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Applied Physics Letters / Volume 96 / Issue 18 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 96, 181903 (2010); http://dx.doi.org/10.1063/1.3427407 (3 pages)

Comparison of optical absorption in Si nanowire and nanoporous Si structures for photovoltaic applications

Zhiqiang Xiong1, Fangyuan Zhao1, Jiong Yang2, and Xinhua Hu1

1Department of Material Science, Laboratory of Advanced Materials, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, People’s Republic of China
2Department of Physics, Surface Physics Laboratory, Fudan University, Shanghai 200433, People’s Republic of China

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(Received 19 November 2009; accepted 16 April 2010; published online 6 May 2010)

We numerically study the optical absorption in Si nanowire and nanoporous Si structures that have potential applications in solar cells. It is found that for the same thickness and filling ratio of Si, thin nanoporous structures can have much higher absorption than thin Si nanowire arrays. Above a critical filling ratio of Si (0.25), the nanoporous structures can have higher absorption even than thin films with the same thickness. For solar cells based on thin nanoporous Si structures, the maximal ultimate efficiency occurs when the filling ratio is around 0.3.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

elemental semiconductors, nanoporous materials, nanowires, optical constants, photovoltaic effects, silicon, solar cells

PACS

  • 61.46.-w

    Structure of nanoscale materials

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

  • 72.40.+w

    Photoconduction and photovoltaic effects

  • 78.66.Db

    Elemental semiconductors and insulators

  • 88.40.H-

    Solar cells (photovoltaics)

  • 61.43.Gt

    Powders, porous materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3427407

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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