Fig. 2: FESEM and photographic images of PEDOT:DS films.

Surface morphologies of PEDOT:DS films on (a) SiO2-wafer, (b) PI, and (c) PET substrates (magnification: 100k ×) (d) cross-sectional image of PEDOT:DS film on PET substrate. (magnification: 200k × ; film thickness ~ 40 nm) All of the films were prepared with 30 wt% Fe(DS)3, and the polymerization temperature and time were 50 °C and 30 min, respectively. Photographic images of highly transparent PEDOT:DS films on PET (10 × 10 cm2): (e) flat and (f) roll-up sheets.