  A 1D model study of charge transport in nano-devices is made by comparing
multi-configuration time dependent Hartree-Fock and frozen core calculations.
The influence of exchange and Coulomb correlation on the tunneling current is
determined. We identify the shape of the tunneling barrier and the resonance
structure of the nano-device as the two dominant parameters determining the
electron transport. Whereas the barrier shape determines the size of the
tunneling current, the resonances determine the structure of the current.
