Figure 8
(a) Representative time-dependent GISAXS patterns taken with 100 ms resolution during spin-coating of the PTB7–PC71BM film from the sample solutions of CB without additive, over the spin-coating time indicated. The vertical arrows in (a) indicate the emergence and development of the vertical scattering stripes at qy ≃ 0.002 Å−1 over t = 2.4–2.8 s of the spin-coating time. (b) Parallel GISAXS patterns for the case with 3% DIO, showing no scattering stripes (see the movies in the supporting information for the complete spin-coating process). |