title: Evolution of the shape of the conducting channel in complementary resistive switching transition metal oxides.
abstract: Ultimate control of the defect distribution and local conduction path in a bipolar resistive switching (BRS) Pt/TiO2/Pt sample, which was in a unipolar reset state, is provided by means of voltage pulsing and the resulting time-transient current analysis. The limited amount of oxygen vacancies in this system allowed reversibly switching-diode-like current-voltage curves, which was also confirmed in another Magnéli-phase-containing Pt/WO3/Pt sample. Such careful control of the defect distribution allowed the achievement of a complementary resistive switching (CRS) curve even from a single switching layer. The unlimited vacancy source in the Pt/TiO2/TiO2-x/Pt sample did not allow the switching-diode type and the CRS behavior. The data retention of the on-state in the BRS was critically dependent on the shape of the rejuvenated conduction channel. The required time to lead to the rejuvenation of the conducting channel was ∼70-100 ns when the threshold voltage for the BRS set of ∼-1 V was applied.
authors.affiliation: Department of Materials Science and Engineering and Inter-university Semiconductor Research Center, Seoul National University, Seoul 151-744, Korea. cheolsh@snu.ac.kr.
authors.forename: Kyung Jean
authors.initials: KJ
authors.lastname: Yoon
authors.forename: Seul Ji
authors.initials: SJ
authors.lastname: Song
authors.forename: Jun Yeong
authors.initials: JY
authors.lastname: Seok
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Yoon
authors.forename: Tae Hyung
authors.initials: TH
authors.lastname: Park
authors.forename: Dae Eun
authors.initials: DE
authors.lastname: Kwon
authors.forename: Cheol Seong
authors.initials: CS
authors.lastname: Hwang
mesh_terms: D004553:Electric Conductivity; D010984:Platinum / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D010984:Platinum; D014025:Titanium; D014414:Tungsten