Thickness Effect on F8T2/C₆₀ Bilayer Photovoltaic Devices

Figure 2

AFM height images of F8T2 polymer films coated on glass substrates for each thickness: (a) 18 nm, (b) 30 nm, (c) 40 nm, and (d) 60 nm. The scan size is 1.5 μm × 1.5 μm.

(a)

(b)

(c)

(d)