High efficiency graphene solar cell by chemical doping

ORAL

Abstract

We demonstrate single layer graphene/n-Si Schottky junction solar cells that under AM1.5 illumination exhibit a power conversion efficiency (PCE) of 8.6{\%}. This performance, achieved by doping the graphene with bis(trifluoromethanesulfonyl)amide (TFSA), exceeds the native (undoped) device performance by a factor of 4.5 and is the highest PCE reported for graphene-based solar cells to date. Current--voltage, capacitance--voltage, and external quantum efficiency measurements show the enhancement to be due to the doping-induced shift in the graphene chemical potential that increases the graphene carrier density (decreasing the cell series resistance) and increases the cell's built-in potential (increasing the open circuit voltage) both of which improve the solar cell fill factor.

*This work is supported by the Office of Naval Research (ONR) under Contract Number 00075094 (B.R.A.) and by the National Science Foundation (NSF) under Contract Number 1005301 (A.F.H.).

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Authors

  • Xiaochang Miao

    • Department of Physics, University of Florida, Gainesville, Florida 32611, United States

  • Sefaattin Tongay

    • Department of Physics, University of Florida, Gainesville, Florida 32611, United States

  • Maureen K. Pettterson

    • Department of Physics, University of Florida, Gainesville, Florida 32611, United States

  • Kara Berke

    • Department of Physics, University of Florida, Gainesville, Florida 32611, United States

  • Andrew G. Rinzler

    • Department of Physics, University of Florida, Gainesville, Florida 32611, United States

  • Bill R. Appleton

    • Nanoscience Institute for Medical and Engineering Technologies, University of Florida, Gainesville, Florida 32611, United States

  • Arthur Hebard

    • University of Florida
    • Physics department, University of Florida, Gainesville, Florida
    • Department of Physics, University of Florida
    • Department of Physics, University of Florida, Gainesville, Florida 32611, United States
    • Department of Physics, University of Florida, Gainesville FL 32611-8440