All-Polymer Solar Cells Based on Fully Conjugated Donor-Acceptor Block Copolymers with Poly(naphthalene bisimide) Acceptor Blocks: Device Performance and Thin Film Morphology

Figure 3

AFM height images of P3HT:P2 ((a) Entry 4, (b) Entry 6, and (c) Entry 7 in Table 1) and (d) P3HT:PNBI blend thin films (3 μm × 3 μm).

(a)

(b)

(c)

(d)