title: Enhancement in the performance of ultrathin hematite photoanode for water splitting by an oxide underlayer.
abstract: A 2-nm thick Nb(2)O(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.
authors.affiliation: Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Switzerland.
authors.forename: Takashi
authors.initials: T
authors.lastname: Hisatomi
authors.forename: Hen
authors.initials: H
authors.lastname: Dotan
authors.forename: Morgan
authors.initials: M
authors.lastname: Stefik
authors.forename: Kevin
authors.initials: K
authors.lastname: Sivula
authors.forename: Avner
authors.initials: A
authors.lastname: Rothschild
authors.forename: Michaël
authors.initials: M
authors.lastname: Grätzel
authors.forename: Nripan
authors.initials: N
authors.lastname: Mathews
mesh_terms: D004566:Electrodes; D005290:Ferric Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D009556:Niobium / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D055668:Photochemical Processes; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D010087:Oxides; D009556:Niobium; D014867:Water; C009495:titanium dioxide; C000499:ferric oxide; D006861:Hydrogen Peroxide; D014025:Titanium; C073337:niobium pentoxide