Fig. 2: Performance of PM6:D18:L8-BO organic IPV-anodes with 0.28 cm2 active area measured in a PEC cell.
a, Current density–voltage scans in the dark, under one sun continuous and chopped illumination for a high-performing PM6:D18:L8-BO IPV-anode. The scan rates were 20 mV s−1 for chopped illumination and 50 mV s−1 for the rest. The vertical dashed line at +1.23 VRHE indicates the standard oxidation potential of water to oxygen. b, The distribution of the onset potentials and photocurrent densities at +1.23 VRHE extracted from the current–voltage scans of seven organic IPV-anodes from different batches. The open diamond symbols show the values measured for the individual devices (lateral displacement is only for clarity), the solid squares are the mean values and the whiskers represent one standard deviation. c, The stabilized photocurrent density of a representative PM6:D18:L8-BO IPV-anode under 1 sun illumination without (0–30 s) and with (30–1,200 s) a 420 nm cut-off UV filter. d, The light-intensity-dependent open circuit voltage of the organic IPV-anode before and after deposition of the top graphite sheet. The open symbols represent the measured data points, while the solid lines show fitting by least squares regression. e, The IPCE spectra and integrated photocurrent density at +1.23 VRHE of a representative organic IPV-anode. f, The Faradaic efficiency of an organic IPV-anode calculated from the measured amount of generated O2 compared with the theoretical amount of O2 based on the recorded photocurrent. The green solid circles represent the Faradaic efficiency values, while the green solid line shows the same data smoothed with percentile filter method using points of window of 600. The measurements were performed in an aqueous 1 M NaOH electrolyte in a PEC cell.
