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Archivio digitale delle tesi discusse presso l’Università di Pisa

Tesi etd-03252024-075956


Tipo di tesi
Tesi di dottorato di ricerca
Autore
CANNAVO', EMMANUELE
URN
etd-03252024-075956
Titolo
COMPUTATIONAL DEVICE MODELING BASED ON 2-DIMENSIONAL MATERIALS
Settore scientifico disciplinare
ING-INF/01
Corso di studi
INGEGNERIA DELL'INFORMAZIONE
Relatori
tutor Prof. Fiori, Gianluca
Parole chiave
  • 2-dimensional materials
  • computational nanoelectronics
  • graphene
  • heterostructures
  • materials science
  • nanomagnets
  • negf
  • quantum cascade detector
  • spintronics
  • wannier functions
Data inizio appello
28/03/2024
Consultabilità
Non consultabile
Data di rilascio
28/03/2027
Riassunto
The thesis work consisted in applying a state-of-the art computational approach to the modelling and simulation of different electronic devices based on 2-dimensional materials.
The Multi-Scale method, comprising density functional theory calculations, Hamiltonian wannierization and ballistic or semi-classical electronic transport simulations, enables a thorough and accurate study of current flow in a device.
This methodology was first applied to the analysis of transmission across multiple 2-dimensional materials-based vertical homo- and heterostructures, considering different stacking orientations and flake overlaps; it was then used to model and simulate a combined spin filter and transistor device based on the CrI3 nanomagnet, where an external electric, instead of magnetic, field enables the spin selection; then, I modelled and simulated a 2-dimensional materials-based field-effect transistor used as a reader for a quantum cascade detector, examining different channel materials and computing the responsivity. Subsequently, I worked on reproducing experimental I-V curves referred to ultrashort channel graphene field effect transistors to be used for radio-frequency applications; finally, I elaborated a method to reduce the size of the Wannier Hamiltonian in order to speed up transport simulations.
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