Effects of silver nanoparticles size and shape on light scattering

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• 作者：Shi-e Yang^a ; ^{yangshie@zzu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ping Liu^b ; Yu-jie Zhang^a ; Qiao-Neng Guo^a ; ^{gqin@zzu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yong-sheng Chen^a
• 关键词：Localized surface plasmon resonance ; Scattering cross section ; Scattering efficiency ; Coupling efficiency
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：127
• 期：14
• 页码：5722-5728
• 全文大小：1618 K

文摘

The scattering from metal nanoparticles near their localized surface plasmon resonance is a promising way to increase the light absorption in solar cells. In this article, we investigate the light scattering of silver (Ag) nanoparticles on the microcrystalline silicon (μc-Si) substrate with various sizes and shape by finite element method. The results show that large spherical particles lead to enhanced scattering efficiency, whereas reduced coupling efficiency. The scattering cross section and coupling efficiency are very sensitive to the shape of the particles. Compared with spherical particles, hemispherical and cylindrical particles show much lower and broader scattering cross section, containing two surface plasmon resonance modes, and much higher coupling efficiency at longer wavelengths. However, with the increase in the longitudinal size (or height) of the particles, the coupling efficiency decreases, especially at shorter wavelengths, due to backscattering by the longitudinal resonance mode. Finally, we simulate the absorption enhancement in μc-Si thin film solar cells by Ag nanoparticle arrays with various shape. These results will be useful for enhancing performance of the μc-Si thin film solar cells by optimizing the light-trapping design.