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

0433914 - FZÚ 2015 CH eng A - Abstract
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.
International Conference on Metalorganic Vapor Phase Epitaxy /17./. Lausanne: École Polytechnique Fédérale de Lausanne, 2014 - (Kapon, E.; Rudra, A.). s. 14-14
[International Conference on Metalorganic Vapor Phase Epitaxy /17./. 13.07.2014-18.07.2014, Lausanne]
R&D Projects: GA ČR GA13-15286S
Institutional support: RVO:68378271
Keywords : InAs quantum dots * GaAsSb layer * photocurrent * long emission wavelength * MOVPE
Subject RIV: BM - Solid Matter Physics ; Magnetism

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/11104/0238091