UK researchers say that introducing goldtitanium plasmonic nanostructures next to the electrical contacts of a graphene photodetector can significantly enhance its maximum voltage. The nanostructures convert incident light and into plasmonic oscillations and guide electromagnetic energy to the detector's pn junction.
The team performed several experiments to find the best geometries of the nanostructures. The best performance was given a comb structure (see photo above) - which caused the photovoltage to increase by up to a factor of 20.
Posted: Nov 09,2011 by Ron Mertens