Quantum confinement in MOVPE-grown structures with self-assembled InAs/GaAs quantum dots

0383781 - FZÚ 2013 RIV GB eng J - Článek v odborném periodiku
Kuldová, Karla - Molas, M. - Borysiuk, J. - Babinski, A. - Výborný, Zdeněk - Pangrác, Jiří - Oswald, Jiří
Quantum confinement in MOVPE-grown structures with self-assembled InAs/GaAs quantum dots.
Journal of Physics: Conference Series. Roč. 245, č. 1 (2010), s. 1-5. ISSN 1742-6588. E-ISSN 1742-6596.
[Conference on Quantum Dots 2010. Nottingham, 26.08.2010-30.08.2010]
Grant CEP: GA ČR GAP102/10/1201; GA ČR GA202/09/0676
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: photoluminescence * InAs/GaAs * quantum dots
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

We report on low-temperature, micro-photoluminescence study of quantum confinement in MOVPE-grown structures with InAs/GaAs quantum dots (QDs) with GaAs and/or strain reducing InGaAs/GaAs capping. We focus our attention on sharp emission lines, which appear in both structures at energies up to 80 meV below the wetting line emission. Power-dependent measurements confirmed their attribution to single excitons as well as biexcitons. Negative binding energy of biexcitons with systematic dependence on their energy was observed. It has been proposed that the investigated emission lines result from radiative recombination in flat non-fully developed QDs in the investigated structure. The attribution is confirmed by transmission electron microscopic analysis of investigated structures.
Trvalý link: http://hdl.handle.net/11104/0213619