Plasmonic light trapping for wavelength-scale silicon solar absorbers

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• 作者：Yinan Zhang ; Min Gu
• 关键词：solar cells ; light trapping ; plasmonic ; ultrathin Si ; wavelength ; scale
• 刊名：Frontiers of Optoelectronics in China
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：9
• 期：2
• 页码：277-282
• 全文大小：682 KB
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• 作者单位：Yinan Zhang (1)
  Min Gu (1) (2)
  
  1. Centre for Micro-Photonics, Faculty of Science, Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn VIC, 3122, Australia
  2. Artificial-Intelligence Nanophotonics Laboratory, School of Science, RMIT University, Melbourne VIC, 3001, Australia
  
• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  Electromagnetism, Optics and Lasers
  Biomedical Engineering
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-2767

文摘

Light trapping is of critical importance for constructing high efficiency solar cells. In this paper, we first reviewed the progress we made on the plasmonic light trapping on Si wafer solar cells, including Al nanoparticle (NP)/SiN _x hybrid plasmonic antireflection and the Ag NP light trapping for the long-wavelength light in ultrathin Si wafer solar cells. Then we numerically explored the maximum light absorption enhancement by a square array of Ag NPs located at the rear side of ultrathin solar cells with wavelength-scale Si thickness. Huge absorption enhancement is achieved at particular long wavelengths due to the excitation of the plasmon-coupled guided resonances. The photocurrent generated in 100 nm thick Si layers is 6.8 mA/cm2, representing an enhancement up to 92% when compared with that (3.55 mA/cm2) of the solar cells without the Ag NPs. This study provides the insights of plasmonic light trapping for ultrathin solar cells with wavelength-scale Si thickness.