am8b05751_si_001.pdf (2.67 MB)
Control of the Polarization of Ferroelectric Capacitors by the Concurrent Action of Light and Adsorbates
journal contribution
posted on 2018-06-18, 00:00 authored by Fanmao Liu, Ignasi Fina, Guillaume Sauthier, Florencio Sánchez, Andrew M. Rappe, Josep FontcubertaFerroelectric 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.
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capacitor geometryswitchable remanent polarizationphotoinduced carrierstune photoferroelectric activityilluminationswitchable polarizationelectrodefilmcharge-screening H 2 O-derived adsorbatesphotoresponseAdsorbates Ferroelectric perovskitesFerroelectric Capacitorsphotovoltaic activityremanent polarizationX-ray photoelectron spectroscopyphotovoltaic efficiencyBaTiO 3photocatalytic activityphotodissociated adsorbatesscreening equilibriumConcurrent Actioninterface
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