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• W2032482650 startingPage "1371" @default.
• W2032482650 abstract "The photoluminescence (PL) from GaAs/AlxGa1−xAs single and multiple quantum well (QW) heterostructures grown by molecular‐beam epitaxy (MBE) has been studied in the temperature range 10<T<300 K. The temperature dependence of the PL peak energy and of the integrated intensity observed under both direct and indirect excitation of the GaAs QWs provides insight into the capture mechanism of photoexcited carriers. The temperature dependence of the QW emission energy follows the band‐gap shrinkage of bulk GaAs. Deviations from this behavior are caused by lateral monolayer thickness fluctuations of the GaAs quantum well. Under direct excitation the QW luminescence intensity decreases with increasing temperature first due to a partial dissociation of excitons and finally due to thermally activated nonradiative centers. Free carriers generated in the AlxGa1−xAs barrier layers under indirect excitation diffuse rapidly into the GaAs well where they recombine radiatively. This diffusion is enhanced with the increase of temperature. A simple model allows the quantitative description of this diffusion process and of the quantum efficiency of the GaAs quantum well as a function of temperature. In the calculation of the temperature dependence of the luminescence intensity under indirect excitation we use a temperature‐independent radiative recombination term and a temperature‐dependent nonradiative recombination term to interpret the experimental data." @default.
• W2032482650 created "2016-06-24" @default.
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• W2032482650 date "1988-08-01" @default.
• W2032482650 modified "2023-10-01" @default.
• W2032482650 title "Temperature dependence of photoluminescence from GaAs single and multiple quantum‐well heterostructures grown by molecular‐beam epitaxy" @default.
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• W2032482650 doi "https://doi.org/10.1063/1.341862" @default.
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