Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 213, Issue 4, Pages 1082-1087Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201532636
Keywords
BST thin films; ferroelectric properties; light-controlled resistive switching; Schottky barrier modulation
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In this work, Ba0.8Sr0.2TiO3 (BST)/ITO structures were grown on glass substrate and laser assisted annealing (LAA) was performed to promote the crystallization of BST. Atomic force microscopy and X-ray diffraction studies confirm the crack free and polycrystalline perovskite phase of BST. White light controlled resistive switching (RS) effect in Au/BST/ITO device is investigated. The device displays the electroforming-free bipolar RS characteristics and are explained by the modulation of the width and height of barrier at the BST/ITO interface via ferroelectric polarization. Moreover, the RS effect is significantly improved under white light illumination compared to that in the dark. The enhanced RS and photovoltaic effects are explained by considering depolarization field and charge distribution at the interface. The devices exhibit stable retention characteristics with low currents (A), which make them attractive for non volatile memory devices.
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