Auger process in CdS/ZnS core-shell quantum dots

Auger processes are investigated for CdS/ZnS core-shell quantum dots. Auger recombination (AR) lifetime and electron relaxation inside the core are computed. Using the effective-mass theory and by solving a three-dimension Schrödinger equation we predict the dependence of Auger relaxation on size of core-shell nanocrystals. We considered in this work different AR processes: the excited electron (EE), excited hole (EH), multiexciton AR type. Likewise, Auger multiexciton recombination rates are predicted for biexciton. Our results show that biexciton AR type is more efficient than the other AR process (excited electron (EE) and excited hole (EH)). We also found that electron Auger relaxation P→SP→S is very efficient in core-shell nanostructures.

► The electron relaxation inside the core is computed in CdS/ZnS core-shell QDs.
► Different Auger recombination (AR) processes are considered.
► Numerical calculations are performed to calculate the AR rate in CdS/ZnS core-shell QDs.
► Our results show that biexciton AR type is more efficient than the other AR process.
► We found that electron Auger relaxation P→SP→S is very efficient in core-shell QDs.