• Hole and electron mobilities were often not reported or reported inconsistently. HOD or EOD mobilities were recorded only if measured for the blend, and not for single material devices • Reports of charge extraction by linearly increasing voltage (CELIV) measurements for the "faster carrier" were excluded as this did not specify whether hole or electron mobility were recorded. • From each set of parameters of VOC, JSC, FF, we calculated the PCE with the formula PCE = VOC x JSC x FF. When comparing these with reported values within the dataset, we looked for errors > 1% of the PCE values. In these cases, we compared the values in the dataset and those in the relevant paper. We often found that values had simply been misreported. The most common errors were: (i) inconsistent reporting of FF as either a percentage or a fraction (i.e. a 100-fold discrepancy in FF), (ii) values reported for a different device, or (iii) reported PCE had rounding errors. Because of these discrepancies, we chose to use our calculated PCE instead of the reported PCE values.