Coupled, large-area gold nanowire arrays for nanorectenna energy conversion

Richard M. Osgood III; Stephen Giardini; Joel Carlson; Brian Kimball; Megan Hoey; Gustavo E. Fernandes; Zhijun Liu; Jin Ho Kim; Jimmy Xu; Walter Buchwald

doi:10.1117/12.860174

10 September 2010 Coupled, large-area gold nanowire arrays for nanorectenna energy conversion

Richard M. Osgood III, Stephen Giardini, Joel Carlson, Brian Kimball, Megan Hoey, Gustavo E. Fernandes, Zhijun Liu, Jin Ho Kim, Jimmy Xu, Walter Buchwald

Author Affiliations +

Proceedings Volume 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII; 775715 (2010) https://doi.org/10.1117/12.860174
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

Abstract

Arrays of "nanorectennas", consisting of nanodiode-coupled nanoantennas, are of interest for converting visible/near-infrared (vis/nir) light into useful direct current. For efficient energy conversion, the nanoantenna array must have a high absorbance (for different polarizations and angles of incidence) and a large fill factor; i.e., the nanoantennas must be tightly packed together. We fabricate hexagonal, close-packed (~ 100 nm nearest neighbor separation), large area (~ 1 cm²) arrays of vertical (e.g., perpendicular to the substrate) Au nanowires (length < 1 μm) on Si, by electrochemically depositing gold into a porous aluminum oxide template (a potentially inexpensive process scalable to large dimensions). Coupling of these nanowires causes a considerable blue-shift of the plasmonic resonance of a single Au nanowire when illuminated by p-polarized light from the infrared to the blue-green portion of the visible spectrum (similar to the s polarization resonance), enabling a nanorectenna with tuned response in the vis/nir regime, whose absorption is roughly polarization-independent and relatively insensitive to angle of incidence. We measure the off-normal reflectivity of these arrays, compare with simulations, and present experimental data on rectification and power generation in the attached Au-Si Schottky nanodiodes.

Citation Download Citation

Richard M. Osgood III, Stephen Giardini, Joel Carlson, Brian Kimball, Megan Hoey, Gustavo E. Fernandes, Zhijun Liu, Jin Ho Kim, Jimmy Xu, and Walter Buchwald "Coupled, large-area gold nanowire arrays for nanorectenna energy conversion", Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 775715 (10 September 2010); https://doi.org/10.1117/12.860174

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