Quantum efficiency and oscillator strength of site-controlled InAs quantum dots

Albert, F.; Stobbe, S.; Schneider, C.; Heindel, T.; Reitzenstein, S.; Höfling, S.; Lodahl, P.; Worschech, L.; Forchel, A.
April 2010
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p151102
Academic Journal
We report on time-resolved photoluminescence spectroscopy to determine the oscillator strength (OS) and the quantum efficiency (QE) of site-controlled InAs quantum dots nucleating on patterned nanoholes. These two quantities are determined by measurements on site-controlled quantum dot (SCQD) samples with varying thickness of the capping layer. We determine radiative and nonradiative decay rates, from which we calculate an OS of 10.1±2.6 and an encouragingly high QE of (47±14)% for the SCQDs. The nonideal QE is attributed to nonradiative recombination at the etched nanohole interface.


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