Role of GaAs bounding layers in improving OMVPE growth and performance of strained-layer inGaAs/AIGaAs quantum-well diode lasers |
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Authors: | C A Wang H K Choi |
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Affiliation: | (1) Lincoln Laboratory, Massachusetts Institute of Technology Lexington, 02173-9108, Massachusetts |
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Abstract: | In the growth of organometallic vapor phase epitaxy of InGaAs/AIGaAs single-quan-tum-well heterostructures for strained-layer
diode lasers, the growth temperature is 100 to 200° C lower for the InGaAs quantum-well layer than for the AlGaAs cladding
layers. Earlier studies showed that laser performance is greatly improved by sandwiching the InGaAs layer between lower and
upper GaAs bounding layers that are grown during the times before and after InGaAs growth when the substrate temperature is
decreased and increased, respectively. In this investigation, it has been found that laser performance is influenced mainly
by the upper bounding layer rather than the lower one. By using Auger analysis in combination with Ar-ion sputtering to determine
the composition depth profile of In0.2Ga0.8As/GaAs test structures layer without AlGaAs layers, it has been shown that the role of the upper bounding layer is to prevent
the evaporation of In from the InGaAs quantum-well layer during the interval before the deposition of the upper AlGaAs cladding
layer. |
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Keywords: | OMVPE InGaAs/GaAs strained layer quantum-well diode laser |
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