Fig. 8.

I-V profiles generated under constant light exposure (a) and against storage time in dark glass bottles (b) over a period of 48 hrs. To increase statistical significance, the experiments were repeated three times for each measurement per day before the average profile was plotted. The experiments were also further repeated the next week to confirm the trend (see Supplementary Figs. S4 and S5 online). Error bars were similar to those obtained in Fig. 2 denoting high repeatability.