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- W2089901091 abstract "We report on the shell-to-core carrier-transfer in GaAs/Al0.1Ga0.9As core-shell nanowires grown on Si(1 0 0) substrates via molecular beam epitaxy. The nanowires are dominantly zincblende and are tilted with respect to the substrate surface. Photoluminescence (PL) excitation spectrosocopy at 77 K revealed an abrupt increase in the GaAs PL intensity at excitation above the Al0.1Ga0.9As shell bandgap which is attributed to shell to core carrier-transfer. More carriers from the Al0.1Ga0.9As transfer to the GaAs at T>90 K, as observed in the time-resolved PL and temperature dependence of the relative PL intensities of GaAs and Al0.1Ga0.9As due to the ionization of the traps within the Al0.1Ga0.9As. Using a coupled rate equation model that takes into account shell to core carrier-transfer, the average recombination time constants of Al0.1Ga0.9As shell τrec,s=400 ps (580 ps) and GaAs core τrec,c=600 ps (970 ps) were obtained from the time-resolved PL at 300 K (77 K). Carrier-transfer time constants τCT=50 ps (55 ps) at 300 K (77 K) were also obtained." @default.
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- W2089901091 date "2014-11-01" @default.
- W2089901091 modified "2023-10-16" @default.
- W2089901091 title "Shell to core carrier-transfer in MBE-grown GaAs/AlGaAs core–shell nanowires on Si(100) substrates" @default.
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- W2089901091 doi "https://doi.org/10.1016/j.jlumin.2014.06.008" @default.
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