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The photovoltaic industry has been grown rapidly following the improvements in the efficiency and the demand for alternative energy resources.The graphene-based transparent and conductive films are demonstrated to be cost-effective electrodes for photovoltaic applications.Here we report that,as a key building block for photovoltaic devices,chemical vapour deposition(CVD)grown graphene vertical p-n junctions are fabricated by introducing n-type and p-type dopants.Functionalized vertical p-n graphene junctions display(1)high transmittance in the visible and near-infrared spectrum(2)low graphene sheet resistance(3)superior environmental stability.