Fig. 9

Unbiased two-electrode performance of TiO2|CsPbBr3|m-c|GS and TiO2|CsPbBr3|m-c|GS|WOC. a Chronoamperometric trace of TiO2|CsPbBr3|m-c|GS recorded in a two-electrode cell. b Chronoamperometric trace of TiO2|CsPbBr3|m-c|GS|WOC recorded in a two-electrode cell (0.1 M KNO3 with pH adjusted to 2.5 with H2SO4, with no external bias voltage applied)