Modeling Buffer Layer IGBTs with an Efficient Parameter Extraction Method

A finite element physics-based punch-through IGBT model is presented, as well as its porting into standard circuit simulator SPICE. Developed model is based on solving the ambipolar diffusion equation (ADE) trough a variational formulation, resulting in a system of ODEs, from which charge carrier distribution is obtained. Implementing the model in a circuit simulator is made by means of an electrical analogy with the resulting system of ODEs. Other parts of the devices are modeled using conventional methods. The paper also discusses a parameter extraction procedure using an optimisation algorithm in order to get an efficient extraction of large number of parameters needed for physics-based IGBT models. Model is validated comparing experimental and simulated results