title: Proton intercalated two-dimensional WO3 nano-flakes with enhanced charge-carrier mobility at room temperature.
abstract: Quasi two-dimensional (Q2D) semiconducting metal oxides with enhanced charge carrier mobility hold tremendous promise for nano-electronics, photonics, catalysis, nano-sensors and electrochromic applications. In addition to graphene and metal dichalcogenides MX2 (M = Mo, W; X = S, Se, Te), 2D sub-stoichiometric WO(3-x) is gaining importance as a promising semiconductor material for field-effect-transistor (FET) based devices. A combination of high permittivity, suppression of the Coulomb effects, and their stratified structure enhances the carrier mobility in such a material. Additionally, the sub-stoichiometry of this semiconductor oxide allows the reduction of the bandgap and increase of the free charge carriers at the same time. Here, we report for the first time H(+) intercalated WO(3) FETs, made of Q2D nano-flakes, with enhanced charge-carrier mobility exceeding 319 cm(2) V(-1) s(-1) comparable with the charge-carrier mobility of Q2D dichalcogenides MoS(2) and WSe(2). Analyses indicate that the enhanced electrical properties of the sub-stoichiometric WO(3-x) depend on the oxygen vacancies in the intercalated nano-flakes. These findings confirmed that Q2D sub-stoichiometric WO(3-x) is a promising material for various functional FET devices.
authors.affiliation: CSIRO, Materials Science and Engineering Division, 37 Graham Road, Highett, VIC 3190, Australia. serge.zhuiykov@csiro.au.
authors.forename: Serge
authors.initials: S
authors.lastname: Zhuiykov
authors.forename: Eugene
authors.initials: E
authors.lastname: Kats
authors.forename: Benjamin
authors.initials: B
authors.lastname: Carey
authors.forename: Sivacarendran
authors.initials: S
authors.lastname: Balendhran