Figure 7.

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. Φ_G/Φ_Si and E_FG/E_FSi denote the work functions and Fermi energy levels of graphene/Si. χ_Si is the electron affinity of silicon. E_C and E_V are the conduction band and valence band of silicon, respectively.