fig2

Figure 2. Figure 2A-C, D-F and G-I are digital photos, AFM morphology images and line profile graphs of AFM morphology of PBED, P(BED-T), P(BED-TT) films prepared by spray-spin coating polymerization method, respectively. Notes: the insets in Figure 2A-C shows the chemical structure corresponding to the PBEDs film and AFM morphology image of films scan area is 10 μm × 10 μm. AFM: atomic force microscopy; BED-T: 2,5-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)thiophene; BED-TT: 2,5-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)thieno[3,2-b]thiophene.