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  • Title: High efficiency graphene solar cells by chemical doping.
    Author: Miao X, Tongay S, Petterson MK, Berke K, Rinzler AG, Appleton BR, Hebard AF.
    Journal: Nano Lett; 2012 Jun 13; 12(6):2745-50. PubMed ID: 22554195.
    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, 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.
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