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Investigation of the local force approximation in numerical device simulation by full-band Monte Carlo simulation

The classical drift-diffusion (DD) model is based on transport coefficients parameterized with the local force (i.e. gradient of the quasi-Fermi potential), where the transport parameters are determined under homogeneous bulk conditions. This approximation is based on the assumption that the local distribution function in the device is completely determined by the local force. The validity of this approximation is investigated by comparison of transport parameters calculated with the device distribution function and with the one for a bulk system with the corresponding force. To this end 1D full-band Monte Carlo (FB-MC) device simulations of a SiGe-HBT and corresponding bulk simulations are performed.