• 文献标题:   Explicit Model of Channel Charge, Backscattering, and Mobility for Graphene FET in Quasi-Ballistic Regime
  • 文献类型:   Article
  • 作  者:   UPADHYAY AK, KUSHWAHA AK, RASTOGI P, CHAUHAN YS, VISHVAKARMA SK
  • 作者关键词:   backscattering coefficient, charge density, driftdiffusion, fermi velocity, mobility, quasiballistic
  • 出版物名称:   IEEE TRANSACTIONS ON ELECTRON DEVICES
  • ISSN:   0018-9383 EI 1557-9646
  • 通讯作者地址:   IIT Indore
  • 被引频次:   0
  • DOI:   10.1109/TED.2018.2877631
  • 出版年:   2018

▎ 摘  要

Ballistic (collision free) and drift-diffusive (collision dominated) transport mechanisms are both present in graphene, and they together contribute in the current conduction in a graphene FET (GFET). In this paper, we propose an analytical drain current model based on ballistic (n(B)) and drift-diffusive (n(D)) charge densities, backscattering coefficient (R), and quasi-ballistic mobility (mu(eff)). nB is calculated using the McKelvey flux theory and nD using the surface potential approach. A closed-form analytical expression is derived for the backscattering coefficient, which is valid under both low and high electric field conditions. The effective quasi-ballistic mobility is obtained by considering both scattering-dominated and scattering free mobilities. The proposed model is well aligned with experimental data, in all regions of operation, for single- and double-gate GFETs.