Paper Title:
Effects of a InGaAs Strained Layer on Structures and Photoluminescence Characteristics of InAs Quantum Dots
  Abstract

The influences of a thin InGaAs layer grown on GaAs(100) substrate before deposited InAs self-assembled quantum dots(SAQDs) were experimentally investigated. Scanning electronic microscope (SEM) measurements show that the InGaAs strained layer may release the strain between wetting layer and QDs, and then enlarge size of QDs. When the thickness of InAs layer is small, the QDs are chained. Temperature dependent photoluminescence (TDPL) measurements show that the PL peaks of InAs QDs with In0.1Ga0.9As show much more red shift compared with the QDs directly deposited on GaAs matrix, and PL integral intensity enhances as T rises from 50K to 90K. We attribute this enhancement to the small potential barrier between WL and QDs produced by the InGaAs stained layer.

  Info
Periodical
Advanced Materials Research (Volumes 148-149)
Edited by
Xianghua Liu, Zhengyi Jiang and Jingtao Han
Pages
897-902
DOI
10.4028/www.scientific.net/AMR.148-149.897
Citation
J. M. Yao, L. M. Kong, S. L. Wang, "Effects of a InGaAs Strained Layer on Structures and Photoluminescence Characteristics of InAs Quantum Dots", Advanced Materials Research, Vols. 148-149, pp. 897-902, 2011
Online since
October 2010
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