Publications de Luca De Michielis

Semiconductor tunneling device

Mihai Adrian Ionescu, Luca De Michielis, Nilay Dagtekin, Livio Lattanzio, Cem Alper

The present invention concerns a semiconductor tunneling Field-Effect device including a source, a drain, at least one elongated semiconductor structure extending in an elongated direction, a first gate, and a second gate. The first gate has a length exten ...

2016

Compact modeling of DG-Tunnel FET for Verilog-A implementation

Mihai Adrian Ionescu, Luca De Michielis, Arnab Biswas, Antonios Bazigos

In this work, a compact model based on an analytical closed form solution of the 1D Poisson's equation for a double-gate Tunnel FET is derived. Furthermore, the current levels are estimated by implementing an algorithm based on the Kane's band-to-band tunn ...

IEEE2015

Conformal Mapping Based DC Current Model For Double Gate Tunnel FETs

Mihai Adrian Ionescu, Luca De Michielis, Arnab Biswas, Cem Alper

In this work, the conformal mapping technique is applied to obtain an analytical closed form solution of the 2D Poisson’s equation for a double-gate Tunnel FET. The generated band profiles are accurate in all regions of device operation. Furthermore, the c ...

IEEE2014

Compact Modeling of Homojunction Tunnel FETs

Mihai Adrian Ionescu, Wladyslaw Grabinski, Luca De Michielis, Nilay Dagtekin, Arnab Biswas, Antonios Bazigos, Cem Alper

Aggressive scaling of the supply voltage reduces the energy needed for switching of standard CMOS devices. However, advanced CMOS technologies are facing two main problems that consequently lead to higher power consumption: the complexity of a further supp ...

IEEE2014

Quantum Mechanical Study of the Germanium Electron-Hole Bilayer Tunnel FET

Mihai Adrian Ionescu, Luca De Michielis, Livio Lattanzio, Luca Selmi, Cem Alper, Pierpaolo Palestri

The electron-hole bilayer tunnel field-effect transistor (EHBTFET) is an electronic switch that uses 2-D-2-D sub-band-to-sub-band tunneling (BTBT) between electron and hole inversion layers and shows significant subthermal swing over several decades of cur ...

Ieee-Inst Electrical Electronics Engineers Inc2013

Tunneling and Occupancy Probabilities: How Do They Affect Tunnel-FET Behavior?

Mihai Adrian Ionescu, Kirsten Emilie Moselund, Luca De Michielis, Livio Lattanzio, Heike Riel

In this letter, the occupancy and tunneling probabilities of interband tunneling devices are studied, pointing out the fundamental function of the source Fermi-Dirac distribution. Particularly, the reason for the degraded subthreshold swing, which is typic ...

Institute of Electrical and Electronics Engineers2013

An innovative band-to-band tunneling analytical model and implications in compact modeling of tunneling-based devices

Mihai Adrian Ionescu, Luca De Michielis, Nilay Dagtekin, Livio Lattanzio, Luca Selmi, Arnab Biswas, Heike Riel

In this paper, an analytical band-to-band tunneling model is proposed, validated by means of drift-diffusion simulation and comparison with experimental data, implemented in Verilog-A, and finally proven with SPICE simulator through simulation of circuits ...

American Institute of Physics2013

New Tunnel-FET Architecture with Enhanced Ion and Improved Miller Effect for Energy Efficient Switching

Mihai Adrian Ionescu, Luca De Michielis, Arnab Biswas, Cem Alper

Tunneling Field Effect Transistors (TFET) are promising devices to respond to the demanding requirements of future technology nodes. The benefits of the TFETs are linked to their sub-60mV/decade sub-threshold swing, a prerequisite for scaling the supply vo ...

2012

On the Static and Dynamic Behavior of the Germanium Electron-Hole Bilayer Tunnel FET

Mihai Adrian Ionescu, Luca De Michielis, Nilay Dagtekin, Livio Lattanzio

Tunnel FETs (TFETs) are being intensively investigated for their potential in achieving subthermal switching slopes and extremely low leakage currents. Recently, a promising concept has been proposed: the electron-hole bilayer TFET (EHBTFET), which exploit ...

Ieee-Inst Electrical Electronics Engineers Inc2012

Tunnel FET with non-uniform gate capacitance for improved device and circuit level performance

Mihai Adrian Ionescu, Luca De Michielis, Nilay Dagtekin, Livio Lattanzio, Cem Alper

IEEE2012

The electron–hole bilayer tunnel FET

Mihai Adrian Ionescu, Luca De Michielis, Livio Lattanzio

We propose a novel tunnel field-effect transistor (TFET) concept called the electron–hole bilayer TFET (EHBTFET). This device exploits the carrier tunneling through a bias-induced electron–hole bilayer in order to achieve improved switching and higher driv ...

Elsevier2012

Understanding the Superlinear Onset of Tunnel-FET Output Characteristic

Mihai Adrian Ionescu, Luca De Michielis, Livio Lattanzio

In this letter, we report that the source and channel Fermi-Dirac distributions in interband-tunneling-controlled transistors play a fundamental role on the modulation of the injected current. We explain the superlinear onset of the output characteristics ...

Institute of Electrical and Electronics Engineers2012

Complementary Germanium Electron-Hole Bilayer Tunnel FET for Sub-0.5-V Operation

Mihai Adrian Ionescu, Luca De Michielis, Livio Lattanzio

In this paper we present a novel device, the Germanium Electron-Hole Bilayer Tunnel FET (Ge EHBTFET), which exploits carrier tunneling through a bias-induced electron-hole bilayer. The proposed architecture provides a quasi-ideal alignment between the tunn ...

Institute of Electrical and Electronics Engineers2012

Beyond Scaling : Physics and Modeling for Pushing the Frontiers of Low-Power Devices

Luca De Michielis

Over the recent decades, the balance between increasing the complexity of computer chips and simultaneously reducing cost per bit has been accommodated by down-scaling. While extremely successful in the past, this approach now faces grave limitations leadi ...

EPFL2012

Effect of the choice of the tunnelling path on semi-classical numerical simulations of TFET devices

Mihai Adrian Ionescu, Luca De Michielis, Luca Selmi, Pierpaolo Palestri

In this work a non-local band-to-band tunnelling model has been successfully implemented into a fullband Monte Carlo simulator and applied to Tunnel-FET devices. No stability or statistical noise problems were encountered in spite of particle weights rangi ...

Elsevier2011

Tunneling path impact on semi-classical numerical simulations of TFET devices

Mihai Adrian Ionescu, Luca De Michielis, Luca Selmi, Pierpaolo Palestri

In this work a non-local band-to-band tunnelling model has been implemented into a full-band Monte Carlo simulator. Two different approaches for the choice of the tunnelling path have been implemented and their impact on the transfer characteristics of dif ...

IEEE2011

Tunnel-FET architecture with improved performance due to enhanced gate modulation of the tunneling barrier

Mihai Adrian Ionescu, Luca De Michielis, Livio Lattanzio, Luca Selmi, Pierpaolo Palestri

The Tunnel-FET (TFET) device is a gated reverse biased p-i-n junction whose working principle is based on the quantum mechanical Band-to-Band Tunneling (B2BT) mechanism [1]. The OFF-ON transition can be much more abrupt than for conventional MOSFETs, thus ...

IEEE2011

Ultra low power: Emerging devices and their benefits for integrated circuits

Mihai Adrian Ionescu, Giovanni Antonio Salvatore, Luca De Michielis, Alexandru Rusu, Nilay Dagtekin, Ji Cao, Sebastian Thimotee Bartsch

In this paper we analyze and discuss the characteristics and expected benefits of some emerging device categories for ultra low power integrated circuits. First, we focus on two categories of sub-thermal subthreshold swing switches Tunnel FETs and Negative ...

IEEE2011

Electron-hole bilayer tunnel FET for steep subthreshold swing and improved ON current

Mihai Adrian Ionescu, Luca De Michielis, Livio Lattanzio

We propose a novel Tunnel field-effect transistor (TFET) concept called the electron-hole bilayer TFET (EHBTFET). This device exploits the carrier tunneling through a bias-induced electron-hole bilayer in order to achieve improved switching and higher driv ...

IEEE2011

Corner Effect and Local Volume Inversion in SiNW FETs

Mihai Adrian Ionescu, Kirsten Emilie Moselund, Luca De Michielis, Luca Selmi

In this paper, a quantitative study of the corner effect and of the local volume inversion on gate-all-around MOSFETs based on numerical simulations has been carried out; different angles and doping levels are compared, in order to understand the impact of ...

Institute of Electrical and Electronics Engineers2011