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Low-density InP quantum dots embedded in Ga0.51In0.49P with high optical quality realized by a strain inducing layer

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7 Author(s)
Richter, Daniel ; Institut für Halbleiteroptik und Funktionelle Grenzflächen and Research Center SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany ; RoBbach, Robert ; Schulz, W. ; Koroknay, Elisabeth
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We present a method to reduce the intrinsically high InP quantum dot density embedded in a Ga0.51In0.49P barrier by introducing an InGaAs quantum dot seed layer. The additional strain reduces the total InP quantum dot density by around one order of magnitude from 2×1010 to 3×109 cm-2 but only ∼1% of the InP nanostructures seem to be optically active (107 cm-2). Therefore, microphotoluminescence measurements could be accomplished without masks. We found resolution-limited photoluminescence linewidths E<100 μeV), good signal-to-noise ratios (∼65), single-photon emission behavior [g(2)(τ=0)=0.3], and excitonic decay times of typically between 1 and 2 ns. Furthermore the structural quantum dot properties were investigated.

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Applied Physics Letters  (Volume:97 ,  Issue: 6 )