Impact of non-uniform carrier density on the determination of metal induced recombination losses

摘要

We evaluate in detail the impact of sample properties on the accuracy of a simple area-weighted approach to determine the local dark saturation current density at metal contacts j_(0,met). Using metallized samples, we further compare the apparent j_(0,met) resulting from this simple approach to the j_(0,met) value determined using numerical simulations with Quokka3. The analysis shows that the assumption of a uniform carrier density of the area-weighted approach leads to a significant underestimation of j_(0,met) which depends strongly on sample properties as e.g. the base resistivity ρ_B and j_(0,met) itself. This is confirmed by experimental data using conventional metallized samples, which demonstrate an underestimation of j_(0,met) of up to 20% when using the area-weighted approach compared to numerical simulations.