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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/1251

Title: Comparison of single-layer and bilayer InAs/GaAs quantum dots with a higher InAs coverage
Authors: SENGUPTA, S
SHAH, SY
HALDER, N
CHAKRABARTI, S
Keywords: optical-properties
growth
gaas
islands
thickness
threshold
size
Issue Date: 2010
Publisher: VERSITA
Citation: OPTO-ELECTRONICS REVIEW,18(3)295-299
Abstract: Epitaxially grown self-assembled InAs quantum dots (QDs) have found applications in optoelectronics. Efforts are being made to obtain efficient quantum-dot lasers operating at longer telecommunication wavelengths, specifically 1.3 mu m and 1.55 mu m. This requires narrow emission linewidth from the quantum dots at these wavelengths. In InAs/GaAs single layer quantum dot (SQD) structure, higher InAs monolayer coverage for the QDs gives rise to larger dots emitting at longer wavelengths but results in inhomogeneous dot-size distribution. The bilayer quantum dot (BQD) can be used as an alternative to SQDs, which can emit at longer wavelengths (1.229 mu m at 8 K) with significantly narrow linewidth (similar to 16.7 meV). Here, we compare the properties of single layer and bilayer quantum dots grown with higher InAs monolayer coverage. In the BQD structure, only the top QD layer is covered with increased (3.2 ML) InAs monolayer coverage. The emission line width of our BQD sample is found to be insensitive towards post growth treatments.
URI: http://dx.doi.org/10.2478/s11772-010-1039-2
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14441
http://hdl.handle.net/100/1251
ISSN: 1230-3402
Appears in Collections:Proceedings papers

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