Light trapping and optical absorption enhancement in vertical semiconductor Si/SiO_2 nanowire arrays

The full potential of optical absorption property must be further cultivated before silicon（Si） semiconductor nanowire（NW） arrays become available for mainstream applications in optoelectronic devices. In this paper, we demonstrate both experimentally and theoretically that an SiO_2 coating can subs...

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Bibliographic Details
Published in:中国物理B：英文版 2018, Vol.27 (2), p.482-485
Main Authors: 王莹, 李新化
Format: Article
Language:English
Subjects:
光吸收
半导体
数组
垂直
应用程序
吸收性质
试验性
时间域
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Summary:The full potential of optical absorption property must be further cultivated before silicon（Si） semiconductor nanowire（NW） arrays become available for mainstream applications in optoelectronic devices. In this paper, we demonstrate both experimentally and theoretically that an SiO_2 coating can substantially improve the absorption of light in Si NW arrays.When the transparent SiO_2 shell is coated on the outer layer of Si NW, the incident light penetrates better into the absorbing NW core. We provide the detailed theoretical analysis by a combination of finite-difference time-domain（FDTD） analysis.It is demonstrated that increasing the thickness of the dielectric shell, we achieve 1.72 times stronger absorption in the NWs than in uncoated NWs.
ISSN:1674-1056
2058-3834