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

Figure 1

(a) FTIR spectra of PY2, (b) transmittance spectra, (c) pH value, and (d) resistivity of the films formed by PY1, PY2, PY3, PY4, PY5, and PEDOT : PSS.

(a)

(b)

(c)

(d)