Broad spectral photocurrent enhancement in Au-decorated CdSe nanowires
Di Fabrizio, Enzo M.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
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AbstractMetal-semiconductor hybrid nanostructures promise improved photoconductive performance due to plasmonic properties of the metal portions and intrinsic electric fields at the metal-semiconductor interface that possibly enhance charge separation. Here we report gold decorated CdSe nanowires as a novel functional material and investigate the influence of gold decoration on the lateral facets on the photoconductive properties. Gold decorated nanowires show typically an at least ten-fold higher photocurrent as compared to their bare counterparts. Interestingly, the photocurrent enhancement is wavelength independent, although the plasmon resonance related to the gold particles appears in the absorption spectra. Our experiments show that light scattering and Schottky fields associated with the metal-semiconductor interface are at the origin of the photocurrent enhancement. © 2013 The Royal Society of Chemistry.
SponsorsThe SPCM measurements were performed using LABVIEW so. ware developed by Dr. Stefan Kudera. The work was supported by the European Commissions Seventh Framework Program via the NANOANTENNA project (Contract Number: F5-2009 241818).
PublisherRoyal Society of Chemistry (RSC)