Sökning: "crystal phase heterostructure"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden crystal phase heterostructure.

  1. 1. Optical studies of crystal phase heterostructures

    Författare :Irene Geijselaers; NanoLund: Centre for Nanoscience; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; III-V semiconductor nanowires; photoluminescence; photoluminescence excitation; polytype; crystal phase heterostructure; InP; GaAs; wurtzite; Fysicumarkivet A:2021:Geijselaers;

    Sammanfattning : III-V semiconductors are commonly used for a variety of optical applications, such as LED based lights and solar sells. Most III-V semiconductors, such as GaAs and InP, exhibit the zinc-blende (zb) crystal structure, but in the form of nanowires it is also possible to create them in the wurtzite (wz) crystal structure. LÄS MER

  3. 2. Photoluminescence Studies of Polytype Heterostructured InP Nanostructures

    Författare :Asmita Jash; NanoLund: Centre for Nanoscience; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; III-V semiconductor; Photoluminescence; time-resolved photoluminescence TRPL ; polytype; crystal phase heterostructure; InP; wurtzite WZ ; zincblende; Indirect Exciton;

    Sammanfattning : The interface between two semiconductors significantly influences their optical and electronic properties. In contrast to traditional material heterostructures, polytype heterostructures between wurtzite (wz) and zincblende (zb) segments in homomaterial InP nanostructures exhibit sharp interfaces with minimal strain. LÄS MER

  4. 3. Improving Thermoelectric Properties of Inorganic Clathrates by Atomic and Microscale Structure Engineering

    Författare :Yifei Zhang; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Crystal structure; Thermoelectrics; Chemical ordering; Microstructure; Clathrates; Thermal properties; Electrical transport properties;

    Sammanfattning : As more countries are aiming for a carbon-neutral economy, technologies that utilize renewable energies are increasingly being considered. Thermoelectric materials enable the direct conversion between a thermal gradient and an electrical potential gradient, and are thus exploited for applications such as waste heat recovery. LÄS MER

  5. 4. Charge and Spin Transport in Parallel-Coupled Quantum Dots in Nanowires

    Författare :Malin Nilsson; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:2018:Nilsson;

    Sammanfattning : This thesis explores crystal-phase engineering of nanowires to fabricate advanced quantum structures for charge and spin transport studies. Quantum dots formed by crystal-phase tuning during epitaxial growth of InAs nanowires were used as a starting point to realize and electrically characterize two different types of parallel-coupled quantum dots; electron-hole quantum dots and electron-electron quantum dots. LÄS MER

  7. 5. Atomic Scale Characterization of III-V Nanowire Surfaces

    Författare :Johan Knutsson; NanoLund: Centre for Nanoscience; []
    Nyckelord :III–V semiconductor materials; nanowire; surface; scanning tunneling microscopy; wurtzite; zinc blende; scanning tunneling spectroscopy; Fysicumarkivet A:2017:Knutsson;

    Sammanfattning : This dissertation focus on the atomic-scale characterization of the surface properties and electronic structure of III–V semiconductor nanowires (NWs). Since the early 2000s, the fabrication and characterization of III–V NWs has been a very significant topic within material science due to their potential for applications in lighting, energy harvesting, and electronics. LÄS MER