Improved Efficiency of Graphene/Si Heterojunction Solar Cells by Optimizing Hydrocarbon Feed Rate

Figure 2

Light current density-voltage curves of solar cells based on different graphene samples before (red lines) and after HNO₃ (black lines) treatment. (a) AC-0.01, (b) AC-0.02, (c) AC-0.04, and (d) AC-0.06.

(a)

(b)

(c)

(d)