Self-organized lateral ordering for vertically aligned PbSe/PbEuTe quantum-dot superlattices

Raab, A.; Lechner, R. T.; Springholz, G.
February 2002
Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1273
Academic Journal
The growth of vertically aligned self-assembled PbSe/Pb[SUB 1]-[SUB x]Eu[SUB x]Te quantum-dot superlattices is found to result in a pronounced hexagonal lateral ordering tendency accompanied by a narrowing of the size distribution. In addition, the lateral dot separations and dot densities become tunable by changes in the spacer thickness with an almost twofold density increase for spacer thicknesses increasing from 100 to 275Ã…. Similar marked changes are also found for PbSe dot sizes and shapes. This could provide additional means for the tuning of the optical and electronic properties of the dots.


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