although its third semicircle representing the Rdiff value is hardly distinguished, and the Rdiff value is not obtained by fitting. From the view point of Rdiff, it is quite reasonable that the cells based on the liquid electrolyte give a significantly higher average PCE (Fig. S2 and Table S2) than the gel electrolytes without IOS (Table 1), but the value is comparable to that of the gel electrolytes with IOS2.