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Light trapping and surface plasmon enhanced high-performance NIR photodetector.

Lin-Bao Luo1, Long-Hui Zeng1, Chao Xie2

  • 11] School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, Anhui 230009, P. R. China [2] Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei, Anhui 230009, P. R. China.

Scientific Reports
|January 29, 2014
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Summary

Researchers developed a high-performance near-infrared (NIR) photodetector using gold nanoparticles on graphene-coated silicon nanowires. This device enhances light absorption for improved detection in applications like military surveillance and light vision.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Near-infrared (NIR) photodetectors are crucial for applications including military surveillance, target detection, and light vision.
  • Silicon nanowire (SiNW) arrays offer potential for photodetector fabrication due to their unique electronic and optical properties.

Purpose of the Study:

  • To fabricate and characterize a high-performance NIR photodetector.
  • To investigate the light-trapping mechanisms in a novel heterojunction nanostructure.

Main Methods:

  • Fabrication of a heterojunction photodetector by coating methyl-group terminated SiNW array with gold nanoparticles (AuNPs) decorated graphene film.
  • Utilizing finite element method (FEM) for theoretical simulation of light-matter interactions.
  • Analysis of surface passivation effects on device performance.

Main Results:

  • The fabricated AuNPs@graphene/CH3-SiNWs array demonstrated high performance for NIR light detection.
  • FEM simulations confirmed that AuNPs on graphene efficiently trap incident NIR light into the SiNW array via surface plasmon polariton (SPP) excitation and coupling.
  • Surface passivation and efficient light coupling contribute to a high on-off ratio.

Conclusions:

  • The developed AuNPs@graphene/CH3-SiNWs heterojunction is a promising platform for high-performance NIR photodetectors.
  • The combination of plasmonic nanoparticles, graphene, and SiNWs effectively enhances NIR light absorption and device performance.
  • This approach offers a pathway for advanced optoelectronic device development in surveillance and imaging.