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Effects of ex situ annealing on quaternary alloy (InAlGaAs) capped InAs/GaAs quantum dot heterostructures on optimization of optoelectronic and structural properties with variation in growth rate, barrier thickness, and seed quantum dot monolayer coverage

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Title Effects of ex situ annealing on quaternary alloy (InAlGaAs) capped InAs/GaAs quantum dot heterostructures on optimization of optoelectronic and structural properties with variation in growth rate, barrier thickness, and seed quantum dot monolayer coverage
 
Creator MANDAL, A
VERMA, U
CHAKRABARTI, S
 
Subject Multilayers
Quantum dots
Monolayer
Annealing
Epitaxial growth
Electron microscopy
Luminescence
CHEMICAL-VAPOR-DEPOSITION
INFRARED PHOTODETECTOR
GAAS
TEMPERATURE
PHOTOLUMINESCENCE
OPERATION
DENSITY
LASERS
 
Description Self-assembled InAs/GaAs multilayer quantum dots (MQDs) have been widely investigated for their potential application in optoelectronic applications such as lasers and photovoltaic devices. This study focuses on analyzing the use of annealing to manipulate the optoelectronic and physical properties of 10-layer InAs/GaAs MQDs. MQD growth rate and parameters such as the capping layer thickness of the InAlGaAs and GaAs capping combination and monolayer coverage of the seed quantum dot (QD) layer were varied. Increase in the number of QD families for one 700 degrees C annealed sample (A2) showed the effects of growth rate and post-growth annealing. Other two samples (B2 and B3) showed the importance of thick combination capping of InAlGaAs and GaAs in an InAs/GaAs MQD system. Samples B2 and B3 revealed an optimized set of characteristics suitable for thermal stability, as the samples were stable even at 750 degrees C annealing, making them suitable for application in communication lasers. (C) 2013 Elsevier Ltd. All rights reserved.
 
Publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
 
Date 2014-10-15T16:54:44Z
2014-10-15T16:54:44Z
2013
 
Type Article
 
Identifier SUPERLATTICES AND MICROSTRUCTURES, 58101-119
http://dx.doi.org/10.1016/j.spmi.2013.03.013
http://dspace.library.iitb.ac.in/jspui/handle/100/15262
 
Language en