The exciton radiative lifetime in submonolayer (SML) InGaAsGaAs quantum dots (QDs) grown at 500 °C was measured by using time-resolved photoluminescence from 10 to 260 K. The radiative lifetime is around 90 ps and is independent of temperature below 50 K. The observed short radiative lifetime is a key reason for the high performance of SML QD devices and can be explained by the theory of Andreani [Phys. Rev. B 60, 13276 (1999)] calculating the radiative lifetime of QDs formed at the interface fluctuations of a quantum well, as the SML QDs are 20-30 nm in diameter and embedded within the lateral InGaAs QW.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)