Plasmonic light-sensitive skins of nanocrystal monolayers

Date
2013
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Source Title
Nanotechnology
Print ISSN
0957-4484
Electronic ISSN
Publisher
IOP Publishing
Volume
24
Issue
15
Pages
155201-1 - 155201-8
Language
English
Type
Article
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Abstract

We report plasmonically coupled light-sensitive skins of nanocrystal monolayers that exhibit sensitivity enhancement and spectral range extension with plasmonic nanostructures embedded in their photosensitive nanocrystal platforms. The deposited plasmonic silver nanoparticles of the device increase the optical absorption of a CdTe nanocrystal monolayer incorporated in the device. Controlled separation of these metallic nanoparticles in the vicinity of semiconductor nanocrystals enables optimization of the photovoltage buildup in the proposed nanostructure platform. The enhancement factor was found to depend on the excitation wavelength. We observed broadband sensitivity improvement (across 400-650 nm), with a 2.6-fold enhancement factor around the localized plasmon resonance peak. The simulation results were found to agree well with the experimental data. Such plasmonically enhanced nanocrystal skins hold great promise for large-area UV/visible sensing applications.

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Keywords
Semiconductor Nanocrystals, Solar-cells, Broad-band, Enhancement, Devices
Citation
Published Version (Please cite this version)