Figure 3.
AFM topography of ternary PBDTTT-C:Cy7-T:PC70BM films with proportions (a) 1:0:1.5, (b) 0.7:0.3:1.5, (c) 0.5:0.5:1.5 and (d) 0.3:0.7:1.5. The scale bar is 1 μm.
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