Tuning the Charge Carriers Migration in Epitaxial BaTiO3 Thin Film Photoanodes

Helene Magnan, Pierre-marie Deleuze, Julien Brehin, Thibault Plays, Dana Stanescu, Wendy R. Flavell, Mathieu G. Silly, Bruno Domenichini, Antoine Barbier

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We studied the growth of epitaxial ferroelectric layers BaTiO3/Pt(001) in the framework of solar water splitting. The stoichiometry, i.e. the Ti/Ba ratio, appears as a crucial parameter not only for the crystallographic structure but also for the photocurrent generation when the sample is used as photoanode. We established an electrochemical poling method using a modulated potential, without altering the sample to control the electric polarization. Importantly, we show that the photoanode efficiency is improved when the polarization of the film is oriented towards the substrate. We demonstrate that this improvement is only due to the electrical field created by screening charges, which allows the separation of photo-generated charges.
Original languageEnglish
JournalThe Journal of Physical Chemistry C
Early online date17 Apr 2020
Publication statusE-pub ahead of print - 17 Apr 2020


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