Search for dissertations about: "lattice-mismatch"

Showing result 1 - 5 of 34 swedish dissertations containing the word lattice-mismatch.

  2. 1. Control of Defects and Subgrains in Epitaxial Perovskite Thin Films

    Author : Lars Ryen; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; thin film evolution; La0.70Ba0.30MnO3; epitaxial perovskite films; Keywords: TEM; dielectrics; EELS; SrTiO3; YBa2Cu3O7-x; superconductors; colossal magnetoresistance;

    Abstract : This work concerns the microstructure of epitaxial (001) perovskite thin films, studied by transmission electron microscopy (TEM), in particular high resolution TEM, electron energy-loss spectroscopy (EELS), and energy dispersive x-ray analysis. The perovskites exhibit interesting superconducting, dielectric, and magnetic properties. READ MORE

  4. 2. Order and interfaces in epitaxial heterostructures : Structure and magnetism

    Author : Anna L. Ravensburg; Vassilios Kapaklis; Björgvin Hjörvarsson; Gunnar K. Pálsson; Martina Müller; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The work in this dissertation is devoted to investigating order and interfaces in epitaxial heterostructures. To achieve that the software tool box GenL was developed for simulating and fitting x-ray diffraction patterns from epitaxial thin films, which is used to access structural information on the length scales of interfaces and atomic bonds. READ MORE

  5. 3. Epitaxial III-V/Si heterojunctions for photonic devices

    Author : Giriprasanth Omanakuttan; Sebastian Lourdudoss; Yanting Sun; Harri Lipsanen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; epitaxy; heterojunction; III-V on Si integration; solar cell; Fysik; Physics;

    Abstract : Monolithic integration of III-V materials on silicon is of great interest for efficient electronic-photonic integrated devices and multijunction solar cells on silicon. However, defect formation in the heteroepitaxial layers due to lattice mismatch, thermal mismatch, and polarity mismatch makes it a great challenge. READ MORE

  6. 4. Strain Mapping of Single Nanowires using Nano X-ray Diffraction

    Author : Susanna Hammarberg; NanoLund: Centre for Nanoscience; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Nanotrådar; X-ray Diffraction; Strain mapping; XRF; III-V nanowire; perovskite nanowires; Diffraction; Nanowires; Strain mapping; XRD; XRF; MAX IV;

    Abstract : Nanowires are explored as basic components for a large range of electronic devices. The nanowire format offersseveral benefits, including reduced material consumption and increased potential for combining materials to formnew novel heterostructures. READ MORE

  7. 5. Optical Studies of Polytypism in GaAs Nanowires

    Author : Neimantas Vainorius; NanoLund: Centre for Nanoscience; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Photoluminescence; Raman scattering; Polytypism; Quantum confinement; GaAs nanowires; Fysicumarkivet A:2017:Vainorius;

    Abstract : Semiconductor nanowires are often regarded as having potential to be building blocks for novel applications. Their geometry allows defect-free combinations of materials that have a high degree of lattice mismatch. III-V semiconductor nanowires can also be grown in the wurtzite crystal phase, which is not stable in bulk material or thin films. READ MORE