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• W2011845913 abstract "Freestanding $n$-type intentionally doped GaN layers grown by halide vapor phase epitaxy (HVPE) were studied by transient photoluminescence (PL). Concentrations of silicon and oxygen were varied in the range between 10${}^{17}$ and 10${}^{18}$ cm${}^{ensuremath{-}3}$, as confirmed by secondary ion mass spectroscopy (SIMS). We show that a reduction of the background silicon concentration by one order of magnitude compared to the background level in undoped samples can be achieved by incorporation of oxygen during the growth. A strong band gap narrowing (BGN) of ensuremath{sim}6 meV was observed with increasing doping in the studied samples. The low temperature PL recombination time for donor-bound excitons (DBEs) was found to depend significantly on donor concentration. A model assuming generation of DBEs by capturing of free excitons by neutral donors explains the experimental results at low temperature. From fitting the experimental DBE lifetime to the model, the donor concentration dependence for O and Si donors could be reproduced. An effective exciton capture cross-section was found to be ensuremath{sim}9.4 ifmmodetimeselsetexttimesfi{} 10${}^{ensuremath{-}15}$ and 1.2 ifmmodetimeselsetexttimesfi{} 10${}^{ensuremath{-}14}$ cm${}^{2}$ for silicon and oxygen donors, respectively." @default.
• W2011845913 created "2016-06-24" @default.
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• W2011845913 date "2011-10-27" @default.
• W2011845913 modified "2023-10-06" @default.
• W2011845913 title "Effect of silicon and oxygen doping on donor bound excitons in bulk GaN" @default.
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• W2011845913 doi "https://doi.org/10.1103/physrevb.84.165213" @default.
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