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Electrically tunable sign of capacitance in planar W-doped vanadium dioxide micro-switches

Author(s): Mohammed Soltani, Mohamed Chaker and Joelle Margot

Journal: Science and Technology of Advanced Materials
ISSN 1468-6996

Volume: 12;
Issue: 4;
Start page: 045002;
Date: 2011;
Original page

Negative capacitance (NC) in a planar W-doped VO2 micro-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 VO2 active 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.
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