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- W2014382017 abstract "Photoreflectance (PR) spectroscopy at 295 K was used to characterize GaAs/AlxGa1−xAs multiple quantum well (MQW) 10 μm infrared detector structures. From PR measurements of a representative structure, GaAs/Al0.20Ga0.80As, at different positions, the aluminum fractions were found to vary negligibly across the sample, while the variation in band-to-band MQW transition energies and E0 alloy linewidths was appreciable. The measured interband transitions of several structures designed for x=0.28 were then compared to the results of envelope-function calculations. Good agreement was found between measured and theoretical interband transitions for both heavy and light hole-to-conduction subbands. Other features observed in the spectra may be attributed to spin-orbit splittings as well as n=2 subband to subband transitions. The dominant features in the spectra were used to access well width, composition, and peak wavelengths for the MQW detector structures. Additionally, an anomalously narrow linewidth (<9 meV) was observed in the room temperature E0 spectrum of an undoped AlxGa1−xAs reference sample grown on the same system as the MQW samples. The corresponding doped sample was observed to severely broaden." @default.
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- W2014382017 date "1992-05-15" @default.
- W2014382017 modified "2023-10-18" @default.
- W2014382017 title "Characterization of GaAs/Al<i>x</i>Ga1−<i>x</i>As multiple quantum well infrared detector structures using photoreflectance" @default.
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- W2014382017 doi "https://doi.org/10.1063/1.350570" @default.
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