We study the steady-state and ballistic transport properties of semiconducting zig-zag carbon nanotubes (CNTs) using semiclassical Monte Carlo simulation. Electron-phonon scattering is the only type of interaction included in the model. The band structure and phonon dispersion are derived from that of graphene by the zone folding method. Steady-state drift velocity and low-field mobility are calculated for CNTs with wrapping index ranging from n=10 to n=59, i.e., for a diameter range of 0.78−4.62nm. Principally, a transient analysis of transport under uniform driving field is realized and gives the fraction of ballistic electrons as a function of CNT length and the mean free path (MFP) for acoustic and optical phonons scattering. The probability to have ballistic electrons on a given distance appears to be higher for nanotubes of large diameter and depends on the field applied.
Abstract-On the basis of acquired knowledge, we present a DC compact model designed for the conventional CNTFET (C-CNTFET) featuring a doping profile similar to n-MOSFET. The specific enhancement lies on the implementation of a physical based calculation of the minima of energy conduction subbands. This improvement allows a realistic analysis of the impact of CNT helicity and radius on the dc characteristics. The purpose is to enable the circuit designers to challenge CNTFET potentialities for performing logical or analogical functionalities within complex circuits.
Carbon Nanotube (CNT) appears as a promising candidate to shrink field-effect transistors (FET) to the nanometer scale. Extensive experimental works have been performed recently to develop the appropriate technology and to explore DC characteristics of carbon nanotube field effect transistor (CNTFET). In this work, we present results of Monte Carlo simulation of a coaxially gated CNTFET including electron-phonon scattering. Our purpose is to present the intrinsic transport properties of such material through the evaluation of electron mean-free-path. To highlight the potential of high performance level of CNTFET, we then perform a study of DC characteristics and of the impact of capacitive effects. Finally, we compare the performance of CNTFET with that of Si nanowire MOSFET.
RésuméInfluence des effets capacitifs sur les performances dynamiques d'un CNTFET par la méthode Monte Carlo. Le nanotube de carbone (CNT) est à ce jour l'un des candidats les plus prometteurs pour faire passer le transistor à effet de champ (FET) à l'échelle du nanomètre. Des recherches intensives sont en cours afin de déterminer les caractéristiques statiques et dynamiques des transistors à nanotube de carbone (CNTFET). Nous présentons dans cette étude des résultats de simulations de CTNFET par la méthode Monte-Carlo avec prise en compte des interactions électrons-phonons. Un des objectifs est de présenter les propriétés du transport pouvant être atteintes dans ce matériau par une évaluation du libre parcours moyen des porteurs. Une étude des caractéristiques statiques du CNTFET est réalisée et permet de mettre en avant l'influence du 2 contrôle capacitif par la grille sur les performances. Enfin nous comparons les performances d'un CNTFET avec celles obtenues par simulation d'un transistor à nanofil de Silicium.
Metal/carbon nanotube Schottky contacts are studied using particle Monte Carlo simulation. The developed model is based on the WKB approximation and on the Landauer formula. Results are in fairly good agreement with experimental data.
Nous présentons ici le projet Nano-Ecole Ile-de-France de sensibilisation aux nanosciences et nanotechnologies à destination des écoles, des lycées et du grand public. Nous exposons le format et le détail du contenu des interventions réalisées au sein d'établissements scolaires. Enfin nous présentons la mise en place de formations proposées aux enseignants du secondaire ainsi que les actions à destination des élèves de primaire et du grand public.
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