the surface structure, even with low reflectance, cannot be appropriate in the cell fabrication process because it is not capable of improving the solar cell performance characteristics. On the other hand, the 30-nm-long nanowire-textured silicon solar cell formed by 2 s etching had a decreased reflectance and improved electrical properties. As a result, the 30-nmlong silicon nanowire-textured solar cell exhibited improved performance characteristics, ÁJ sc ¼ 0:3 mA/cm 2 , ÁV oc ¼ 2 mV, and Á ¼ 0:2%, compared with only a pyramidal textured surface. This suggests that a respectable quality in the passivation and antireflection layers, as well as reflectance reduction, in nanoscale-textured silicon solar cells is required for silicon solar cell performance.

show abstract

“…31,32 Briey, 300 nm polystyrene (PS) nanospheres were diluted with ethanol, then injected slowly onto the water surface to form a close-packed monolayer. Firstly, a layer of photoresist (PR) was coated on top to dene the area of the microuidic channel.…”

Section: Fabrication Of Ag/sinp Arrays In Microuidic Channelsmentioning

confidence: 99%

Plasmonic nanopillar array embedded microfluidic chips: an in situ SERS monitoring platform

et al. 2015

Self Cite

View full text Add to dashboard Cite

The incorporation of surface enhanced Raman spectroscopy (SERS) detection into microfluidic channels enables fast, damage-free and information-rich sensing and analysis, and it thereby triggers considerable research interest. However, conventional SERS systems rely on narrow spacing generated intense electromagnetic (EM) fields and usually suffer from low reproducibility, especially in the presence of dynamic liquids. In this paper, we report the fabrication of Ag/Si nanopillar (NP) array embedded microfluidic chips as an in situ SERS monitoring platform. This on-chip SERS system not only provides highly reproducible SERS signals in liquid based detection, but also is capable of large biomolecule detection, demonstrated by the detection of R6G and natural source double strand DNA. Such excellent SERS performances are attributed to the wide range and uniform enhancement field yielded by the propagating surface plasmon on an ordered Ag coated Si nanopillar structure upon laser illumination.Taking these advantages and using 4-ABT as a test case, we demonstrate that this SERS equipped microfluidic chip allows the in situ reaction of different chemicals and is capable of real-time monitoring of the reaction process. Electronic supplementary information (ESI) available: SEM of the polystyrene nanosphere close-packed array and Au nanoholes on top of silicon wafer. See

show abstract

Enhanced Raman scattering from vertical silicon nanowires array

Cited by 25 publications

References 15 publications

Raman diagnostics of photoinduced heating of silicon nanowires prepared by metal-assisted chemical etching

Raman diagnostics of photoinduced heating of silicon nanowires prepared by metal-assisted chemical etching

Surface Texturing of Crystalline Silicon Solar Cell Using Silicon Nanowires

Plasmonic nanopillar array embedded microfluidic chips: an in situ SERS monitoring platform

Contact Info

Product

Resources

About