title: Characterization of plasmonic hole arrays as transparent electrical contacts for organic photovoltaics using high-brightness Fourier transform methods.
abstract: We present a methodology for probing light-matter interactions in prototype photovoltaic devices consisting of an organic semiconductor active layer with a semitransparent metal electrical contact exhibiting surface plasmon-based enhanced optical transmission. We achieve high-spectral irradiance in a spot size of less than 100 μm using a high-brightness laser-driven light source and appropriate coupling optics. Spatially resolved Fourier transform photocurrent spectroscopy in the visible and near-infrared spectral regions allows us to measure external quantum efficiency with high sensitivity in small-area devices (<1 mm2). This allows for rapid fabrication of variable-pitch sub-wavelength hole arrays in metal films for use as transparent electrical contacts, and evaluation of the evanescent and propagating mode coupling to resonances in the active layer.
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton , NY , USA.
authors.forename: Fernando E
authors.initials: FE
authors.lastname: Camino
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton , NY , USA.
authors.forename: Chang-Yong
authors.initials: CY
authors.lastname: Nam
authors.affiliation: Sustainable Energy Technologies, Brookhaven National Laboratory , Upton , NY , USA ; Department of Physics and Astronomy, Stony Brook University , Stony Brook , NY , USA.
authors.forename: Yutong T
authors.initials: YT
authors.lastname: Pang
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton , NY , USA ; Condensed Matter Physics and Materials Science, Brookhaven National Laboratory , Upton , NY , USA.
authors.forename: Jessica
authors.initials: J
authors.lastname: Hoy
authors.affiliation: Sustainable Energy Technologies, Brookhaven National Laboratory , Upton , NY , USA ; Department of Physics and Astronomy, Stony Brook University , Stony Brook , NY , USA.
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Eisaman
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton , NY , USA.
authors.forename: Charles T
authors.initials: CT
authors.lastname: Black
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton , NY , USA.
authors.forename: Matthew Y
authors.initials: MY
authors.lastname: Sfeir
keywords: Fourier transform photocurrent; high brightness spectroscopy; laser-driven light source; metal hole array; organic photovoltaic; plasmonic transparent contacts; plasmonics and nanophotonics