Abstract

An analytical model for minority carrier transport and recombination in quasi-neutral regions at arbitrary injection levels is presented. The proposed approach retains a general dependence of the transport parameters on the doping concentration, and can thus be applied to arbitrary doping profiles. It also includes heavy doping effects and injection-dependent recombination mechanisms. Simple closed-form analytical expressions are derived for the minority-carrier currents in bipolar transistors, and for the effective recombination velocity of high-low junctions.

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