Journal article
Broadband infrared absorption enhancement by electroless-deposited silver nanoparticles
Department of Photonics Engineering, Technical University of Denmark1
University of Southern Denmark2
Center for Electron Nanoscopy, Technical University of Denmark3
Peter Grünberg Institute4
Metamaterials, Department of Photonics Engineering, Technical University of Denmark5
Center for Nanostructured Graphene, Centers, Technical University of Denmark6
Structured Electromagnetic Materials, Department of Photonics Engineering, Technical University of Denmark7
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.
Language: | English |
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Publisher: | De Gruyter |
Year: | 2017 |
Pages: | 289-297 |
ISSN: | 21928614 and 21928606 |
Types: | Journal article |
DOI: | 10.1515/nanoph-2016-0114 |
ORCIDs: | Kadkhodazadeh, Shima , Malureanu, Radu , Mortensen, N. Asger and Lavrinenko, Andrei |