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

Figure 4

(a) UPS spectra, (b) UV-vis absorption spectra, (c) Tauc plot obtained from the UV-vis absorption spectra of PEDOT : PSS and PY4, and (d) energy band diagram of the OPV device.

(a)

(b)

(c)

(d)