Sökning: "polytypism"
Visar resultat 1 - 5 av 7 avhandlingar innehållade ordet polytypism.
1. Optical Studies of Polytypism in GaAs Nanowires
Sammanfattning : 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. LÄS MER
2. The Crystal Structure of III-V Semiconductor Nanowires: Growth and Characterization
Sammanfattning : This thesis concerns growth and characterization of gold-particle seeded nanowires of III-V semiconductor materials (III-V NWs). The nanowires were grown using metal-organic vapour phase epitaxy (MOVPE) and characterized by various microscopy techniques. LÄS MER
3. Transmission Electron Microscopy of Nanowires: Influence of Doping and Etching on Polytypism in InP
Sammanfattning : Semiconductor nanowires have many properties which makes them interesting for future electronic devices. The fact that they have very small diameters allow them to combine different III-V materials into heterostructures, and makes it possible to grow them on Si substrates which are the basis of nearly all current semiconductor technology. LÄS MER
4. Thermodynamic modelling of composition and crystal structure of ternary nanowires
Sammanfattning : An analytic expression for the composition of a ternary solid material nucleating from a quaternary liquid melt has been derived. This theory has been applied to Au-catalyzed and self-catalyzed, nucleation limited VLS growth of ternary III-V nanowires. LÄS MER
5. CVD growth of SiC for high-power and high-frequency applications
Sammanfattning : Silicon Carbide (SiC) is a wide bandgap semiconductor that has attracted a lot of interest for electronic applications due to its high thermal conductivity, high saturation electron drift velocity and high critical electric field strength. In recent years commercial SiC devices have started to make their way into high and medium voltage applications. LÄS MER