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MOVPE prepared InAs/GaAs quantum dots covered by GaAsSb layer with long wavelength emission at 1.8 µm

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    0448593 - FZU-D 2016 RIV NL eng J - Journal Article
    Zíková, Markéta - Hospodková, Alice - Pangrác, Jiří - Oswald, Jiří - Krčil, Pavel - Hulicius, Eduard - Komninou, Ph. - Kioseoglou, J.
    MOVPE prepared InAs/GaAs quantum dots covered by GaAsSb layer with long wavelength emission at 1.8 µm.
    Journal of Crystal Growth. Roč. 414, Mar (2015), 167-171. ISSN 0022-0248
    R&D Projects: GA ČR GA13-15286S; GA MŠk(CZ) LM2011026
    Institutional support: RVO:68378271
    Keywords : long emission wavelength * photocurrent * InAs quantum dots * MOVPE * GaAsSb layer
    Subject RIV: BM - Solid Matter Physics ; Magnetism
    Impact factor: 1.462, year: 2015

    Preparation and properties of InAs/GaAs quantum dots prepared by the MOVPE covered by GaAsSb SRL with extremely long emission wavelength at 1.8 µm is presented. The prolongation of the emission wavelength was achieved by the introduction of GaAsSb SRL with Sb content of about 30% in the solid phase. The high Sb concentration in the SRL causes the preservation of QD size, it prolongs the PL wavelength. Furthermore, high content of antimony leads to a creation of type II heterostructure for which a red shift of the PL wavelength and decrease of the PL intensity is typical. Low PL intensity may complicate light emitting applications; however, fast separation of carriers in the type II structure is an advantage for detector or solar cell application, especially with the long working wavelength. With respect to the perspective application of this structure, the photocurrent measurement was chosen as the complementary characterization method.
    Permanent Link: http://hdl.handle.net/11104/0250242