title: Electrically tunable sign of capacitance in planar W-doped vanadium dioxide micro-switches.
abstract: Negative capacitance (NC) in a planar W-doped VO2micro-switch was observed at room temperature in the low-frequency range 1 kHz-10 MHz. The capacitance changed from positive to negative values as the W-doped VO2active layer switched from semiconducting to metallic state under applied voltage. In addition, a capacitance-voltage hysteresis was observed as the applied voltage was cycled from -35 to 35 V. These observations suggest that NC results from the increase of the electrically induced conductivity in the active layer. This NC phenomenon could be exploited in advanced multifunctional devices including ultrafast switches, field-effect transistors and memcapacitive systems.
authors.affiliation: INRS-Énergie, Matériaux et Télécommunications, 1650 Lionel Boulet, Varennes, QC, J3X 1S2, Canada.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Soltani
authors.affiliation: INRS-Énergie, Matériaux et Télécommunications, 1650 Lionel Boulet, Varennes, QC, J3X 1S2, Canada.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Chaker
authors.affiliation: Département de Physique, Université de Montréal, Montréal, QC, H3C 3J7, Canada.
authors.forename: Joelle
authors.initials: J
authors.lastname: Margot
keywords: negative capacitance; phase transition; switching; thermochromic; vanadium dioxide