Structural and radiative evolution in quantum dots near the Stranski-Krastanow transformation
- 15 July 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 58 (4), R1726-R1729
- https://doi.org/10.1103/physrevb.58.r1726
Abstract
The evolution of Stranski-Krastanow (SK) quantum-dot (QD) formation in ternary was studied with graded structures grown via organometallic vapor-phase epitaxy. Surface-probe microscopy showed island evolution between 3.5- and 6.5-monolayer (ML) deposition. Island densities increased exponentially (over three decades with 0.2-ML deposition) before saturation ∼4.7 ML. Photoluminescence (PL) of capped structures show that the wetting-layer PL energy does not shift beyond the onset of the SK transition. PL intensities increased with QD concentration but not in proportion to QD density. After saturation, a sharp drop in PL intensity was observed, which we attribute to island coalescence and incoherent island formation. Excitation power dependence of the luminescence at different stages of QD evolution indicates a concentration dependence of optical saturation in self-forming QD’s.
Keywords
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