Sökning: "Heterostructure"

Visar resultat 6 - 10 av 24 uppsatser innehållade ordet Heterostructure.

  1. 6. Mechanical properties of SiC nanowires with polytypes

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Anders Vesti; [2019]
    Nyckelord :atomistic modeling; nanowires; molecular dynamics; simulation; SiC; silicon carbide; fracture behavior; nanomechanics; Physics and Astronomy;

    Sammanfattning : In this report, we model the mechanical properties and fracture behavior of SiC nanowires with different polytypes using Molecular Dynamics (MD) simulations. The mechanical properties investigated are the Young’s modulus, the maximum tensile stress and the fracture strain. The three polytype tested are SiC (3C), (2H) and (4H). LÄS MER

  3. 7. Finite element modelling of strained nanowire heterostructures

    Kandidat-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Alexander Grape Wyke; [2019]
    Nyckelord :Strain; nanowire; heterostructure; physics; nanophysics; COMSOL; simulation; lattice; Physics and Astronomy;

    Sammanfattning : When two materials with different lattice constants are grown together, this generates stress between them, and therefore strain. This strain causes them to have different thermal and electrical properties, and this is especially important on the nanoscale where changes have large impacts. LÄS MER

  4. 8. Electron Assisted Growth of Graphene atop Ir(111) supported Hexagonal Boron Nitride

    Kandidat-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Lassi Linnala; [2019]
    Nyckelord :Two-dimensional materials; Two-dimensional heterostructures; Graphene; hexagonal Boron Nitride; STM; LEED; Physics and Astronomy;

    Sammanfattning : Vertical heterostructures between graphene (Gr) and hexagonal boron nitride (hBN) have attracted a great deal of interest, due to their potential applications in the semiconductor industry as new and superior transistor materials. The direct growth of the heterostucture still remains challenging and in this bachelor thesis, I report a novel electron assisted growth technique, which is used to attempt to grow Gr atop hBN atop an Ir(111) single crystal surface. LÄS MER

  5. 9. Modelling of injection of electrons by low-dimensional nanowire into a reservoir

    Master-uppsats, Linköpings universitet/Teoretisk Fysik

    Författare :Ivan Yakymenko; [2018]
    Nyckelord :quantum wire; magnetic electron focusing; electron flow; electron injector and detector; semiconductor heterostructure; two-dimensional electron gas;

    Sammanfattning : High-mobility two-dimensional electron gas (2DEG) which resides at the interface between GaAs and AlGaAs layered semiconductors has been used experimentally and theoretically to study ballistic electron transport. The present project is motivated by recent experiments in magnetic electron focusing. LÄS MER

  7. 10. Electro-Optical Characterization of Passivated InAsP/InP Quantum Discs-in-Nanowire Heterostructures

    Magister-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Samareh Kordi Jazi; [2018]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Semiconductor nanowires, with their quasi one-dimension geometry, inherently provide strain relaxation for heterogeneous integration and also strong light mode confinement. Nanowire-based photonic devices have also been demonstrated to offer significantly enhanced quantum efficiency, gain and reduced noise. LÄS MER