Multiscale modeling of nanowire-based Schottky-barrier field-effect transistors for sensor applications.

نویسندگان

  • D Nozaki
  • J Kunstmann
  • F Zörgiebel
  • W M Weber
  • T Mikolajick
  • G Cuniberti
چکیده

We present a theoretical framework for the calculation of charge transport through nanowire-based Schottky-barrier field-effect transistors that is conceptually simple but still captures the relevant physical mechanisms of the transport process. Our approach combines two approaches on different length scales: (1) the finite element method is used to model realistic device geometries and to calculate the electrostatic potential across the Schottky barrier by solving the Poisson equation, and (2) the Landauer-Büttiker approach combined with the method of non-equilibrium Green's functions is employed to calculate the charge transport through the device. Our model correctly reproduces typical I-V characteristics of field-effect transistors, and the dependence of the saturated drain current on the gate field and the device geometry are in good agreement with experiments. Our approach is suitable for one-dimensional Schottky-barrier field-effect transistors of arbitrary device geometry and it is intended to be a simulation platform for the development of nanowire-based sensors.

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عنوان ژورنال:
  • Nanotechnology

دوره 22 32  شماره 

صفحات  -

تاریخ انتشار 2011