Three-dimensional quantum transport simulation of Si-nanowire transistors based on Wigner function model

We have developed a new self-consistent and three-dimensional quantum simulator for Si-nanowire transistors based on the Wigner function model, coupled with Schrödinger-Poisson algorithm. To achieve a sufficient accuracy for calculating subthreshold current, we introduced a third-order differencing scheme for discretizing the diffusion term in the Wigner transport equation. Then, by comparing with semiclassical Boltzmann and non-equilibrim Green’s function approaches, the validity of the present simulator is discussed.