Mobile ions may additionally screen the electric field; however, according to Figure 1 f, this screening is hardly significant under used short electrical pulses.
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Direct Tracking of Charge Carrier Drift and Extraction from Perovskite Solar Cells by Means of Transient Electroabsorption Spectroscopy.
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The sentences
The carrier transfer rate is, however, not important for the open circuit voltage when carrier extraction does not take place. It can also hardly significantly influence the short circuit current since then carrier density and recombination losses are insignificant. However, its influence on the fill factor and current at the maximal power point may be quite significant.