Control of the polarization of ferroelectric capacitors by the concurrent action of light and adsorbates
Liu, Fanmao (Institut de Ciència de Materials de Barcelona)
Fina, Ignasi (Institut de Ciència de Materials de Barcelona)
Sauthier, Guillaume (Institut Català de Nanociència i Nanotecnologia)
Sánchez Barrera, Florencio (Institut de Ciència de Materials de Barcelona)
Rappe, Andrew M. (University of Pennsylvania. Department of Chemistry)
Fontcuberta, Josep (Institut de Ciència de Materials de Barcelona)

Data:	2018
Resum:	Ferroelectric perovskites hold promise of enhanced photovoltaic efficiency and photocatalytic activity. Consequently, the photoresponse of oxide ferroelectric thin films is an active field of research. In electrode/ferroelectric/electrode devices, internal charge in the ferroelectric, free charge in the electrodes, and buried adsorbates at interfaces combine to screen the ferroelectric polarization and to stabilize the polar state. Under illumination, photoinduced carriers and photodissociated adsorbates may disrupt the screening equilibrium, modifying the switchable polarization and altering its expected benefits. Here, we explore the photoresponse of BaTiO thin films in a capacitor geometry, focusing on the effects of visible illumination on the remanent polarization. By combining ferroelectric and X-ray photoelectron spectroscopy, we discover that photoreaction of charge-screening HO-derived adsorbates at the buried metal-ferroelectric Pt/BaTiO interface plays an unexpected pivotal role, enabling a substantial modulation (up to 75%) of the switchable remanent polarization by light. These findings illustrate that the synergy between photochemistry and photovoltaic activity at the surface of a ferroelectric material can be exploited to tune photoferroelectric activity.
Ajuts:	Ministerio de Economía y Competitividad MAT2017-85232-R Ministerio de Economía y Competitividad SEV-2015-0496 Ministerio de Economía y Competitividad MAT2015-73839-JIN Ministerio de Economía y Competitividad MAT2014-56063-C2-1-R Ministerio de Economía y Competitividad IJCI-2014-19102 Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-734
Nota:	Altres ajuts: the ICN2 is funded by the CERCA programme/ Generalitat de Catalunya.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Ferroelectric ; Photovoltaic ; Water ; Adsorbates ; Photocatalysis ; Barium titanate ; Screening ; Depolarization field
Publicat a:	ACS applied materials & interfaces, Vol. 10, issue 28 (July 2018) , p. 23968-23975, ISSN 1944-8252

DOI: 10.1021/acsami.8b05751

Postprint 25 p, 1.2 MB

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