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Title: | Photoluminescence studies of carrier dynamics in (indium(x),aluminum(x)) gallium(1-x) arsenic/gallium arsenide quantum well structures |
Author(s): | Griffiths, Christopher Owen John |
Doctoral Committee Chair(s): | Klein, Miles V. |
Department / Program: | Physics |
Discipline: | Physics |
Degree Granting Institution: | University of Illinois at Urbana-Champaign |
Degree: | Ph.D. |
Genre: | Dissertation |
Subject(s): | Physics, Condensed Matter |
Abstract: | This thesis discusses carrier dynamics of III-V semiconductor quantum well structures probed by photoluminescence techniques in In$\sb{\rm x}$Ga$\sb{\rm 1-x}$As/GaAs and Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As/GaAs quantum well systems. Photoluminescence is a useful nondestructive probe of direct-gap quantum structures because the exciton population responsible for the measured luminescence is sensitive to well width, alloy composition, strain (in lattice-mismatched structures), and interface roughness. Continuous wave (cw) and time-resolved photoluminescence, and photoluminescence excitation (PLE) measurements were used to gain insight into the physics of GaAs alloy quantum structures. The strain study in Chapter 4 measured the strain in individual quantum wells (within In$\sb{\rm x}$Ga$\sb{\rm 1-x}$As/GaAs multiquantum well samples) by analyzing excitonic luminescence as a function of incident laser energy. These results led to the equilibrium strain model which describes strain due to lattice-mismatch being shared between well and barrier layers in strain-relaxed multiquantum well structures. The small feature study of Chapter 5 investigates the presence of an absorption dip in the photoluminescence spectra of an In$\sb{0.10}$Ga$\sb{0.90}$As single quantum well and five quantum well sample. The dip is explained by fast relaxation of mobile excitons from the barrier material into the quantum well layer. Chapter 6 investigates the effect of interface roughness on tunneling times between narrow well and wide well in Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As/GaAs asymmetric coupled quantum well structures. |
Issue Date: | 1994 |
Type: | Text |
Language: | English |
URI: | http://hdl.handle.net/2142/23283 |
Rights Information: | Copyright 1994 Griffiths, Christopher Owen John |
Date Available in IDEALS: | 2011-05-07 |
Identifier in Online Catalog: | AAI9512375 |
OCLC Identifier: | (UMI)AAI9512375 |
This item appears in the following Collection(s)
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Dissertations and Theses - Physics
Dissertations in Physics -
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois