We examine the impact of metal spikes on B-emitters on metal contact recombination.
A three dimensional model with the QSSPC technique is used for simulation.
Shallow spikes have minor effect on j0,met, deep spikes increase j0,met abruptly.
Spikes should not penetrate a critical zone starting 150 nm above the pn-junction.
Deeper profiles are more robust against deep spikes, as samples confirm.