University of Illinois Urbana-Champaign

Optical studies of III-V quantum wires grown by strain induced lateral ordering (SILO) process

Dua, Praveen

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Description

Title
Optical studies of III-V quantum wires grown by strain induced lateral ordering (SILO) process
Author(s)
Dua, Praveen
Issue Date
1997
Doctoral Committee Chair(s)
Cooper, S. Lance
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • quantum wires
  • strain induced lateral ordering
Language
en
Abstract
A host of optical techniques have been utilized to carefully study the quantum wires grown via strain induced lateral ordering (SILO) which is a bulk thermodynamics driven self-ordering process. Fourier transform photoluminescence (FTPL) measurements have been employed to study the polarization anisotropy in the emission from these structures. Photoluminescence power dependence and photoluminescence excitation spectroscopy is used along with the FTPL results to confirm the formation of quantum wires by the SILO process and to assess the presence of strain and the extent of Cu-Pt type ordering in these multiple quantum wire arrays. Evolution of the entire luminescence band after excitation is studied with the time-resolved photoluminescence measurements. The interface defect density in SILO wires is found to be considerably smaller than that of the wires fabricated with conventional techniques. Recombination is dominated by exciton recombination up to the room temperature. Carrier relaxation in quantum wires is studied for the intermediate temperature range. A characterization technique is developed to estimate the extent and shape of the spontaneously created composition modulation. The technique, based on resonant Raman spectroscopy, is general and can be utilized to map out composition regions in any semiconductor microstructure. Computer simulations were performed to confirm the validity of this technique.
Type of Resource
text
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http://hdl.handle.net/2142/30696
Copyright and License Information
©1997 Dua

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