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 the ferroelectric 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 field which favors the separation of photo-generated charges.
Tailoring the photocurrent in BaTiO3/Nb:SrTiO3 photoanodes by controlled ferroelectric polarization
M. Rioult, S. Datta, D. Stanescu, S. Stanescu, R. Belkhou, F. Maccherozzi, H. Magnan, A. Barbier; Tailoring the photocurrent in BaTiO3/Nb:SrTiO3 photoanodes by controlled ferroelectric polarization. Appl. Phys. Lett. 7 September 2015; 107 (10): 103901. https://doi.org/10.1063/1.4930814
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