Fig. 6: Electrochemical and photoelectrochemical characterization of perovskite QDs.

a Schematic CV profile of an irreversible redox system. Oxidation and reduction peaks correspond to the valence band maximum (HOMO) and conduction band minimum (LUMO), respectively. The energy difference between these peaks represents the quasiparticle bandgap of the QDs. Reproduced with permission from ref. ⁹⁰. Copyright 2022, Elsevier. b CV profiles of all-inorganic perovskite QDs (CsPb_1−x’Sn_x’X₃; X = I, Br). Variations in halogen atom stoichiometry result in distinct redox currents in the CV waveforms. c Quasiparticle bandgap energies of all-inorganic perovskite QDs derived from the CV method. b, c Reproduced with permission from ref. ⁸⁰. Published under an ACS AuthorChoice license. d Schematic representation of inefficient hole injection from a molecular probe superficially bound to CdSe-QDs, highlighting the need for precise interfacial engineering for proper band alignment to ensure efficient carrier injection or extraction. Reproduced with permission from ref. ⁹⁵. Copyright 2023, American Chemical Society. e Light-chopped photocurrent response of a CdS-sensitized NiO photocathode, with a maximum photocurrent of 0.13 mA cm⁻² at 0 V vs Ag/AgCl. f Light-chopped photocurrent response of a CdSe-sensitized TiO₂ photoanode, showing a peak photocurrent of 0.30 mA cm⁻² at 0 V vs Ag/AgCl. e, f Reproduced with permission from ref. ⁹⁹. Copyright 2014, American Chemical Society.