Design and optimization of Ag-dielectric core-shell nanostructures for silicon solar cells

Metal-dielectric core-shell nanostructures have been proposed as a light trapping scheme for enhancing the optical absorption of silicon solar cells. As a potential application of such enhanced effects, the scattering efficiencies of three core-shell structures (Ag@SiO2, Ag@TiO2, and Ag@ZrO2) are di...

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Bibliographic Details
Published in:AIP advances 2015-09, Vol.5 (9), p.097129-097129-6
Main Authors: Chen, Feng-Xiang, Wang, Xi-Cheng, Xia, Dong-Lin, Wang, Li-Sheng
Format: Article
Language:English
Subjects:
Core-shell structure
Design optimization
Light scattering
Mie scattering
Nanoparticles
Nanostructure
Photovoltaic cells
Refractivity
Silicon dioxide
Silicon wafers
Silver
Solar cells
Titanium dioxide
Zirconium dioxide
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Summary:Metal-dielectric core-shell nanostructures have been proposed as a light trapping scheme for enhancing the optical absorption of silicon solar cells. As a potential application of such enhanced effects, the scattering efficiencies of three core-shell structures (Ag@SiO2, Ag@TiO2, and Ag@ZrO2) are discussed using the Mie Scattering theory. For compatibility with experiment results, the core diameter and shell thickness are limited to 100 and 30 nm, respectively, and a weighted scattering efficiency is introduced to evaluate the scattering abilities of different nanoparticles under the solar spectrum AM 1.5. The simulated results indicate that the shell material and thickness are two key parameters affecting the weighted scattering efficiency. The SiO2 is found to be an unsuitable shell medium because of its low refractive index. However, using the high refractive index mediumTiO2 in Ag@TiO2 nanoparticles, only the thicker shell (30 nm) is more beneficial for light scattering. The ZrO2 is an intermediate refractive index material, so Ag@ZrO2 nanoparticles are the most effective core-shell nanostructures in these silicon solar cells applications.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4930957