Abstract
We demonstrate a method to controllably reduce the density of self-assembledInP quantum dots (QDs) by cyclic deposition with growth interruptions.Varying the number of cycles enabled a reduction of the QD density from7.4 × 1010 cm − 2 to1.8 × 109 cm − 2 for the same total amount of deposited InP. Simultaneously, a systematic increase of the QDsize could be observed. Emission characteristics of different-sized InP QDs were analyzed.Excitation power dependent and time-resolved measurements confirm a transition from type Ito type II band alignment for large InP quantum dots. Photon autocorrelation measurementsof type I QDs performed under pulsed excitation reveal pronounced antibunching (g(2)(τ = 0) = 0.06 ± 0.03) as expected for a single-photon emitter. The described growth routine has great promisefor the exploitation of InP QDs as quantum emitters.
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