Enhancement in the performance of ultrathin hematite photoanode for water splitting by an oxide underlayer

Abstract

A 2-nm thick Nb 2O 5 underlayer deposited by atomic layer deposition increases the charge separation efficiency and the photovoltage of ultrathin hematite films by suppressing electron back injection. Absorbed photon-to-current efficiencies (APCE) as high as 40%, which are one of the highest ever reported with hematite photoanodes, are obtained at 400 nm at +1.43 V vs. RHE. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.