Fully relaxed low-mismatched InAlAs layer on an InP substrate by using a two step buffer
Résumé
The strain relaxation in low mismatched InxAl1−xAs layers has been studied by triple axis x-ray diffraction, transmission electron microscopy, and photoluminescence. Using a two step buffer, a fully relaxed top layer has been grown by adapting the composition and thickness of a first “strained layer.” The threading dislocation density in the top layer is below 106 /cm2 and strain is relaxed at
the substrate/first layer interface by misfit dislocations. This scheme is a promising method to limit the thickness of buffer layers and obtain fully relaxed pseudosubstrates
Origine : Fichiers éditeurs autorisés sur une archive ouverte