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a,c,e,g) AFM height images and b,d,f,h) phase images of PBDTTT‐C‐T:DC‐IDT2T films roll‐coated on PET/Ag/PEDOT:PSS PH1000/ZnO substrates: a,b) DCB; c,d) CF; e,f) CB; g,h) CB with thermal annealing. The scan size of all height images and all phase images is 500 × 500 nm.
