Electron capture and intra-band relaxation by means of Auger processes in colloidal semiconductor nanocrystals

The electron relaxation dynamics in combination with LO phonon-assisted electron capture and intra-dot Auger scattering processes in a spherical quantum dot embedded in non-polar matrix is presented theoretically. The electron capture efficiency is investigated as a function of the lattice temperature and quantum dot radius for a deferent injected electron concentration, taking into account the confinement effect of the polar optical phonons in spherical quantum dots. Exact numerical calculations for the phonon-assisted electron capture rate as well as for the Auger scattering rate in colloidal CdSe quantum dot have been carried out. These calculations are consistent with experiment.