Figure 1. Topography of P(NDI2OD-T2) submonolayer and films deposited on glass substrates.

AFM images of P(NDI2OD-T2) films spin-coated from solutions with concentration of (a) 0.1 g l⁻¹, (b) 0.5 g l⁻¹, (c) 0.8 g l⁻¹, (d) 0.9 g l⁻¹, (e) 1 g l⁻¹ and (f) 5 g l⁻¹. In g the profile analysis of a–c and f is reported. (h) Sketch of the bar-coating process. (i) AFM picture of a submonolayer deposited by bar-coating a 0.5 g l⁻¹ solution in mesitylene. (j) AFM picture of a highly oriented film realized by bar-coating of a 5 g l⁻¹ solution in mesitylene. Scale bars, 1 μm.