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Controlling alloy composition of InAsP self-assembled quantum dots embedded in GaAs

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Controlling alloy composition of InAsP self-assembled quantum dots embedded in GaAs

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Título Controlling alloy composition of InAsP self-assembled quantum dots embedded in GaAs
Autor Maltez, Rogério Luis
Ribeiro, Euripedes
Carvalho Junior, Wilson
Ugarte, Daniel
Medeiros-Ribeiro, Gilberto
Abstract We report on the growth of quantum dot (QD) layers of InAsP alloys buried in GaAs by low-pressure metalorganic chemical vapor deposition. Ternary QDs were obtained by the addition of a PH3 flux during the InAs QD growth, exhibiting recombination energies lying between those of InAs and InP QDs. The electronic properties of these QDs, as evaluated by photoluminescence spectroscopy, could be tailored by varying both the growth rate and the PH3 flux for a constant AsH3 flux. The morphology of these QDs was investigated by transmission electron microscopy from which the formation of an InAsP ternary alloy QDs was inferred. Based on electron microscopy results, the fundamental role of As incorporation on the morphology of and on the defect nucleation associated to InAsP QDs could be then evaluated. From this optical–structural combined analysis, we were able to identify the growth conditions that produce good quality InAsP QDs embedded in GaAs.
Contido em Journal of applied physics. Melville. Vol. 94, no. 5 (Sept. 2003), p. 3051-3056
Assunto Arseneto de galio
Compostos de indio
Fotoluminescencia
Microscopia eletronica de transmissao
Mocvd
Nucleacao
Semicondutores iii-v
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/95826
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