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Title

Control of the Polarization of Ferroelectric Capacitors by the Concurrent Action of Light and Adsorbates

AuthorsFanmao Liu; Fina, Ignasi ; Sauthier, Guillaume ; Sánchez Barrera, Florencio ; Rappe, Andrew M.; Fontcuberta, Josep
Keywordsadsorbates
barium titanate
depolarization field
ferroelectric
photocatalysis
photovoltaic
screening
water
Issue Date18-Jul-2018
PublisherAmerican Chemical Society
CitationACS Applied Materials and Interfaces 10(28): 23968-23975 (2018)
AbstractFerroelectric 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 BaTiO3 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 H2O-derived adsorbates at the buried metal−ferroelectric Pt/BaTiO3 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
Publisher version (URL)http://dx.doi.org/10.1021/acsami.8b05751
URIhttp://hdl.handle.net/10261/171681
ISSN1944-8244
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