Record High Efficiency Achievement under LED Light in Low Bandgap Donor-Based Organic Solar Cell through Optimal Design

Figure 2

AFM images of the films formed by (a) PEDOT : PSS, (b) PY1, (c) PY2, (d) PY3, (e) PY4, and (f) PY5.

(a)

(b)

(c)

(d)

(e)

(f)