t are sufficient for engendering ef

t are sufficient for engendering efficient charge separation, but which minimize Eloss (see section below on driving force and energy loss); absorb light of complementary wavelengths to those absorbed by the NFA to maximize light harvesting and the JSC; have high hole mobility (μh), comparable to the NFA μe, to help achieve high JSC and high fill factors; and exhibit phase separation on an appropriate scale and with appropriate molecular orientation to facilitate efficient charge separation and charge percolation pathways.