(a)

(b)

(c)

(d)

Figure 7: SEM photograph of pentacene films on NC-films with various doped content: (a) neat PVP 9 wt%(cross-linked), (b) PVP+TiO2 1 wt%, (c) PVP+TiO2 3 wt%, and (d) PVP+TiO2 5 wt%.