Malko, A.Baier, M. H.Karlsson, K. F.Pelucchi, E.Oberli, D.Y.Kapon, E.2008-02-292008-02-292008-02-29200610.1063/1.2177547https://infoscience.epfl.ch/handle/20.500.14299/19745WOS:000235553300024We demonstrate efficient, regulated single-photon operation from site-controlled InGaAs quantum dots (QDs) grown on a prepatterned substrate. Under nonresonant optical excitation, carriers trapped at structural or compositional defects of the adjacent nanostructures led to a degradation of the single-photon statistics from a QD. When the QD was excited quasiresonantly, single photons were emitted and a nearly complete suppression of multiphoton emission was achieved, making these QDs promising candidates for effective solid-state single-photon sources. (c) 2006 American Institute of Physics.text::journal::journal article::research article