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- W2012046162 abstract "Compositionally step-graded ((Al)Ga)xIn1−xP (x=0.52–0.22) buffers and following In0.3Ga0.7As cap layers are grown by metal-organic chemical vapor deposition on (001) GaAs substrates with different miscuts toward (111)A. The tilt with respect to the substrate and phase separation in GaxIn1−xP buffer layers are investigated by x-ray reciprocal space mapping and transmission electron microscopy. It is found that a large negative tilt is generated in the [110] direction due to the preferential nucleation of α dislocations with tilt component along [001¯], and that a positive tilt in the [11¯0] direction is introduced by the wavy surface undulations along [11¯0] when growing the GaxIn1−xP buffer and enhanced by preferential glide of the existing β dislocations in the (1¯11) slip plane during the growth of the In0.3Ga0.7As cap layer. The phase separation in the GaxIn1−xP buffer layer, acting as the main source of threading dislocations in the In0.3Ga0.7As cap layer, has been suppressed by increasing the number of steps in the buffer layer and thickness and utilizing (Al0.3Ga0.7)0.22In0.78P layer as the top buffer layer. Finally, In0.3Ga0.7As layers with a low threading dislocation density are obtained on the top AlGaInP layer due to the lattice hardening effect and this improvement is confirmed by the photoluminescence measurements." @default.
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- W2012046162 date "2013-02-01" @default.
- W2012046162 modified "2023-09-27" @default.
- W2012046162 title "Tilt generation and phase separation in metamorphic GaInP buffers grown on GaAs substrates by metal-organic chemical vapor deposition" @default.
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- W2012046162 doi "https://doi.org/10.1016/j.jcrysgro.2012.11.025" @default.
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