Dynamics of the radiative recombination in cylindrical nanostructures with type-II band alignment
Abstract
The electron and hole states and confining potential for cylindrical core-shell structure with type-II band alignment are obtained from a numerical solution of the self-consistent Schrödinger-Poisson system of equations. The photoluminescence (PL) kinetics is theoretically analyzed, with the nanostructure size dispersion taken into account. The results are applied to the radiative recombination in the system of ZnTe/ZnSe stacked quantum dots. A good agreement with both cw and time-resolved experimental observations is found. It is shown that size distribution results in the PL decay that has essentially nonexponential behavior even at the tail of the decay where the carrier lifetime is almost the same due to slowly changing overlap of the electron and hole wave functions. Finally, a model situation applicable to colloidal core-shell nanowires is investigated and discussed.
- Publication:
-
Physical Review B
- Pub Date:
- March 2009
- DOI:
- 10.1103/PhysRevB.79.115307
- Bibcode:
- 2009PhRvB..79k5307S
- Keywords:
-
- 78.67.Lt;
- 73.21.Hb;
- 78.47.Cd;
- Quantum wires;
- Quantum wires;
- Time resolved luminescence