An electrochemical deposition route for obtaining α- Fe 2O3 thin films: II. EQCM study and semiconductor properties

Ricardo Schrebler, Cynthia Llewelyn, Francisca Vera, Paula Cury, EDUARDO CARLO MUÑOZ CARTAGENA, Rodrigo Del Río, Humberto Gómez Meier, Ricardo Córdova, Enrique A. Dalchiele

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44 Scopus citations

Abstract

The electrochemical formation of hematite (α- Fe2 O3) precursor thin films (oxyhydroxide iron compounds), onto gold substrates in an aqueous solution of Fe(III)+KF+ H2 O2 was investigated in situ using an electrochemical quartz crystal microbalance (EQCM) and voltammetric techniques. Nanostructured α- Fe2 O3 obtained after annealing of oxyhydroxide iron compounds thin films have been prepared onto SnO2 F covered glass substrates through a potential cycling procedure in this electrolytic bath. Photoelectrochemical measurements, carried out in 0.1 M NaOH+0.05 M KI electrolyte at pH 13, show an n-type behavior, a flatband potential of -1.08 V vs saturated mercury/mercury sulfate reference electrode, and an apparent donor density of 1.26× 1019 cm-3 at 1 kHz.

Original languageEnglish
Pages (from-to)D95-D99
JournalElectrochemical and Solid-State Letters
Volume10
Issue number10
DOIs
StatePublished - 2007
Externally publishedYes

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