  We study the carrier capture and relaxation due to Coulomb scattering in
nitride-based quantum dots on the basis of population kinetics. For the states
involved in the scattering processes the combined influence of the
quantum-confined Stark effect and many-body renormalizations is taken into
account. The charge separation induced by the built-in field has important
consequences on the capture and relaxation rates. It is shown that its main
effect comes through the renormalization of the energies of the states involved
in the collisions, and leads to an increase in the scattering efficency.
