Electrostatics of partially gated carbon nanotube FETs

TitleElectrostatics of partially gated carbon nanotube FETs
Publication TypeJournal Article
Year of Publication2004
AuthorsClifford, J. P., D. L. John, L. C. Castro, and D. L. Pulfrey
JournalNanotechnology, IEEE Transactions on
Pagination281 - 286
Date Publishedjun.
Keywordsboundary conditions, C, carbon nanotube field-effect transistors, carbon nanotubes, charge flow, drain end contacts, electrostatic devices, FET, field effect transistors, finite element analysis, finite-element method, gate dielectric, gate electrode, gated carbon nanotube, geometrical properties, nanotube channel, nanotube devices, Poisson equation, potential energy profile, semiconductor device models, source end contacts

The finite-element method is used to solve Poisson's equation, under equilibrium conditions, for coaxial carbon nanotube field-effect transistors in which the gate electrode does not entirely cover the nanotube channel between the source- and drain-end contacts. A conformal transformation is applied to overcome the problems that arise in this open structure of specifying boundary conditions and of terminating the model space. The effect on the potential distribution within the transistor of changing various geometrical properties of the device is investigated, and some special conditions under which appropriate boundary conditions may be defined a priori are identified. The effects on the potential energy profile along the nanotube of varying the work function of the end contacts, and of introducing charge into the gate dielectric, are also investigated. The latter is shown to be effective in suppressing the otherwise dominant role that the end contacts play in determining the barrier to charge flow in the nanotube, thereby allowing bulk control to occur.


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