Photoluminescence from low temperature grown InAs/GaAs quantum dots

D. Sreenivasan, J.E.M. Haverkort, T.J. Eijkemans, R. Nötzel

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The authors investigated a set of self-assembled InAs/GaAs quantum dots (QDs) formed by mol. beam epitaxy at low temp. (LT, 250 DegC) and postgrowth annealing. A QD photoluminescence (PL) peak around 1.01 eV was obsd. The PL efficiency quickly quenches between 6 and 40 K due to the tunneling out of the QD into traps within the GaAs barrier. The PL efficiency increases by a factor of 45-280 when exciting below the GaAs band gap, directly into the InAs QD layer. This points towards good optical quality QDs, which are embedded in a LT-GaAs barrier with a high trapping efficiency. [on SciFinder (R)]
Originele taal-2Engels
Pagina's (van-tot)112109-1/3
TijdschriftApplied Physics Letters
Nummer van het tijdschrift11
StatusGepubliceerd - 2007

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