Carrier dynamics in red-emitting self-organised InAs–AlGaAs quantum dots with indirect barriers

Abstract We report the results of time-resolved photoluminescence (TR-PL) spectroscopy on self-organised InAs–Al 0.6 Ga 0.4 As quantum dots with indirect barriers. The TR measurements confirm that carriers excited in Al 0.6 Ga 0.4 As barriers are captured by the dots on the time scale of 45– 60 ps despite the indirect nature of the barriers. The dynamics of the PL decay time are consistent with a carrier hopping process between dots.