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(Color online) (a) Schematic illustration of graphene/BFO/Pt solar cell configuration. (b) Cross section view of the graphene/BFO/Pt solar cell. (c) Photographic image of the graphene/BFO/Pt solar cell.
(Color online) (a) Raman spectrum of as-deposited graphene showing G and 2D peaks. 2D micro-Raman intensity mapping of (b) G band (1587 cm−1) and (c) 2D band (2690 cm−1). (d) 2D micro-Raman intensity ratio (I 2D/I G) mapping from the same region as (c) and (d). (e) UV-Vis spectrum of transferred graphene film on quartz substrate.
(Color online) (a) XRD pattern of as-grown BFO thin film. (b) J-V curves of the graphene/poly-BFO/Pt heterojunction in the dark and with white light illumination. (c) Time dependence of zero bias photocurrent density with light ON and OFF.
(Color online) (a) Photocurrent density (J sc) and open circuit voltage (V oc) variation with different HNO3 treatment time. Inset: graphene sheet resistance variation with different HNO3 treatment time. (c) Energy band diagram of the graphene/BFO/Pt heterojunction structure upon illumination.
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