title: Plasmonic light-sensitive skins of nanocrystal monolayers.
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.
authors.affiliation: UNAM-Institute of Materials Science and Nanotechnology, Department of Electrical and Electronics Engineering and Department of Physics, Bilkent University, Ankara, Turkey.
authors.forename: Shahab
authors.initials: S
authors.lastname: Akhavan
authors.forename: Kivanc
authors.initials: K
authors.lastname: Gungor
authors.forename: Evren
authors.initials: E
authors.lastname: Mutlugun
authors.forename: Hilmi Volkan
authors.initials: HV
authors.lastname: Demir