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Evolution of the energy levels in quantum dot ensembles with different densities
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14.The size of the QDs can be partly controlled by the substrate temperature during the growth. Lower growth temperatures give smaller QDs yielding larger intersublevel energy spacings.
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16.Some gradients in the substrate temperature and in the arsenic pressure are likely to also be present when growing on a stationary wafer, but the main phenomena observed here are believed to originate from varying the InAs coverage.
17.The coverage scale in ML is obtained by calibrating the growth rate in the center of the wafer (here 0.02 nm/s), and from determining the gradient in coverage between the center and the edges of the wafer using secondary ion mass spectroscopy (SIMS) and/or from PL measurements on other calibration samples.
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19.Similar results have been observed for ensembles with various densities obtained by MOCVD on surfaces with steps: R. Leon, S. Marcinkevicius, X. Liao, D. Cockayne, and S. Fafard, Phys. Rev. B 60 (in press).
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21.The observed blueshift with the narrowing of the intersublevel energy spacing and the suppression of the excited state emission might be a consequence of a different alignment of the band minima caused by the strain interactions in the higher density ensembles.
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23.S. Fafard and C. Ni. Allen, Appl. Phys. Lett. (in press).
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