Information about HARI-GRAPHENE

Published on July 23, 2014

Author: hari35413

Source: authorstream.com


Seminar on GRAPHENE TECHNOLOGY AND ITS APPLICATION IN COMMUNICATION SYSTEMS: Seminar on GRAPHENE TECHNOLOGY AND ITS APPLICATION IN COMMUNICATION SYSTEMS Presented by M.HARIKRISHNAN M.Tech ECE I Year Contents: Contents Objective Introduction Overview of Graphene Properties of Graphene Challenging issues in Graphene technology Graphene transistors and its tunability Operation of Graphene transistor at THZ Summary Objective: Objective To realize the advantage of Graphene technology at high frequency communication system and to study the operation of Graphene transister Introduction: Introduction Silicon chip speed limited in GHz range. To get frequency range in TeraHz range we are switching over to Graphene Technology Research on graphene technology involves digital transistors for computers Overview of Graphene: Overview of Graphene Graphene -flat monolayer of carbon atoms -(2D) honeycomb lattice 2-dimensional hexagonal lattice of carbon sp 2 hybridized carbon atoms Basis for C-60 (bucky balls), nanotubes, and graphite among strongest bonds in nature Properties of Graphene: Properties of Graphene High Electron Mobility High frequency operation Optical properties -high opacity, Saturable absorption Thermal conductivity Strength-breaking strength of 42N/m Challenging issues in Graphene technology: Challenging issues in Graphene technology Difficulty in turning the current off due to zero-energy gap in Graphene There are three ways to overcome this problem 1.Apply electric field across transister channel 2.To cut graphene into very small ribbons(nm) 3.geometrically manipulating graphene nanowire Graphene transisters and its tunability: Graphene transisters and its tunability Graphene transister-nano scale device Transister channel-2nm-teraHertz speed Features of the graphene transistor include: ability to operate at room temperature. a size one atom by 10 atoms wide. extreme sensitivity. ability to operate with the application of very low voltages. Continued…: Continued… Continued…: Continued… Continued…: Continued… Continued…: Continued … Continued…: Continued… Summary: Summary Graphene based electronics faces many obstacles before it can become a competitive technology. The possible ways to overcome problems in this technology have been discussed. The main driver for Graphene technology is clearly mobility Phase II seminar will deal with the broadband connectivity at TeraHertz frequency range References: References [1] N.P.Guisninger an d MS Arnold," Beyond Silicon: Carbon based Nanotechnology ", MRS Bulletin, vol.35, April2010. [2] J.S.Moon et al.," Epitaxial graphene RF on Si-face 6H-SIC substrate ,"IEEE Electron Devices.Let,Vol.60,pp650-652,2009 [3]A.K Gein K.S.Npvoselov," The rise of graphene ",Nature materails,Vol-6,pp183-191, 2007 [4]F.Rana," Graphene terahertz plasmon oscillators ," IEEE Transactions on Nanotechnology vol.7,pp-91-99,Jan 2008 [5]F.Wang,et,al., " Gate- varialble optical transitions in graphene ",Science,vol.320,pp-206- 209,2008

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