controlled synthesis of inas wires, dot and twin-dot array configurations by cleaved edge overgrowth...
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Controlled Synthesis of InAs Wires, Dot and Twin-Dot Array configurations by
Cleaved Edge OvergrowthE. Uccelli, M. Bichler, S. Nürnberger, G. Abstreiter, A. Fontcuberta i Morral
Nanotechnology 19, 2008
What is it all about?
Control of size and thereby emission properties of QDs is possible but control of position is more challenging
In situ cleaved edge overgrowth to control the nucleation of InAs QDs
Uccelli, Bichler, Nürnberger, Abstreiter and Fontcuberta i Morral
Cleaved Edge Overgrowth- Fabrication I
Left: L. Pfeiffer et al., Appl. Phys. Lett. 56, 1697 (1990)Right: G. Schedelbeck et al., Science 278, 1792 (1997)
Phenomenological Growth Models
Layer-by-layer
Frank-van der Merve
Layer-plus-island
Stranski-Krastanov
Island
Vollmer-Weber
γs = γsf + γf cosφ
γs ≥ γsf + γf + CkBT ln(p0/p) γs < γsf + γf + CkBT ln(p0/p)