Efficient small-signal analysis using the nonequilibrium green function method including electron-phonon scattering

Abstract

This paper presents the small-signal (ac) analysis using the nonequilibrium Green's function (NEGF) method including electron-phonon scattering. By coupling ac NEGF with the Poisson equation, the self-consistent solu tion considering the long-range Coulomb interaction can be obtained. An efficient coupling scheme is proposed in which the Poisson equation and ac NEGF are fully coupled within a single matrix incorporating the elec tron-phonon scattering term, and the ac potential, ac Green's function, and ac scattering self-energy are effectively linked. A nanowire metal-oxide-semiconductor field-effect transistor (MOSFET) is simulated in this work. The ac responses are compared with the steady-state (dc) results for verification. Moreover, the effect of electron-phonon scattering is investigated by comparison with the ballistic transport results.