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- W2072442209 abstract "Heteroepitaxial growth of −5.5% lattice-mismatched PbSe on PbTe (1 1 1) is studied using in situ reflection high-energy electron diffraction and atomic force microscopy. It is shown that for this tensily strained heteroepitaxial system the misfit strain relaxes via formation of coherent nanosized 3D islands. The formation of these self-assembled PbSe quantum dots proceeds in a two-step process: At a critical coverage of 1.5 monolayers, first chains of PbSe islands (named type A) are nucleated on the wetting layer, whereas homogenous nucleation (type B) sets in at a coverage of 2.4 monolayers. This two-step nucleation process leads to a pronounced bimodal size distribution. Surprisingly however, all dots exhibit the same pyramidal shape due to the formation of well-defined (1 0 0) side facets, which indicates that a special nucleation mechanism is responsible for the creation of the 1D chain-like arrangement of the type A dots." @default.
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- W2072442209 date "1999-05-01" @default.
- W2072442209 modified "2023-10-16" @default.
- W2072442209 title "Molecular beam epitaxy of highly faceted self-assembled IV–VI quantum dots with bimodal size distribution" @default.
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- W2072442209 doi "https://doi.org/10.1016/s0022-0248(98)01541-3" @default.
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