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Meeting Materials Science & Technology 2013
Symposium Semiconductor Heterostructures: Theory, Growth, Characterization, and Device Applications
Presentation Title Structure and Composition Peculiarities of GaN/AlN Multiple Quantum Wells and GeSi Quantum Rings by EXAFS Spectroscopy
Author(s) Simon Erenburg, Svetlana Trubina, Konstantin Zhuravlev, Timur Malin, Anatolii Dvurechenskii
On-Site Speaker (Planned) Simon Erenburg
Abstract Scope EXAFS (Extended X-ray Absorption Fine Structure) above the GaK and GeK edge have been used to study the local structure of heterointerfaces in Ge/Si and GaN/AlN structures grown by molecular beam epitaxy. Thickness of AlN and GaN layers in MQWs (multiple quantum wells) were evaluated using HRTEM, X-ray diffraction and Raman- spectroscopy. The Ga-Ga interatomic distance in MQWs is lower than that in the bulk GaN due to elastic compression of GaN layers in MQWs. The Ga-Al interatomic distance in thick MQWs is too long (about 0.1 Angstrom longer than typical values for AlGaN alloys). An heterointerfaces intermixing degree depends on total thickness of MQWs. It was found for Ge/Si QRs (quantum rings) that in the first priming phase of growth Ge atoms concentration is ≈ 25%. With further growth (applying the base layers) Ge concentration increases up to 35-45%, depending on the temperature of deposition (610 - 550 C).
Proceedings Inclusion? Planned: Journal of Electronic Materials

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Dislocation Compensation in Ungraded ZnSySe1-y/GaAs (001) Multilayer Heterostructures
Dislocation Geometry and Equilibrium Strain Relaxation in InGaN/GaN (0001) Heterostructures
Electrical and Optical Properties of Doped and Undoped Silicon Nanowires for Photovoltoic Application
First-principles Theoretical Investigation of Schottky-barrier Height at RhSi/Si(001) Interface
Growth and Microcharacterization of Strain Engineered Compositional Grades for Lattice-mismatched, Semiconductor Nanostructures
Half-loop Model for Equilibrium Strain Relaxation in Zinc Blende Semiconductor Heterostructures
Metamorphic Antimony-based Heterostructures for Infrared Photonics
Mosaic Crystal Model for Dynamical X-ray Diffraction from InGaAs/GaAs (001) Metamorphic Heterostructures
Size Distribution, Imaging and Growth Mechanisms of Self-assembled InAs Quantum Wires on Vicinal Substrates
Unravel High Temperature Gas Sensing Mechanism of (La,Sr)FeO3(LSFO) / Ga2O3 Heterojunction Nanorods Array

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