Publications de Wolfgang Amadeus Vitale

Tunable RF phase shifters based on Vanadium Dioxide metal insulator transition

Mihai Adrian Ionescu, Josef Andreas Schuler, Montserrat Fernandez-Bolanos Badia, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, Nicolò Oliva, Anna Krammer, Alessandro Fumarola, Matteo Cavalieri, Andrei Müller

2018

Polarity Control of Top Gated Black Phosphorous FETs by Workfunction Engineering of Pre-Patterned Au and Ag Embedded Electrodes

Igor Stolichnov, Mihai Adrian Ionescu, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, Nicolò Oliva

We propose and experimentally demonstrate top-gated complementary n- and p-type black phosphorous field effect devices (FETs) by engineering the workfunction of pre-patterned electrodes embedded in a SiO2 bottom layer. Pre-patterned electrodes offer the ad ...

2018

A Steep-Slope Transistor Combining Phase-Change and Band-to-Band-Tunneling to Achieve a sub-Unity Body Factor

Mihai Adrian Ionescu, Josef Andreas Schuler, Wolfgang Amadeus Vitale, Arnab Biswas, Cem Alper, Emanuele Andrea Casu, Teodor Rosca, Anna Krammer, Qun Zhao

Steep-slope transistors allow to scale down the supply voltage and the energy per computed bit of information as compared to conventional field-effect transistors (FETs), due to their sub-60 mV/decade subthreshold swing at room temperature. Currently pursu ...

Nature Research2017

Modulated scattering technique in the terahertz domain enabled by current actuated vanadium dioxide switches

Juan Ramon Mosig, Anja Skrivervik, Mihai Adrian Ionescu, Wolfgang Amadeus Vitale, Michele Tamagnone, Santiago Capdevila Cascante

The modulated scattering technique is based on the use of reconfigurable electromagnetic scatterers, structures able to scatter and modulate an impinging electromagnetic field in function of a control signal. The modulated scattering technique is used in a ...

Nature Research2017

Elevated transition temperature in Ge doped VO2 thin films

Mihai Adrian Ionescu, Andreas Schueler, Arnaud Magrez, Wolfgang Amadeus Vitale, Anna Krammer, Piotr Mocny

Thermochromic GexV1-xO2+y thin films have been deposited on Si (100) substrates by means of reactive magnetron sputtering. The films were then characterized by Rutherford backscattering spectrometry (RBS), four-point probe electrical resistivity measuremen ...

2017

Shunt capacitive switches based on VO2 metal insulator transition for RF phase shifter applications

Mihai Adrian Ionescu, Andreas Schueler, Josef Andreas Schuler, Montserrat Fernandez-Bolanos Badia, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, Mariazel de la Candelas Maqueda López, Michele Tamagnone, Nicolò Oliva, Anna Krammer

IEEE2017

Graphene quantum capacitors for high-Q tunable LC-tanks for RF ICs

Juan Ramon Mosig, Mihai Adrian Ionescu, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale, Michele Tamagnone

We propose and characterize graphene quantum capacitors, tunable with voltage by the control of their charge density, for tunable LC tanks as essential building blocks for Radio-Frequency (RF) functions in densely integrated circuits. We fabricate and inve ...

IEEE2016

Hybrid phase-change — Tunnel FET (PC-TFET) switch with subthreshold swing < 10mV/decade and sub-0.1 body factor: Digital and analog benchmarking

Mihai Adrian Ionescu, Josef Andreas Schuler, Wolfgang Amadeus Vitale, Arnab Biswas, Cem Alper, Emanuele Andrea Casu, Teodor Rosca, Nicolò Oliva, Anna Krammer

In this paper we report the first hybrid Phase-Change - Tunnel FET (PC-TFET) device configurations for achieving a deep sub-thermionic steep subthreshold swing at room temperature and subthreshold power savings. The proposed hybrid device feedbacks the ste ...

IEEE2016

Field-enhanced design of steep-slope VO2 switches for low actuation voltage

Juan Ramon Mosig, Mihai Adrian Ionescu, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, Michele Tamagnone, Luca Petit

The abrupt metal-insulator transition in vanadium dioxide (VO2) offers novel performance and functionality for beyond CMOS switches, enabling simultaneous high ON current and ultra-steep subthreshold slope with low temperature dependence. We developed a fi ...

IEEE2016

Graphene Quantum Capacitors for High Frequency Tunable Analog Applications

Juan Ramon Mosig, Mihai Adrian Ionescu, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale, Pankaj Sharma, Michele Tamagnone

Graphene quantum capacitors (GQC) are demonstrated to be enablers of radio-frequency (RF) functions through voltage-tuning of their capacitance. We show that GQC complements MEMS and MOSFETs in terms of performance for high frequency analog applications an ...

American Chemical Society (ACS)2016

Reconfigurable electronics based on metal-insulator transition : steep-slope switches and high frequency functions enabled by Vanadium Dioxide

Wolfgang Amadeus Vitale

The vast majority of disruptive innovations in science and technology has been originated from the discovery of a new material or the way its properties have been exploited to create novel devices and systems. New advanced nanomaterials will have a lasting ...

EPFL2016

Electrothermal actuation of vanadium dioxide for tunable capacitors and microwave filters with integrated microheaters

Mihai Adrian Ionescu, Andreas Schueler, Montserrat Fernandez-Bolanos Badia, Antonio Paone, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale, Luca Petit

We report the fabrication, modeling and characterization of novel microwave tunable capacitors based on the metal-insulator transition (MIT) of Vanadium Dioxide (VO2) as a future replacement solution for microelectromechanical capacitive switches. We prese ...

Elsevier Science Sa2016

Investigation of the metal-insulator transition in VO2 for Electronic Switches with Sub-1mV/Decade Steep Subthreshold Slope

Mihai Adrian Ionescu, Andreas Schueler, Josef Andreas Schuler, Antonio Paone, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale

We report a thorough investigation of the electrically-induced metal-insulator transition in vanadium dioxide (VO2) for abrupt switching in 2-terminal devices (0.24 mV/dec at 25 °C, 0.38 mV/dec at 50 °C). We exploit the electrothermal actuation model based ...

IEEE2016

Solid-gap wine-glass mode disks VB-FET resonators applied to biomass sensing

Mihai Adrian Ionescu, Montserrat Fernandez-Bolanos Badia, Wolfgang Amadeus Vitale, Mariazel de la Candelas Maqueda López

The working principle of an electromechanical resonator for mass sensing applications is based on monitoring the characteristic resonance frequency downshift due to the particles attachment on the surface of the device. Solid-Gap Vibrating-Body Field Effec ...

Elsevier Science Bv2015

Fabrication process and characterization of suspended graphene membranes for RF NEMS capacitive switches

Mihai Adrian Ionescu, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale, Laurent Syavoch Bernard, Pankaj Sharma

The fabrication of a Nanoelectromechanical System (NEMS) capacitive switch consisting of a suspended multilayer graphene membrane, doubly clamped on a coplanar waveguide (CPW) is presented and its RF performance is evaluated. The scattering parameters are ...

Elsevier2015

Graphene RF NEMS shunt switches for analog and digital phase shifters

Mihai Adrian Ionescu, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale, Michele Tamagnone

2015

Fabrication of CMOS-compatible abrupt electronic switches based on vanadium dioxide

Mihai Adrian Ionescu, Josef Andreas Schuler, Antonio Paone, Clara-Fausta Moldovan, Wolfgang Amadeus Vitale

Vanadium dioxide thin films were deposited on amorphous SiO2-coated Si substrates, by reactive magnetron sputtering at 490 °C of a pure vanadium target. The deposition parameters were optimized in order to maximize the resistivity modulation due to the met ...

Elsevier2015

Wolfgang Amadeus Vitale

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Tunable RF phase shifters based on Vanadium Dioxide metal insulator transition

Polarity Control of Top Gated Black Phosphorous FETs by Workfunction Engineering of Pre-Patterned Au and Ag Embedded Electrodes

A Steep-Slope Transistor Combining Phase-Change and Band-to-Band-Tunneling to Achieve a sub-Unity Body Factor

Modulated scattering technique in the terahertz domain enabled by current actuated vanadium dioxide switches

Elevated transition temperature in Ge doped VO2 thin films

Shunt capacitive switches based on VO2 metal insulator transition for RF phase shifter applications

Graphene quantum capacitors for high-Q tunable LC-tanks for RF ICs

Hybrid phase-change — Tunnel FET (PC-TFET) switch with subthreshold swing < 10mV/decade and sub-0.1 body factor: Digital and analog benchmarking

Field-enhanced design of steep-slope VO2 switches for low actuation voltage

Graphene Quantum Capacitors for High Frequency Tunable Analog Applications

Reconfigurable electronics based on metal-insulator transition : steep-slope switches and high frequency functions enabled by Vanadium Dioxide

Electrothermal actuation of vanadium dioxide for tunable capacitors and microwave filters with integrated microheaters

Investigation of the metal-insulator transition in VO2 for Electronic Switches with Sub-1mV/Decade Steep Subthreshold Slope

Solid-gap wine-glass mode disks VB-FET resonators applied to biomass sensing

Fabrication process and characterization of suspended graphene membranes for RF NEMS capacitive switches

Graphene RF NEMS shunt switches for analog and digital phase shifters

Fabrication of CMOS-compatible abrupt electronic switches based on vanadium dioxide

CMOS-compatible abrupt switches based on VO2 metal-insulator transition

Performance evaluation of novel technologies for terahertz reflectarrays

Spatial Variability in Large Area Single and Few-layer CVD Graphene