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Relaxation of hot excitons in CdZnSe/ZnSe quantum wells and quantum dots

✍ Scribed by R. Spiegel; G. Bacher; O. Breitwieser; A. Forchel; B. Jobst; D. Hommel; G. Landwehr

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
83 KB
Volume
23
Category
Article
ISSN
0749-6036

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✦ Synopsis

The relaxation dynamics of hot excitons was studied in (Zn,Cd)Se/ZnSe quantum wells and quantum dots. A fast population of the radiative excitonic ground state occurs for an excitation excess energy corresponding to an integer number of optical phonon energies. This is indicated by a spectrally narrow photoluminescence peak observed immediately after the exciting laser pulse. Spatial diffusion of excitons, controlled by the interaction between excitons and acoustic phonons, causes a distinct linewidth broadening with increasing delay time in quantum wells. In contrast, this process is found to be strongly suppressed in quantum dots.

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Size-selective spectroscopic techniques and a tight-binding calculation with restricted configuration interaction are used to study the recombination and the relaxation of excitons in CdS quantum dots. The optical absorption spectrum is calculated and is found to be close to the experiments. The ana