Publications de Wolfgang Amadeus Vitale

Tunable RF phase shifters based on Vanadium Dioxide metal insulator transition

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

2018

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

Mihai Adrian Ionescu, Igor Stolichnov, 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, Anna Krammer, Teodor Rosca, Josef Andreas Schuler, Cem Alper, Wolfgang Amadeus Vitale, Arnab Biswas, Emanuele Andrea Casu, 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, Michele Tamagnone, Wolfgang Amadeus Vitale, 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, Anna Krammer, Wolfgang Amadeus Vitale, 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, Mariazel de la Candelas Maqueda López, Anna Krammer, Josef Andreas Schuler, Montserrat Fernandez-Bolanos Badia, Michele Tamagnone, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, Nicolò Oliva

IEEE2017

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

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

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

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, Michele Tamagnone, Wolfgang Amadeus Vitale, Emanuele Andrea Casu, 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, Michele Tamagnone, Pankaj Sharma, Wolfgang Amadeus Vitale

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