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arXiv · 1105.5342

Multiscale Modeling of Nanowire-based Schottky-Barrier Field-Effect Transistors for Sensor Applications

Daijiro Nozaki·Jens Kunstmann·Felix Zörgiebel·Walter M. Weber·Thomas Mikolajick·Gianaurelio Cuniberti
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Abstract

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 elements 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 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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Daijiro Nozaki, Jens Kunstmann, Felix Zörgiebel, Walter M. Weber, Thomas Mikolajick, Gianaurelio Cuniberti. 2011-05-26. Multiscale Modeling of Nanowire-based Schottky-Barrier Field-Effect Transistors for Sensor Applications. https://doi.org/10.1088/0957-4484%2F22%2F32%2F325703

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