title: Microstructure and dynamics of vacancy-induced nanofilamentary switching network in donor doped SrTiO3-xmemristors.
abstract: Donor doping of perovskite oxides has emerged as an attractive technique to create high performance and low energy non-volatile analog memories. Here, we examine the origins of improved switching performance and stable multi-state resistive switching in Nb-doped oxygen-deficient amorphous SrTiO3(Nb:a-STOx) metal-insulator-metal (MIM) devices. We probe the impact of substitutional dopants (i.e., Nb) in modulating the electronic structure and subsequent switching performance. Temperature stability and bias/time dependence of the switching behavior are used to ascertain the role of substitutional dopants and highlight their utility to modulate volatile and non-volatile behavior in a-STOxdevices for adaptive and neuromorphic applications. We utilized a combination of transmission electron microscopy, photoluminescence emission properties, interfacial compositional evaluation, and activation energy measurements to investigate the microstructure of the nanofilamentary network responsible for switching. These results provide important insights into understanding mechanisms that govern the performance of donor-doped perovskite oxide-based memristive devices.
authors.affiliation: Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, VIC 3001, Australia.
authors.forename: Hussein
authors.initials: H
authors.lastname: Nili
authors.forename: Taimur
authors.initials: T
authors.lastname: Ahmed
authors.forename: Sumeet
authors.initials: S
authors.lastname: Walia
authors.forename: Rajesh
authors.initials: R
authors.lastname: Ramanathan
authors.forename: Ahmad Esmaielzadeh
authors.initials: AE
authors.lastname: Kandjani
authors.forename: Sergey
authors.initials: S
authors.lastname: Rubanov
authors.forename: Jeeson
authors.initials: J
authors.lastname: Kim
authors.forename: Omid
authors.initials: O
authors.lastname: Kavehei
authors.forename: Vipul
authors.initials: V
authors.lastname: Bansal
authors.forename: Madhu
authors.initials: M
authors.lastname: Bhaskaran
authors.forename: Sharath
authors.initials: S
authors.lastname: Sriram