316045.fig.004a
(a)
316045.fig.004b
(b)
Figure 4: (a) J-V curves of OPVs based on the RR-P3HT/PCBM and F8T2/PC70BM blend films. (b) IPCE spectra for OPVs based on the RR-P3HT/PCBM and F8T2/PC70BM blend films.