Optical investigations of the dynamic behavior of GaSb/GaAs quantum dots
Journal
Applied Physics Letters
Journal Volume
68
Journal Issue
11
Pages
1543-1545
Date Issued
1996
Author(s)
Abstract
Time-resolved radiative recombination measurements on GaSb quantum dots have been performed. The GaSb quantum dots are grown by molecular beam epitaxy on (100) GaAs through a self-assembly process. Time-resolved measurements show that, after a rapid hole capture process, the photoluminescence decays with a fast and a slow component. The fast component is shortened significantly with higher excitation intensity while the slow component is roughly constant. The radiative lifetimes are much longer than the lifetimes of ordinary GaSb quantum wells with a straddling band lineup. These results support a staggered band lineup and space charge induced band-bending model.
Type
journal article