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Energy diagrams of G/n-Si and G/p-Si Schottky junctions upon light illumination. The energy diagrams of G/n-Si (a) and G/p-Si (b) Schottky junctions upon light illumination, respectively. ΦG/ΦSi and EFG/EFSi denote the work functions and Fermi energy levels of graphene/Si. χSi is the electron affinity of silicon. EC and EV are the conduction band and valence band of silicon, respectively.
