Au Nanoparticles as Template for Defect Formation in Memristive SrTiO3 Thin Films

Nanomaterials

Hongchu Du¹  Maximilian Kruth¹  Dirk Oliver Schmidt²  Ulrich Simon²  Regina Dittmann³  Nicolas Raab³ 

[1] Ernst Ruska-Center for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany;Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany;Peter Grünberg Institut 7 and JARA-FIT, Forschungszentrum Jülich, 52425 Jülich, Germany;

关键词: resistive switching;    memristive devices;    memristor;    SrTiO₃;    Au nanoparticles;   

DOI  :  10.3390/nano8110869

来源: DOAJ

【 摘 要 】

We investigated the possibility of tuning the local switching properties of memristive crystalline SrTiO ${}_3$ thin films by inserting nanoscale defect nucleation centers. For that purpose, we employed chemically-synthesized Au nanoparticles deposited on 0.5 wt%-Nb-doped SrTiO ${}_3$ single crystal substrates as a defect formation template for the subsequent growth of SrTiO ${}_3$ . We studied in detail the resulting microstructure and the local conducting and switching properties of the SrTiO ${}_3$ thin films. We revealed that the Au nanoparticles floated to the SrTiO ${}_3$ surface during growth, leaving behind a distorted thin film region in their vicinity. By employing conductive-tip atomic force microscopy, these distorted SrTiO ${}_3$ regions are identified as sites of preferential resistive switching. These findings can be attributed to the enhanced oxygen exchange reaction at the surface in these defective regions.

【 授权许可】

Unknown