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Sekhon, Jagmeet Singh
- Study of Surface Plasmon Resonance (SPR) In a Nano-Structured Material
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1 Department of Physics, Sant Longowal Institute of Engineering and Technology, Longowal (Deemed to Be University), Distt.-Sangrur, (Punjab) 148-106, IN
1 Department of Physics, Sant Longowal Institute of Engineering and Technology, Longowal (Deemed to Be University), Distt.-Sangrur, (Punjab) 148-106, IN
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Research Journal of Engineering and Technology, Vol 2, No 4 (2011), Pagination: 227-230Abstract
In the present analysis, absorption spectrum of gold nanorod is modeled by Gans theory with the introduction of interband transition contribution to the dielectric function of the gold material. A linear relationship is found between the absorption maxima of longitudinal plasmon resonance and aspect ratio. Since the absorption maxima of the longitudinal plasmon resonance also depend on the refractive index value of the surrounding medium therefore, the surrounding medium in present analysis was taken as water with its refractive index value of 1.33. It is observed that with the increase in aspect ratio of gold nanorod the absorption intensity increases and the resonance wavelength shifts towards red regime of visible spectrum and further increase in the aspect ratio (~4) results a resonance wavelength in the near infrared regime. Further, a comparison with the results obtained for gold nanorods by the different theoretical models, like LC circuit model, discrete dipole approximation (DDA), experimental data, as well as the linear fit equation of experimental data was done to authenticate the parametric effect in present analysis on plasmon resonance in nano-structured materials (nanorod here). Our analytical results show a close agreement with linear curve fit equation of experimental data in comparison to the other models.Keywords
Surface Plasmon, Resonance, Aspect Ratio, Nanorod.
- Emitter Selection for Efficient Si Solar Cells:PC1D Simulations
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1 Department of Physics, Govind National College Narangwal,Govind Nagar, Narangwal, Ludhiana, 141203 (Pb), IN
1 Department of Physics, Govind National College Narangwal,Govind Nagar, Narangwal, Ludhiana, 141203 (Pb), IN
Source
Research Journal of Engineering and Technology, Vol 8, No 4 (2017), Pagination: 414-418Abstract
The p-n junction solar cell is investigated by PC1D simulation by keeping both p type and n type as a front/emitter side towards the irradiated solar spectrum. The calculated cell parameters viz. characteristics I-V, external quantum efficiency (EQE) and open circuit voltage (Voc) helps to analyze the efficiency of solar cells. The analysis indicated that the surface recombination in the short wavelength region on the front surface can be overcome by decreasing the n type front layer thickness and hence, improve the efficiency of cell. Moreover, the reflectance in the visible regime of solar spectrum can be reduced by increasing the p type layer thickness but this improvement is not believed to be significant and hence, the study suggests the n type as a better material for front side selection in comparisons to p type. Furthermore, the fill factor (FF) and power conversion efficiency (PCE) calculation helps to optimize the layer thickness. We have achieved an open circuit voltage of 723mV and a fill factor of about 84% at 0.5μm layer thickness of n type material.Keywords
Solar Cells, Si, EQE, Power Conversion Efficiency, Fill Factor.References
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