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- W2766836512 abstract "Abstract We grew InAs quantum dots (QDs) embedded in a GaAs 0982 N 0.018 quantum well—a dot-in-a-well (DWELL) structure—that exhibits emission at wavelengths of up to 1.31 µm at 19 K and the full width at half maximum (FWHM) of 59 meV which are lower those of the InAs/GaAs QDs (1.09 µm and 82 meV, respectively), the reference sample. Our results can be explained as follows: modified strain field at the GaAsN matrix/InAs QDs due to insertion of ultrathin GaAsN matrix, or nitrogen-induced point defects formed in the ultrathin GaAsN matrix during growth, could promote the homogeneous distribution of InAs QDs on the surface. The GaAsN capping layer evidently enhances the emission wavelength by reducing the overall compressive strain within the QDs. DWELL with ultrathin matrix layer annealed at 800 °C exhibited 130-fold improvement in PL intensity, as compared to the as-grown sample, attributed to annihilation of N-related point defects. The results of this study are expected to be useful in fabricating DWELL-based infrared photodetectors with narrow spectral linewidth." @default.
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- W2766836512 date "2018-02-01" @default.
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- W2766836512 title "Ultrathin GaAsN matrix-induced reduced full width at half maximum of GaAsN/InAs/GaAsN dot-in-a-well heterostructures with extended emission wavelength" @default.
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- W2766836512 doi "https://doi.org/10.1016/j.jlumin.2017.10.056" @default.
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