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Plasmonics

, Volume 13, Issue 5, pp 1603–1613 | Cite as

Discrete Optical Field Manipulation by Ag-Al Bilayer Gratings for Broadband Absorption Enhancement in Thin-Film Solar Cells

  • Yifu Chen
  • Long Wen
  • Xin Hu
  • Run Xu
  • Qin Chen
Article
  • 170 Downloads

Abstract

Plasmonic gratings have been widely used for light harvesting in thin-film solar cells (TFSCs). However, the detrimental parasitic metal absorption loss limits the actual light absorption in the active layer and reduces the power conversion efficiency. In this paper, it is found that the localized surface plasmon resonance (LSPR) used to increase long-wavelength light absorption has significant field concentration around the bottom corners of metal gratings, but the field distribution for the short-wavelength absorption band localizes around the top corners of gratings. Due to the differences between the spatial field distributions and the related mechanisms of metal loss, discrete optical field manipulation is proposed to suppress the ohmic loss mainly associated with LSPR and the interband transition loss associated with metal materials by using Ag-Al bilayer gratings, where Ag has a small absorption coefficient and Al has a high plasmon frequency. Fifteen to forty percent improvements of photocurrents in TFSCs with Ag-Al bilayer gratings are observed in simulation compared to the ones with single-layer metal gratings. This combined metal nanostructure scheme suppresses the loss issue of metal and extends the application potential of plasmonic light-harvesting techniques.

Keywords

Surface plasmon Grating Thin-film solar cells 

Notes

Funding Information

This work was supported by the grants from the National Natural Science Foundation of China (Nos. 11604367, 11774099, 11774383, and 61574158), the National Key Research and Development Program of China (No. 2016YFB0402501), the Key Frontier Scientific Research Program of the Chinese Academy of Sciences (No. QYZDB-SSW-JSC014), the Natural Science Foundation of Jiangsu Province (No. BK20150369), and the Suzhou Science and Technology Development Program Foundation (No. SYG201529).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  • Yifu Chen
    • 1
    • 2
  • Long Wen
    • 2
    • 3
  • Xin Hu
    • 2
  • Run Xu
    • 1
  • Qin Chen
    • 2
    • 3
  1. 1.School of Materials Science and EngineeringShanghai UniversityShanghaiPeople’s Republic of China
  2. 2.Key Lab of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences (CAS)SuzhouPeople’s Republic of China
  3. 3.Institute of NanophotonicsJinan UniversityGuangzhouPeople’s Republic of China

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