On the MC simulation of ohmic contacts
A Monte Carlo technique to simulate ohmic contacts used for the purposes of the simulation of ultra-short injection pockets is presented. The emphasis is on the energy distribution of the particles as they are injected into the device itself and should be adequate for unipolar devices such as sub-micrometric FETs. The effects at the cathode pocket of the initial distribution, Maxwellian (M), Semi-Maxwellian (SM) or Displaced-Maxwellian (DM), of the electric field, and of the pocket length, have been tested. Results for (M) and (SM) are very similar and precautions must be taken to avoid unphysical behaviour. (DM) is expected to be physically more realistic and the simulation may be more efficient. The method to obtain the adequate displacement in the distribution and to find the suitable pocket length are also described.
ohmic contacts monte carlo methods ultra-short devices