Tailoring the photocurrent in BaTiO3/Nb:SrTiO3 photoanodes by controlled ferroelectric polarization

Maxime Rioult 1 Sukanya Datta 1 D. Stanescu 1 S. Stanescu 2 R Belkhou 2 F. Maccherozzi 3 Hélène Magnan 1 Antoine Barbier 1
1 SPEC - UMR3680 - Service de physique de l'état condensé
2 SSOLEIL - Synchrotron SOLEIL
3 TASC - Laboratory TASC
Abstract : We demonstrate on prototypical samples containing a ferroelectric layer (BaTiO3/Nb:SrTiO3) that the efficiency of the system, used as photoanode, substantially depends on the polarization state of theferroelectric layer. We show a significant increase of the photocurrent by a factor larger than 2 when the BaTiO3 film is downward polarized. We explain this finding by the presence of an internal electric fieldwhich favors the separation of photo-generated charges
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Maxime Rioult, Sukanya Datta, D. Stanescu, S. Stanescu, R Belkhou, et al.. Tailoring the photocurrent in BaTiO3/Nb:SrTiO3 photoanodes by controlled ferroelectric polarization. Applied Physics Letters, American Institute of Physics, 2015, 107, pp.103901. ⟨10.1063/1.4930814⟩. ⟨cea-01349770⟩

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