Graphene and semiconductor based Schottky junction solar cells (SJSCs) have recently shown rapid increase of power conversion efficiency with simple structure and easy fabrication process, thereby being considered as a promising alternative to conventional p-n junction solar cells. Such a rapid enhancement of the PEC, yet it is still lower than the best record of the metal/Si Schottky junction solar cells (20 %), illustrates that the junction-potential plays an importance role of the cell performance. Graphene show the electrically tunable Fermi level, optical transparency, and substantial permeability to electric field and it means that remains lot of room for improvement of PCE. In this study, we introduced graphene and graphene mesh sheets as Schottky electrodes on n-Si SJSCs and investigated their power generation characteristics depending on the Vg applied to the cells. Compared with the SJSC with graphene, the cell with graphene mesh exhibited a higher PCE and a more sensitive response to photovoltaic parameters at Vg. The advantages of the graphene mesh can be attributed to the existence of holes that increase the work function and permeability across the electric-field.