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- Title
Formation and Movement of Cationic Defects During Forming and Resistive Switching in SrTiO<sub>3</sub> Thin Film Devices.
- Authors
Lenser, Christian; Koehl, Annemarie; Slipukhina, Ivetta; Du, Hongchu; Patt, Marten; Feyer, Vitaliy; Schneider, Claus M.; Lezaic, Marjana; Waser, Rainer; Dittmann, Regina
- Abstract
The resistance switching phenomenon in many transition metal oxides is described by ion motion leading to the formation of oxygen-deficient, highly electron-doped filaments. In this paper, the interface and subinterface region of electroformed and switched metal-insulator-metal structures fabricated from a thin Fe-doped SrTiO3 (STO) film on n-conducting Nb-doped SrTiO3 crystals are investigated by photoemission electron microscopy, transmission electron microscopy, and hard X-ray photoelectron spectroscopy in order to gain a deeper understanding of cation movement in this specific system. During electroforming, the segregation of Sr to the top interface and the generation of defect-rich cones in the film are observed, apparently growing from the anode toward the cathode during electroforming. An unusual binding energy component of the Sr 3d emission line is observed which can be assigned to
- Subjects
CATIONS; THIN films; STRONTIUM compounds; TITANIUM oxides; TRANSITION metal oxides; TRANSMISSION electron microscopy; DOPING agents (Chemistry)
- Publication
Advanced Functional Materials, 2015, Vol 25, Issue 40, p6360
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201500851