Broadband infrared absorption enhancement by electroless-deposited silver nanoparticles

Claudia Gritti, Søren Raza, Shima Kadkhodazadeh, Beata Kardynal, Radu Malureanu, N. Asger Mortensen, Andrei Lavrinenko

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Abstract

Decorating semiconductor surfaces with plasmonic nanoparticles (NPs) is considered a viable solution
for enhancing the absorptive properties of photovoltaic and photodetecting devices. We propose to deposit silver NPs on top of a semiconductor wafer by a cheap and fast electroless plating technique. Optical characterization confirms that the random array of electroless-deposited NPs improves absorption by up to 20% in a broadband of nearinfrared frequencies from the bandgap edge to 2000 nm. Due to the small filling fraction of particles, the reflection in the visible range is practically unchanged, which points to the possible applications of such deposition method for harvesting photons in nanophotonics and photovoltaics. The broadband absorption is a consequence of the resonant behavior of particles with different shapes and sizes, which strongly localize the incident light at the interface of a high-index semiconductor substrate. Our hypothesis is substantiated by examining the plasmonic response of the electroless-deposited NPs using both electron energy loss spectroscopy and numerical calculations.
Original languageEnglish
JournalNanophotonics
Volume6
Issue number1
Pages (from-to)289–297
ISSN2192-8606
DOIs
Publication statusPublished - 2017

Bibliographical note

©2016, Andrei V. Lavrinenko et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords

  • Plasmonic nanoparticles
  • Absorption enhancement
  • Random nanoparticles
  • Electroless plating
  • Electron energy loss spectroscopy

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