Efficiency and lifetime data from a series of PCBM:P3HT:dye devices. We plot: (top) the initial power conversion efficiency η; and (bottom) the decay time constant τ as a function of dye weight percent with respect to PCBM. The small symbols refer to each sample measured and the large circles show the average value for each dye concentration. Black symbols represent samples without dye whereas the red and green symbols refer to red (DR1) and green (1) dyes respectively.