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- W2333736706 abstract "The excitonic properties of Si(core)/Ge(shell) and Ge(core)/Si(shell) nanocrystals (NC’s) with diameters of ∼1.9 nm are investigated using a combination density functional ab initio method to obtain the single particle wave functions and a configuration interaction method to compute the exciton fine structure and absorption coefficient. These core/shell structures exhibit type II confinement, which is more pronounced for the Si/Ge NC as a consequence of strain. The absorption coefficients of these NC’s exhibit a single dominant peak, which has a much larger oscillator strength than the multipeaks found for pure Si and Ge NC’s. The exciton lifetime in Si, Ge, and Ge/Si shows a small temperature dependence in the range 10–300 K, whereas in Si/Ge, the exciton lifetime decreases more than an order of magnitude in the same temperature range." @default.
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- W2333736706 date "2012-02-09" @default.
- W2333736706 modified "2023-09-25" @default.
- W2333736706 title "Configuration-Interaction Excitonic Absorption in Small Si/Ge and Ge/Si Core/Shell Nanocrystals" @default.
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- W2333736706 doi "https://doi.org/10.1021/jp2088516" @default.
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