SrTiO3 (STO) single crystal wafer was annealed in vacuum, and co-planar metal–insulator–metal structure of Pt/Ti/STO/Ti/Pt were formed by sputtering Pt/Ti electrodes onto the surface of STO after annealing. The forming-free resistive switching behavior with self-compliance property was observed in the sample. The sample showed switchable diode effect, which is explained by a simple model that redistribution of oxygen vacancies (OVs) under the external electric field results in the formation of n–n+ junction or n+–n junction (n donated n-type semiconductor; n+ donated heavily doped n-type semiconductor). The self-compliance property is also interpreted by the formation of n–n+/n+–n junction caused by the migration of the OVs under the electric field.
Applied Physics A: Materials Science Processing – Springer Journals
Published: Aug 8, 2017
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