Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 28, Pages 23968-23975Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b05751
Keywords
ferroelectric; photovoltaic; water; adsorbates; photocatalysis; barium titanate; screening; depolarization field
Funding
- Spanish government (AEI/FEDER,UE) [MAT2014-56063-C2-1-R, MAT2017-85232-R]
- Spanish government [MAT2015-73839-JIN]
- Spanish government (associated FEDER)
- Catalan government [2017 SGR 1377]
- Spanish Ministry of Economy and Competitiveness through Severo Ochoa Programme for Centres of Excellence in RD [SEV-2015-0496]
- Juan de la Cierva-Incorporacion postdoctoral fellowship from Spanish Ministry of Economy and Competitiveness [IJCI-2014-19102]
- China Scholarship Council (CSC) [201306020016]
- Office of Naval Research [N00014-17-1-2574]
- CERCA programme/ Generalitat de Catalunya
- Severo Ochoa programme of the Spanish Ministry of Economy, Industry and Competitiveness (MINECO) [SEV-2013-0295]
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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 photo dissociated 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 H(2)o-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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