Spatial ordering in InP/InGaP nanostructures

Bortoleto, J. R. R.; Gutiérrez, H. R.; Cotta, M. A.; Bettini, J.; Cardoso, L. P.; de Carvalho, M. M. G.
May 2003
Applied Physics Letters;5/19/2003, Vol. 82 Issue 20, p3523
Academic Journal
We report the observation of a spatially-ordered bidimensional array of self-assembled InP quantum dots grown on slightly In-rich InGaP layers. The alignment of InP dots is observed along [100] and [010] directions. This effect is enhanced when 2° off vicinal substrates are used; it is also strongly dependent on growth temperature. Our results suggest that the density and size of CuPt-type atomically ordered regions as well as compositional modulation of InGaP layers play an important role on the spatial alignment of InP/InGaP quantum dots.


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