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• W2893061548 abstract "Shallow impurity doping is an efficient route to tailor optical and electronic features of semiconductor quantum dots (QDs). However, the effect of doping is often smeared by the size, shape, and composition inhomogeneities. In this paper, we study optical properties of almost monodispersed spherical silicon (Si) QDs that are heavily doped with boron (B) and phosphorus (P). The narrow size distribution achieved by a size-separation process enables us to extract doping-induced phenomena clearly. The degree of doping-induced shrinkage of the optical band gap is obtained in a wide size range. Comparison of the optical band gap with theoretical calculations allow us to estimate the number of active donor-acceptor pairs in a QD. Furthermore, we found that the size and detection energy dependence of the luminescence decay rate is significantly modified below a critical diameter, that is ∼5.5 nm. In the diameter range above 5.5 nm, the luminescence decay rate is distributed in a wide range depending on the detection energy even in size-purified Si QDs. The distribution may arise from that of donor-acceptor distances. On the other hand, in the diameter range below 5.5 nm the detection energy dependence of the decay rate almost disappears. In this size range, which is smaller than twice of the effective Bohr radius of B and P in bulk Si crystal, the donor-acceptor distance is not a crucial factor to determine the recombination rate." @default.
• W2893061548 created "2018-10-05" @default.
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• W2893061548 date "2018-09-28" @default.
• W2893061548 modified "2023-10-17" @default.
• W2893061548 title "Donor–Acceptor Pair Recombination in Size-Purified Silicon Quantum Dots" @default.
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• W2893061548 doi "https://doi.org/10.1021/acs.nanolett.8b03489" @default.
• W2893061548 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30265553" @default.
• W2893061548 hasPublicationYear "2018" @default.
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