Effect of Modified Growth Method on the Structural and Optical Properties of InAs/GaAs Quantum Dots for Controlling Density

Title
Effect of Modified Growth Method on the Structural and Optical Properties of InAs/GaAs Quantum Dots for Controlling Density
Authors
유성필조남기임주영이혜진최원준송진동이정일이용탁
Keywords
InAs; Quantum dots; low density
Issue Date
2009-10
Publisher
Japanese Journal of Applied Physics, Part 1- Regular Papers
Citation
VOL 48, 095506-1-095506-5
Abstract
We introduce a thermal treatment, namely, a growth technique to form low-density quantum dots (QDs) with homogeneous InAs deposition, and study the structural and optical properties of InAs/GaAs QDs during the formation of dots by the thermal treatment. The structural and optical properties are studied by atomic force microscopy and photoluminescence (PL). We achieve a wide range of dot densities from 1010 to 106 per cm2 by adjusting the thermal treatment temperature. The uniformity of InAs dots improves as the thermal treatment temperature increases. Comparing PL spectra with those in the literature, we confirm that the dots in this work are not QDs but small quasi-three-dimensional (Q3D) clusters. Q3D clusters are left after the thermal treatment. This behavior of Q3D is different from that of the QDs reported in the literature. We conclude that three phenomena occur during the thermal treatment: 1) In segregation, 2) In reevaporation, and 3) the intermixing of InAs. As a result, we conclude that the thermal treatment is a very useful method for controlling the dot density.
URI
http://pubs.kist.re.kr/handle/201004/35958
ISSN
0021-4922
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE