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Proceedings Paper

Influence of structure and defects on the performance of dot-in-well laser structures
Author(s): M. Gutierrez; M. Hopkinson; H. Y. Liu; M. Herrera; D. Gonzalez; R. Garcia
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Paper Abstract

Recent progress in the development of 1.3 mm InAs/InGaAs/GaAs dots-in-a-well (DWELL) laser structures has led to efficient CW room temperature laser operation with low current thresholds. However, present devices suffer from non-ideal temperature characteristics due to gain saturation, consequence of the finite dot density and carrier escape due to the small energy separation between the quantum dot (QD) ground and first-excited states. In order to improve device performance, we have examined methods to increase the QD quality and density. In these studies, we have examined the effect of different growth parameters which strongly modify the InAs QDs structure such as temperature and thickness of barrier layers and thickness and composition of the well. Analysis by Transmission Electron Microscopy (TEM), Photoluminescence (PL) and atomic force microscopy (AFM) have identified the presence of defects arising from the complex interaction of QDs, which propagate through the structure into the upper regions being the primary cause of the poor electronic device characteristics. The use of optimized growth has allowed, however, the fabrication of a defect free five layer-stacked structure with record low threshold current density.

Paper Details

Date Published: 7 July 2005
PDF: 12 pages
Proc. SPIE 5840, Photonic Materials, Devices, and Applications, (7 July 2005); doi: 10.1117/12.608955
Show Author Affiliations
M. Gutierrez, Univ. de Cadiz (Spain)
M. Hopkinson, Univ. of Sheffield (United Kingdom)
H. Y. Liu, Univ. of Sheffield (United Kingdom)
M. Herrera, Univ. de Cadiz (Spain)
D. Gonzalez, Univ. de Cadiz (Spain)
R. Garcia, Univ. de Cadiz (Spain)

Published in SPIE Proceedings Vol. 5840:
Photonic Materials, Devices, and Applications
Goncal Badenes; Derek Abbott; Ali Serpenguzel, Editor(s)

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