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• W2515674947 endingPage "3301" @default.
• W2515674947 startingPage "3295" @default.
• W2515674947 abstract "Optical transition energies and carrier dynamics in colloidally synthesized 2.0 ± 0.8 nm Ge1–xSnx quantum dots (x = 0.055–0.236) having visible luminescence were investigated using steady-state and time-resolved photoluminescence (PL) spectroscopy supported by first-principles calculations. By changing Sn content from x = 0.055 to 0.236, experimentally determined HOMO–LUMO gap at 15 K was tuned from 1.88 to 1.61 eV. Considering the size and compositional variations, these values were consistent with theoretically calculated ones. At 15 K, time-resolved PL revealed slow decay of luminescence (3–27 μs), likely due to the recombination of spin-forbidden dark excitons and recombination of carriers trapped at surface states. Increasing Sn concentration to 23.6% led to 1 order of magnitude faster recombination. At 295 K, PL decays were 3 orders of magnitude faster (9–28 ns) owing to the thermal activation of bright excitons and carrier detrapping from surface states." @default.
• W2515674947 created "2016-09-16" @default.
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• W2515674947 date "2016-08-11" @default.
• W2515674947 modified "2023-10-18" @default.
• W2515674947 title "Energy Gap Tuning and Carrier Dynamics in Colloidal Ge_1–<i>x</i>Sn_<i>x</i> Quantum Dots" @default.
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• W2515674947 doi "https://doi.org/10.1021/acs.jpclett.6b01333" @default.
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• W2515674947 hasPublicationYear "2016" @default.
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