Michele ESPOSTO

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Ph.D. candidate

Course: Electronics and Telecommunications


Brief CV:

Michele Esposto was born in Monte Sant'Angelo (FG), Italy, on June 28th, 1983.

He received the Bachelor of Science in Electronic Engineering, from the University of Modena and Reggio Emilia in 2005, discussing a thesis entitled "Progetto e sviluppo di un sistema di rivelazione diretta di raggi X privo di scintillatore" - Prof. Luigi Rovati, Prof. Giovanni Verzellesi. Still from the University of Modena and Reggio Emilia, in 2007 he received the Master of Science in Electronic Engineering, discussing a thesis entitled "Realizzazione di un sistema Current-DLTS per dispositivi HEMT a semiconduttori composti" - Prof. Alessandro Chini.

From January 2008 he is a Ph.D. candidate of the Internation Doctorate School in ICT, University of Modena and Reggio Emilia. His research field is Electronic Devices, project: "Characterization and Reliability of GaN HEMTs (High Electron Mobilty Transistors) for High Power and High Temperature Applications" - Prof. Alessandro Chini.


Research activity:

My activity is focused on the fabrication and RF-characterization of AlGaN/GaN High Electron Mobility Transistors for high power and high temperature microwave applications. The fabrication is carried out at the facilities of the N.N.L. (National Nanotechnology Laboratory) – part of CNR-INFM in Lecce where I spent a non-continuous period of about 6 months. In that clean-room I’ve acquired skills in contact photo-litography, metal deposition, dry and wet etching processes. I’ve fabricated standard HEMT devices on sapphire substrate yielding a 3 W/mm output power density without significant dispersion phenomena. The RF-characterization of the fabricated devices is carried out at the DII Department of Modena, by means of DC and pulsed IV measurement, Current-DLTS (Deep Level Transient Spectroscopy) for the current-collapse analysis, and a 2GHz Continuous Wave Load-Pull system for the evaluation of RF power performances. For the next future I will work on the processing optimization and standardization.

My work is supported by the MiUR under the FIRB 2007-2010: "Enabling technologies, characterisation and modelling for wideband reconfigurable integrated electronic components for high frequency applications". Coord. Scientifico: prof. LIMITI Ernesto, Resp. Scientifico: prof. CHINI Alessandro.


List of publications:

International Workshops and Conference Presentations:

1) A. Chini, M. Esposto, G. Verzellesi, S. Lavanga, C. Lanzieri, A. Cetronio, "Characterization and Numerical Simulations of High Power Field-Plated pHEMTs", European Microwave Week 2008, Amsterdam, October 2008 - IEEE proc..

2) A. Chini, M. Esposto, M. Bonaiuti, G. Verzellesi, F. Zanon, E. Zanoni, G. Meneghesso, "Influence of Device Self-Heating on the Activation Energy Extraction During Current-DLTS Measurement", European Heterostructure Technology Workshop 2008, Venice, November 2008.

3) A. Chini, V. Di Lecce, M. Esposto, G. Verzellesi, S. Lavanga, A. Cetronio, C. Lanzieri, "Trapping phenomena in field-plated high power GaAs pHEMTs", European Heterostructure Technology Workshop 2008, Venice, November 2008.

4) M. Esposto, V. Di Lecce, S. De Guido, A. Passaseo, M. De Vittorio, A. Chini, "Comparison of Cu-gate and Ni/Au-gate GaN HEMTs large signal characteristics", accepted for presentation at the 39th European Solid-State Device Research Conference, Athens, September 2009 - IEEE proc..

5) A. Chini, V. Di Lecce, M. Esposto, G. Meneghesso, E. Zanoni, "RF Degradation of GaN HEMTs and its correlation with DC stress and I-DLTS measurements", accepted for presentation at the European Microwave Week 2009, Rome, October 2009 - IEEE proc..


Journal Papers:

1) A. Chini, M. Esposto, G. Meneghesso, E. Zanoni, "Evaluation of GaN HEMT degradation by means of pulsed I-V, leakage and DLTS measurements", IEEE Electronics Letter, Vol.45, Issue 8, April 9, 2009, pp. 426-427.


DII - Information Engineering Department

Via Vignolese 905 - 41125 Modena

email: michele.esposto@unimore.it

voice: +39.059.205.6191