Time step truncation in direct simulation Monte Carlo for semiconductors

Purpose - To provide an accurate analysis of the systematic error introduced by the constant time technique free flight mechanism, due to the choice of the time step and number particles. Design/methodology/approach - A homogeneous (bulk) silicon semiconductor is studied by using direct simulation Monte Carlo (DSMC). Findings - The systematic error turns out to be of the first order with respect to the time step. The efficiency of the method is tackled. Research limitations/implications - The analysis is limited to the bulk case. Future researches will consider non homogeneous devices. Originality/value - An accurate analysis of an "old" free flight mechanism has been performed, and its limits have been stated.