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. Author manuscript; available in PMC: 2017 Dec 7.
Published in final edited form as: Nanoscale. 2016 Nov 4;8(45):19043–19049. doi: 10.1039/c6nr07290a

Figure 4.

Figure 4

Schematic diagrams of band structures of a graphene transistor. (A) Photocurrent signals generate at graphene-metal junction areas due to the band structure bending. (B) A retina can modulate the carrier concentration of graphene underneath it. Green solid lines show potential profiles. Black dashed lines denote the Fermi levels. Note that in (A) and (B), the potential profiles are obtained through numerical integration of the scanning photocurrent profiles along the dashed lines in Figure 2H and 2D, respectively.