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Normalized transient absorption decays of hematite photoholes probed at 700 nm and obtained with front-side low-intensity UV illumination (355 nm, 0.2 mJ/cm2, 0.33 Hz) of isolated hematite photoanodes, immersed in 0.1 M NaOH aqueous solution. Bare Fe2O3 films are shown in black, Fe2O3/CoOx is shown in blue, and Fe2O3/Ga2O3 is shown in green. Decay traces corresponding to APCVD hematite are depicted with full lines and to USP hematite with dashed lines.
