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  • Additional co-authors Kim Kisslinger and Lihua Zhang (not shown) performed high-resolution electron microscopy measurements at the Center for Functional Nanomaterials..
    Brookhaven National Laboratory
    Additional co-authors Kim Kisslinger and Lihua Zhang (not shown) performed high-resolution electron microscopy measurements at the Center for Functional Nanomaterials..
  • Study co-authors Nanditha Dissanayake, Matthew Eisaman, Yutong Pang, and Ahsan Ashraf in a laser lab at Brookhaven.
    Brookhaven National Laboratory
    Study co-authors Nanditha Dissanayake, Matthew Eisaman, Yutong Pang, and Ahsan Ashraf in a laser lab at Brookhaven.
  • Left:Schematic of a graphene field-effect-transistor used in this study.  The device consists of a solar cell containing graphene stacked on top of a high-performance copper indium gallium diselenide (CIGS) semiconductor, which in turn is stacked on an industrial substrate (either soda-lime glass, SLG, or sodium-free borosilicate glass, BSG). The research revealed that the SLG substrate serves as a source of sodium doping, and improved device performance in a way not seen in the sodium-free substrate. Right: A scanning electron micrograph of the device as seen from above, with the white scale bar measuring 10 microns, and a transmission electron micrograph inset of the CIGS/graphene interface where the white scale bar measures 100 nanometers.
    Brookhaven National Laboratory
    Left:Schematic of a graphene field-effect-transistor used in this study. The device consists of a solar cell containing graphene stacked on top of a high-performance copper indium gallium diselenide (CIGS) semiconductor, which in turn is stacked on an industrial substrate (either soda-lime glass, SLG, or sodium-free borosilicate glass, BSG). The research revealed that the SLG substrate serves as a source of sodium doping, and improved device performance in a way not seen in the sodium-free substrate. Right: A scanning electron micrograph of the device as seen from above, with the white scale bar measuring 10 microns, and a transmission electron micrograph inset of the CIGS/graphene interface where the white scale bar measures 100 nanometers.
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