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Investigation of defects created by growth of InAs quantum dots in GaAs

2003; Wiley; Issue: 3 Linguagem: Inglês

10.1002/pssc.200306327

1862-6351

L. Dózsa, Zs. J. Horváth, Pavel Hubı́k, J. Krištofik, Jiřı́ J. Mareš, E. Gombia, P. Frigeri, R. Mosca, Stefano Franchi, B. Pécz, László Dobos,

Quantum Dots Synthesis And Properties

Defects created by self-organized InAs quantum dot growth in a GaAs matrix were investigated. Growth of the quantum dots was found to enhance strongly the tendency towards inhomogeneous growth. The inhomogeneity seems to stem from point defect clusters generated in the vicinity of a molecular beam epitaxy (MBE)/atomic layer MBE (ALMBE) interface. The point defects identified are characteristic of MBE and ALMBE GaAs layers. The InAs quantum dot states and interface states are not clearly detected since they are located in a depleted layer surrounding the point defects clusters.