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- W2898869135 abstract "In this paper, we report on the formation of heavily n-doped Ge:Sb layers on Si(001) substrates by MBE with active dopant concentration exceeding 1020 cm−3 and discuss their thermal stability. Rapid thermal annealing was applied to the samples with different doping densities being both below and above the equilibrium solubility limit of Sb in Ge. Experimentally obtained changes of the impurity atomic concentration and carrier density were attributed to Sb bulk diffusion, desorption and dopant clustering. The qualitatively different modifications of room-temperature photoluminescence (PL) due to annealing were obtained for the n-Ge layers with different doping levels. In particular, for the doping levels which were below or close to the equilibrium solid solubility the overall positive impact of annealing on the PL intensity was observed. However, for the n-Ge layers with higher doping levels a more complex behavior was obtained, namely, a significant drop followed by the subsequent partial restoration of the PL intensity with the increase of annealing temperature. Changes of the PL response were attributed to the two main processes which occur during thermal treatment—annealing of the point defects generated due to low-temperature growth of a doped layer and dopant cluster formation—which have the opposite impact on the PL intensity. The obtained results allowed us to formulate the recommendations on thermal treatment of the n-type doped Ge layers, which may be useful for Ge-based Si photonics applications." @default.
- W2898869135 created "2018-11-09" @default.
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- W2898869135 date "2018-11-20" @default.
- W2898869135 modified "2023-10-15" @default.
- W2898869135 title "Influence of thermal annealing on the electrical and luminescent properties of heavily Sb-doped Ge/Si(001) layers" @default.
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- W2898869135 doi "https://doi.org/10.1088/1361-6641/aaec64" @default.
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