Abstract
A facile strategy was found to passivate surface states on the undoped hematite photoanode by scanning the photocurrent-time curves in saturated NaCl aqueous electrolyte. Incident photon to current efficiency (IPCE) of the hematite photoanode was increased by a factor of 2.6 (from 5% to 13%) at 365nm and 1.23 VRHE (reversible hydrogen electrode) after this pretreatment. This enhancement was ascribed to the surface states passivation, which diminishes the recombination centers of the photogenerated carriers. The surface states passivation was confirmed by current transients and photoluminescence (PL) spectra.
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