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• W2020996619 abstract "We report on the performance of a valved As cracker source and compare the qualities of GaAs, AlGaAs, and strained InGaAs quantum-well (QW) lasers grown with As2 and As4 species. By varying the valve position, the As flux can be varied rapidly and controllably without thermal adjustment. The furnace is ruggedly designed to provide satisfactory mechanical and thermal performance. For cracking temperatures (Tcr) ≥ 775°C where As2 flux predominates, the undoped GaAs is n-type and the value of electron concentration (n) increases with increasing Tcr. The best cracker cell performance is obtained at Tcr = 825°C, which gives n≈2x1014 cm−3 and μ77K=122,000 cm2 V−1 s−1 in undoped GaAs. For Tcr ≤ 750°C, the undoped GaAs is p-type and the furnace operates essentially in As4 mode. The photoluminescence spectrum is typical of high quality GaAs grown with As4. Deep level transient spectroscopy does not detect any electron deep levels in As2-GaAs. Although strained InGaAs QW lasers grown using As2 at a substrate temperature as low as 570°C have a lower threshold current density, they also exhibit a 10–25% lower differential quantum efficiency as compared to the As4 counterpart in which the AlGaAs cladding layers are grown at ∼ 700°C." @default.
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• W2020996619 date "1993-02-01" @default.
• W2020996619 modified "2023-10-18" @default.
• W2020996619 title "Performance of a valved arsenic cracker source for MBE growth" @default.
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• W2020996619 doi "https://doi.org/10.1016/0022-0248(93)90802-4" @default.
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