Oswald ripening and shape transitions of self-assembled PbSe quantum dots on PbTe (111) during annealing

Raab, A.; Springholz, G.
November 2000
Applied Physics Letters;11/6/2000, Vol. 77 Issue 19
Academic Journal
The thermal stability of faceted self-assembled PbSe quantum dots during annealing is investigated. With increasing annealing time, the dot density is found to decrease rapidly with a simultaneous increase of the average island volumes. In addition, a shape transition from pyramidal islands to truncated pyramids is observed for islands exceeding a critical height of 160 Å. The evolution of island volumes and densities is consistent with Oswald ripening by interface-reaction-limited mass transfer. This is a clear indication that the as-grown islands do not represent an equilibrium structure and that their narrow size dispersion is a purely kinetic effect. © 2000 American Institute of Physics.


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